Nokia 4A0-105

Nokia Virtual Private LAN Services

Version: 5.0
 Nokia 4A0-105 Exam
Topic 1, Volume A

QUESTION NO: 1

Which of the following technologies allows for two explicit VLAN tags to be received from a
customer device?

A.
RSVP-TE

B.
SP-VLAN

C.
QinQ

D.
Dot1Q

Answer: C
Explanation:

QUESTION NO: 2

What is the SA in the Ethernet frame used for by a layer 2 switch?

A.
MAC learning

B.
SA filtering

C.
Routing table population

D.
Frame forwarding

Answer: A
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 3

What are the limitations of a traditional layer 2 switch? (Choose 3}

A.
Isolates collision domains.

B.
Requires layer 2 loop prevention.

C.
Slow response to topology changes.

D.
Limited to 4094 vlans per switch.

E.
Increased flooding.

Answer: B,C,D
Explanation:

QUESTION NO: 4

Which of the following statements about the VC-ID is false?

A.
The vc-id is signaled in the control plane.

B.
The vc-id is part of the data plane encapsulation.

C.
There is a vc-id to vc-label mapping.

D.
The vc-id has point to point significance.

Answer: B
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 5

Assuming TLDP and RSVP are both being used in an MPLS network core which of the following
statements is true?

A.
TLDP is used to create the inner label, RSVP is used to create the outer label.

B.
TLDP is used to create the outer label, RSVP is used to create the inner label.

C.
TLDP and RSVP cannot be used in the same network since they both provide the same label.

D.
When RSVP is used, TLDP must be disabled and static vc labels should be used.

E.
TLDP and RSVP can be used to create either labels based on how they are configured.

Answer: A
Explanation:

QUESTION NO: 6

Fill in the blank for this next sentence. Flooded traffic received on any ____________ in the
service is replicated to other spoke SDPs and SAPs and not transmitted on any mesh SDPs.

A.
Spoke SDP

B.
Mesh SDP

C.
Either (a) or (b) will make this sentence true.

D.
Neither (a) nor (b) will make this sentence true.

Answer: B
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 7

Port 1/1/1 has been configured as an access port with QinQ encapsulation. Which of the following
three statements are true for ingress traffic assuming default configuration? (Choose 3)

A.
sap 1/1/1:*.0 is a valid sap id.

B.
sap 1/1/1:100* will accept frames with a single tag of 100.

C.
sap 1/1/1:200* will strip the top tag of 200 and the bottom tag will be transparently passed.

D.
sap 1/1/1:0* will accept all untagged frames.

E.
sap 1/1/1:0* will accept any tagged frames.

Answer: B,C,D
Explanation:

QUESTION NO: 8

Which of the following statements relating to VPLS is false?

A.
A VPLS is a multipoint Layer 2 service.

B.
A VPLS allows multiple customer sites to be connected in a single bridged domain.

C.
A VPLS on a single node requires a SDP.

D.
With an IP/MPLS infrastructure, service providers can provide multiple VPLS services over a
common IP/MPLS infrastructure.

E.
The VPLS switches traffic based on MAC address associated to the appropriate SAP.

Answer: C

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 Nokia 4A0-105 Exam
Explanation:

QUESTION NO: 9

Click on the exhibit below.

Assume the port on CE-A is sending two tags, a top tag of 100 and a bottom tag of 500. PE-A is
configured with a SAP id of 1/1/1:100.*. How should PE-B be configured if CE-B is expecting a top
tag of 200 and a bottom tag of 500?

A.
PE-B will require a SAP id of "sap 1/1/1:500*".

B.
PE-B will require a SAP id of "sap 1/1/1:100*".

C.
PE-B will require a SAP id of "sap 1/1/1:500.200".

D.
PE-B will require a SAP id of "sap 1/1/1:200*".

Answer: D
Explanation:

QUESTION NO: 10

Which of the following statements is false?

A.
VPLS is a bridged LAN service.

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 Nokia 4A0-105 Exam
B.
VPLS provides L2 VPN services to CEs.

C.
VPLS is a point-to-point service where CEs are presented with point-to-point virtual circuits.

D.
CEs that are members of the same VPLS service instance communicate with each other as if they
are connected via a bridged LAN.

Answer: C
Explanation:

QUESTION NO: 11

Click on the exhibit below.

The following VPLS services and SAPs have been configured. Which of the following statements
is true?

A.
All untagged frames will be dropped.

B.
The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated
in VPLS 3.

C.
All frames with more than one tag will be dropped.

D.
The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.

E.
The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.
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 Nokia 4A0-105 Exam
Answer: E
Explanation:

QUESTION NO: 12

Click on the exhibit below.

If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the
VPLS?

A.
Only R4 will be reachable through the VPLS.

B.
All devices will be reachable through the VPLS.

C.
R4 and R3 will remain reachable.

D.
No devices will be reachable.

Answer: A
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Explanation:

QUESTION NO: 13

What is the default service-mtu for a VPLS service?

A.
1500

B.
1514

C.
1518

D.
It depends on the access port MTU.

E.
It depends on the network port MTU.

Answer: B
Explanation:

QUESTION NO: 14

Click on the exhibit below.

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 Nokia 4A0-105 Exam

The VPLS service MTU on R2 is 1514 bytes. What must the service MTU be on all other routers
participating in the VPLS?

A.
The service MTU must be equal to or smaller than 1514 bytes.

B.
The service MTU must be 1514 bytes.

C.
The service MTU must be equal to or greater than 1514 bytes.

D.
The service MTU can be any value.

Answer: B
Explanation:

QUESTION NO: 15

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 Nokia 4A0-105 Exam
What is the default fdb size for a VPLS service?

A.
100

B.
1

C.
25

D.
250

Answer: D
Explanation:

QUESTION NO: 16

If the command "disable-learning" has been added at the VPLS level, then MAC entries which
have already been learned will not be aged.

A.
TRUE

B.
FALSE

Answer: B
Explanation:

QUESTION NO: 17

Which OAM tool can be used to dynamically learn the MAC address of a CE device connected to
a SAP within a VPLS service?

A.
oam mac-populate

B.

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 Nokia 4A0-105 Exam
oam mac-ping

C.
oam mac-trace

D.
oam svc-ping

E.
oam cpe-ping

Answer: E
Explanation:

QUESTION NO: 18

During the process of troubleshooting a VPLS problem the "oam mac-purge" command with
"register" option was used to purge a MAC address from the FDB. Which of the following
statements is true?

A.
Relearning of the MAC address that was purged can only be done once customer traffic resumes.

B.
Relearning of the MAC address that was purged can only be done with the "oam mac-populate"
command.

C.
Customer traffic destined to the MAC address that was purged will be dropped until the MAC
address is relearned with the "oam mac-populate" command.

D.
Relearning of the MAC address that was purged can only be done with the "oam mac-register"
command.

Answer: B
Explanation:

QUESTION NO: 19

Click on the exhibit below.

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 Nokia 4A0-105 Exam

The following IP filter has been configured and applied to a SAP in a non-VPLS service. Which of
the following statements is true?

A.
An error will be generated and the configuration will not be allowed.

B.
The filter entry will be ignored and traffic matching the criteria will be forwarded

C.
All traffic matching entry 20 will be dropped.

D.
Traffic matching entry 20 will be forwarded to sdp 100:1.

Answer: C
Explanation:

QUESTION NO: 20

Which of the following statements is true?

A.
Filter Policies can only be applied on egress.

B.
An IP filter can be applied on ingress at the same time a MAC filter is applied on the egress of the
SAP.

C.
Filter Policies can be based on IP, MAC, and VPI/VCI addresses.

D.
Any number of ingress and egress filter policies can be associated with a SAP.
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 Nokia 4A0-105 Exam
E.
An IP filter and a MAC filter can be applied on the ingress SAP at the same time.

F.
None of the above.

Answer: B
Explanation:

QUESTION NO: 21

How is the Primary Bridge chosen in a VPLS?

A.
The PE devices participating in the VPLS mesh run a separate Spanning Tree instance in the
Core. The Primary Bridge is the Root Bridge for the VPLS mesh.

B.
The PE devices participating in the VPLS mesh determine which bridge is closest to Root Bridge.
This bridge becomes the Primary Bridge.

C.
The PE devices participating in the VPLS mesh determine which bridge has the lowest bridge-id.
This bridge becomes the Primary Bridge.

D.
The PE devices participating in the VPLS mesh determine which bridge is the Root Bridge. This
becomes the Primary Bridge.

Answer: B
Explanation:

QUESTION NO: 22

When spanning tree is enabled within a VPLS service and the STP mode is 802.1 D 2004 what
happens if a PVST BPDU is received on a SAP?

A.
Spanning tree will be disabled on the SAP that the PVST BPDU was received on.

B.
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 Nokia 4A0-105 Exam
The SAP that the PVST BPDU was received on will be disabled to prevent loops.

C.
The spanning tree encapsulation will be dynamically changed to PVST on the SAP the PVST
BPDU was received on.

D.
The PVST BPDU will be ignored and 802.1D 2004 BPDUs will continue to be transmitted on the
SAP.

Answer: C
Explanation:

QUESTION NO: 23

Click on the exhibit below.

Which bridge will become the root bridge?

A.
Bridge B

B.
Bridge C

C.
Bridge D

D.
Bridge E

Answer: D
Explanation:

QUESTION NO: 24

Which of the following statements about Spanning Tree Protocol is true?

A.
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 Nokia 4A0-105 Exam
For the switches that are non-root or designated switches, the port with the highest combined cost
to the root is the root port.

B.
In the case where two switches have the same priority, the switch with the lowest MAC address
becomes the root.

C.
The switch port that is the greatest distance from the LAN to the root is the designated port.

D.
All of the above.

Answer: B
Explanation:

QUESTION NO: 25

In Rapid Spanning Tree Protocol, a Backup Port is on the same switch as a Designated Port?

A.
TRUE

B.
FALSE

Answer: A
Explanation:

QUESTION NO: 26

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Based on the output below which of the following statements is true?

A.
This Bridge is furthest from the Root Bridge within the VPLS mesh.

B.
This Bridge is the Root Bridge.

C.
SAP 1/1/1 is an Edge Port.

D.
This Bridge is closest to the Root Bridge within the VPLS mesh.

Answer: D
Explanation:

QUESTION NO: 27

How can one ensure that a specific switch will be select as root in an STP network?

A.
Set the bridge priority to 131071.

B.
Set the bridge priority to 0.

C.
Set the bridge priority to 32768.

D.
Leave the bridge priority as the default.
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 Nokia 4A0-105 Exam
Answer: B
Explanation:

QUESTION NO: 28

In RSTP, an alternate port is on the same switch as a designated Port.

A.
TRUE

B.
FALSE

Answer: B
Explanation:

QUESTION NO: 29

Two management VPLSs have been created. mVPLS 1 and mVPLS 2. Two user VPLS services
exist. uVPLS 10 and uVPLS 20. What command can be used to determine which management
VPLS is managing uVPLS 10?

A.
show stp 10

B.
show service vpls 1 stp

C.
show service id 10 stp

D.
show service id 1 stp or show service id 2 stp

Answer: C
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 30

How do user VPLSs become associated with a management VPLS for redundant spoke-sdp
connections?

A.
The association must be defined in the user VPLS service.

B.
The association is done when the user VPLS is associated with the same sdp-id in the
management VPLS

C.
The association is based on service IDs.

D.
The association is based on customer IDs.

Answer: B
Explanation:

QUESTION NO: 31

Click on the exhibit below.

Based on the output below which of the following statements is true? (Choose 2)

A.
VPLS1500 is a user VPLS.

B.
VPLS 1500 is management VPLS.

C.
Spanning tree BPDUs for the management VPLS are tagged.

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 Nokia 4A0-105 Exam
D.
Spanning tree BPDUs for the management VPLS are untagged.

Answer: A,D
Explanation:

QUESTION NO: 32

If a management VPLS is administratively disabled what will be the status of the associated user
VPLS SAPs?

A.
Regular semantics will apply. It will be as if the SAP doesn't belong to a management VPLS.

B.
All user VPLS SAPs will be disabled/pruned.

C.
It is not possible to administratively disable a management VPLS.

D.
Spanning tree will be automatically enabled on the user VPLS SAPs.

Answer: B
Explanation:

QUESTION NO: 33

MC-LAG is only supported on network ports.

A.
TRUE

B.
FALSE

Answer: B
Explanation:

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 Nokia 4A0-105 Exam

QUESTION NO: 34

Which protocol is used to signal the status of the active links between the PE and the CE in MC-
LAG?

A.
MSTP

B.
MCLAG

C.
LACP

D.
DHCP

E.
A proprietary protocol

Answer: C
Explanation:

QUESTION NO: 35

MC-LAG provides link and node protection from an MDU to 3 or more PE devices.

A.
TRUE

B.
FALSE

Answer: B
Explanation:

QUESTION NO: 36

Click on the exhibit below.

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 Nokia 4A0-105 Exam

The MDU attached to this PE has been configured with active/standby SDP's configuration option
has been configured for the PE to recognize that this SDP is in standby mode?

A.
On the PE the endpoint has been configured with "supress-standby-signalling"

B.
On the PE the endpoint has been configured with "no supress-standby-signalling"

C.
On the MDU the endpoint has been configured with "supress-standby-signalling"

D.
On the MDU the endpoint has been configured with "no supress-standby-signalling1

Answer: D
Explanation:

QUESTION NO: 37

In Active/Standby pseudowires a failed pseudowire has recovered. Under what circumstances will
the active pseudowire revert to the previously failed link?

A.
It will always revert to the previously failed link.

B.
It will never revert to the previously failed link.

C.
It will revert if the precedence of the previously failed link is set to 0 or "primary".

D.
It will revert if the precedence of the previously failed link is lower than the currently active link

Answer: C
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 38

Click on the exhibit below.

Assume there are two VPLS services configured on the MDU. How could load-balancing be
achieved when using Active/Standby pseudowires?

A.
This cannot be done.

B.
Each VPLS will use the same pair of SDP's with the same endpoint configured with the option
"load-balancing 2".

C.
Each VPLS will need their own pair of spoke-SDP's configured. The spoke-sdp's that are to be
active should be configured with the option "precedence primary".

D.
Under the end-point configuration, enable load-balancing 2 and the MDU will load balance
automatically.

Answer: C
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 39

Click on the exhibit below.

Assume PE-1 has a mesh-sdp configured to every PE node in both Metro networks. What could
be done to prevent the bandwidth replication between Metro 1 and Metro 2?

A.
PE-1 must be configured with mesh-SDPs to every node receiving the multicast traffic. There is no
way to reduce the replication or bandwidth.

B.
PE nodes in Metro 1 could be configured with mesh-SDPs. PE nodes in Metro 2 would be
configured with mesh-SDPs. However, the connection between Metro networks (PE-2 to PE-6)
can be configured with a spoke-sdp. This would reduce the replication and bandwidth used on the
link between Metro networks. This also reduces the replication required by PE-1.

C.
PE-1 can be configured with spoke-SDPs to every PE node in both Metro networks. This will
reduce the bandwidth and replication within the network.

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 Nokia 4A0-105 Exam
D.
PE nodes in Metro 1 could be configured with spoke-SDPs. PE nodes in Metro 2 would be
configured with spoke-SDPs. However, the connection between Metro networks (PE-2 to PE-6)
can be configured with a mesh-sdp. This would reduce the replication and bandwidth used on the
link between Metro networks. This also reduces the replication required by PE-1.

Answer: B
Explanation:

QUESTION NO: 40

Why are provisioning requirements a factor that influence VPLS design? (Choose 2)

A.
Adding or removing a node may require several network touches.

B.
Adding or removing a SAP may require several network touches.

C.
Adding or removing a service may require several network touches.

D.
Adding or removing an Epipe may require several network touches.

E.
Provisioning is a factor for all Ethernet services.

Answer: A,C
Explanation:

QUESTION NO: 41

What are the advantages of running a physical ring topology with a mesh of mesh-SDPs? (Choose
2)

A.
STP can be used to break the loop.

B.
STP is not required to break the loop because of split-horizon rules.
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 Nokia 4A0-105 Exam
C.
If the traffic is primarily multicast, a full mesh of SDPs is a simple and efficient design.

D.
If the traffic is primarily Unicast, a full mesh of SDPs is a simple and efficient design.

Answer: B,D
Explanation:

QUESTION NO: 42

Consider a large metro-to-metro VPLS network interconnected with a mesh of mesh-SDPs. Which
of the following statements does NOT apply to this situation?

A.
Bandwidth and replication inefficiency can occur on inter-metro links if there is a lot of multicast
traffic

B.
The number of control sessions grows exponentially in a fully meshed network.

C.
Spanning-tree is required to prevent loops when using mesh SDPs on the inter-metro links.

D.
Network touches increase with each node added to the mesh.

Answer: C
Explanation:

QUESTION NO: 43

What scaling factors should a network engineer be aware of when designing VPLS networks?
(Choose 3)

A.
Control plane scaling.

B.
Data plane scaling.

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 Nokia 4A0-105 Exam
C.
Network touches.

D.
Route table reduction.

E.
OAM tools.

Answer: A,B,C
Explanation:

QUESTION NO: 44

Redundant spoke-SDPs are used between 2 Metro networks for redundancy. How can load
balancing be achieved across the redundant spoke-SDPs?

A.
A single management VPLS using RSTP can be used to block different SDPs for different VPLS
services.

B.
A single management VPLS using 802.1D-2004 can be used to block different SDPs for different
VPLS services

C.
There is no way to have load balancing across redundant spoke-SDPs.

D.
Two management VPLS using RSTP can be used to block different SDPs for different VPLS
services.

Answer: D
Explanation:

QUESTION NO: 45

Click on the exhibit below.

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 Nokia 4A0-105 Exam

How many LSPs are required in total between Metro A and Metro B if 100 hierarchical VPLS
services are deployed across the two metro networks?

A.
100

B.
200

C.
1

D.
2

Answer: D
Explanation:

QUESTION NO: 46

Click on the exhibit below.

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 Nokia 4A0-105 Exam

A new site is added to PE-D of Metro B. Which of the following statement below is true?

A.
If a spoke-SDP is configured between the new site and PE-D no further SDPs will be required.

B.
If a mesh- SDP is configured between the new site and PE-D no further SDPs will be required.

C.
A mesh- SDP must be configured between the new site and all other PEs within Metro B.

D.
A spoke- SDP must be configured between the new site and all other PEs within Metro B.

Answer: A
Explanation:

QUESTION NO: 47

What are the benefits of a hierarchical VPLS architecture? (Choose 3)

A.
Increases scalability

B.
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 Nokia 4A0-105 Exam
Reduces the FDB size within a VPLS instance

C.
Reduces replication and bandwidth utilization from the MDU device to the core network

D.
Easier to manage

E.
Reduces the routing table size

Answer: A,C,D
Explanation:

QUESTION NO: 48

Click on the exhibit below.

Study the diagram shown. What consideration should be given to the transport tunnel of SDP
300?

A.
The SDP must be configured to use GRE encapsulation.

B.
The SDP must follow the same path as the user's SDP.
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 Nokia 4A0-105 Exam
C.
The SDP should be configured to use an RSVP signaled transport with fast reroute.

D.
The SDP must be the same as the user's SDP.

Answer: C
Explanation:

QUESTION NO: 49

MAC explosion is best described as a large amount of MAC addresses being withdrawn and
relearned?

A.
TRUE

B.
FALSE

Answer: A
Explanation:

QUESTION NO: 50

What is the name of the feature supported on the Alcatel-Lucent 7750 SR that prevents MAC
explosion in large VPLS deployments?

A.
H-VPLS

B.
M-VPLS

C.
PBB

D.
MC-EP

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 Nokia 4A0-105 Exam
Answer: C
Explanation:

QUESTION NO: 51

Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose
2)

A.
The time to relearn thousands of MAC addresses may result in excessive flooding or loss of
packets.

B.
If the FDB reaches the limit, the router will discard frames.

C.
Discarding frames when the FDB limit is reached could deny SLA guarantees.

D.
It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA
guarantees.

Answer: A,D
Explanation:

QUESTION NO: 52

When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine
which l-VPLS it belongs to?

A.
The l-TAG in the l-SID is inspected to determine where the frame should be delivered.

B.
When the B-MAC header is stripped the customer MAC address is then looked up in the FDB

C.
The l-SID in the l-TAG is inspected to determine where the frame should be delivered.

D.
The PE inspects the service label in the MPLS header before stripping the B-MAC header.

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 Nokia 4A0-105 Exam
Answer: C
Explanation:

QUESTION NO: 53

If the max remote-age timer of a B-VPLS is reached, what happens to the remotely learned MAC
addresses in the l-VPLS service?

A.
There is no effect. The MAC addresses for the l-VPLS age out independently of the aging of B-
VPLS addresses.

B.
The MAC addresses for the l-VPLS will age out immediately following the remote-age out of the
backbone-macs of the B-VPLS.

C.
By default, the remote-age timer of the B-VPLS is configured to 0 and addresses do not age out.
The l-VPLS uses its own timer.

D.
The same timer is used for B-VPLS and l-VPLS addresses on the node.

Answer: B
Explanation:

QUESTION NO: 54

What is the default remote-age timer of a B-VPLS?

A.
The same timer is used in all VPLS types.

B.
Higher than the default timer of an I-VPLS.

C.
Lower than the default timer of an l-VPLS.

D.
The same timer as an l-VPLS.

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 Nokia 4A0-105 Exam
Answer: C
Explanation:

QUESTION NO: 55

Which of the following describes the scope of the IEEE 802.3ah EFM standard? (Choose 3)

A.
Monitor and troubleshoot a point-to-point full-duplex link.

B.
Monitor and troubleshoot end-to-end services.

C.
Can be used at the core to trigger MPLS protection mechanisms when a physical failure detection
is not possible.

D.
Should not be used at the core to trigger MPLS protection. BFD is the only method that can be
used when physical failure detection is not possible.

E.
Valuable in the last-mile connection to the Service Provider demarcation device.

Answer: A,C,E
Explanation:

QUESTION NO: 56

IEEE 802.3ah is similar to SONET/SDH in that it can count and report bit errors and frame errors.

A.
TRUE

B.
FALSE

Answer: A
Explanation:

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 Nokia 4A0-105 Exam

QUESTION NO: 57

Which PDU type is sent periodically over a link in the IEEE 802.3ah EFM as a method of
keepalive?

A.
Event notification.

B.
Loopback control.

C.
Information.

D.
Variable request.

E.
Variable response.

Answer: C
Explanation:

QUESTION NO: 58

In the IEEE 802.1 ag, how are merged services detected?

A.
The MEP sees the CFM frame from a different MEG.

B.
The MEP sees a different service-id in the frame sent by a MEP.

C.
The MIP transmits the service-id for each service. The MIP should only see it's own service-id.

D.
This is a function of 802,3ah EFM,

Answer: A
Explanation:

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 Nokia 4A0-105 Exam

QUESTION NO: 59

Which element of IEEE 802.1ag is responsible for initiating CFM messages?

A.
MEP

B.
MAP

C.
MIP

D.
MUP

Answer: A
Explanation:

QUESTION NO: 60

How does the IEEE 802.1ag loopback function differently from the loopback feature in 802.3ah?
(Choose 2)

A.
Theloopbackfuntionin802.1ag is an intrusive test that will stop customer data.

B.
The loopback function of 802.lag is a non-intrusive "ping" sent from a MEP to a remote MEP or
MIP.

C.
The loopback function in 802.3ah is an intrusive test that will loop customer data.

D.
The loopback function of 802.lag is an intrusive test that will "loop" all customer data back to the
original sender.

Answer: B,C
Explanation:

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 Nokia 4A0-105 Exam

Topic 2, Volume B

QUESTION NO: 61

What is the DA address used for in the Ethernet Header?

A.
MAC learning

B.
SA filtering

C.
Routing table population

D.
Frame forwarding

Answer: D
Explanation:

QUESTION NO: 62

How is MAC learning achieved in traditional Ethernet switches?

A.
As frames leave the switch, the DA is populated into the FDB.

B.
As frames enter the switch, the DA is populated into the FDB.

C.
As frames leave the switch, the SA is populated into the FDB.

D.
As frames enter the switch, the SA is populated into the FDB.

Answer: D
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 63

What is the maximum number of VLANs supported on a traditional Layer 2 switch?

A.
4094

B.
8190

C.
32768

D.
131071

Answer: A
Explanation:

QUESTION NO: 64

How is it possible for multiple services to be carried over the same MPLS LSPs?

A.
Multiple SDPs must be configured and bound to the LSPs for this to be possible.

B.
It is not possible to carry multiple services over the same MPLS LSPs.

C.
A vc-label is signaled per service.

D.
The vc-id is part of the data plane and maps the traffic to the appropriate service.

Answer: A
Explanation:

QUESTION NO: 65

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Based on the following output what will the vc-id be of any mesh-sdp bound to this service?

A.
9000

B.
1514

C.
1000

D.
100

Answer: C
Explanation:

QUESTION NO: 66

Which of the following functions must a PE router support when participating in a VPLS service?
(Choose 3)

A.
MAC learning

B.
Frame replication

C.
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 Nokia 4A0-105 Exam
Frame fragmentation

D.
Frame forwarding

E.
Must discard frames with an unknown destination MAC

F.
MSTP

Answer: A,B,D
Explanation:

QUESTION NO: 67

Five VPLS services have been configured between two PE routers. What is the minimum amount
of SDPs that must be configured?

A.
5-one for each service.

B.
2-one in each direction.

C.
10-five in each direction.

D.
None of the above.

Answer: B
Explanation:

QUESTION NO: 68

Multiple VPLS services can be offered over the same set of LSP tunnels?

A.
TRUE

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 Nokia 4A0-105 Exam
B.
FALSE

Answer: A
Explanation:

QUESTION NO: 69

Which service component in the data plane uniquely identifies a VPLS to the far end PE node?

A.
SDP id

B.
Service ID

C.
VC Label

D.
Tunnel Label

E.
Customer id

Answer: C
Explanation:

QUESTION NO: 70

Click on the exhibit below.

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 Nokia 4A0-105 Exam

The service MTU on PE-A is 1514 bytes and the service MTU on PE-C is 1518 bytes. What is the
status of the mesh-sdp between PE-A and PE-C?

A.
The mesh-sdp will be up.

B.
The mesh-sdp will be down.

C.
The mesh-sdp will only be up on PE-A.

D.
The mesh-sdp will only be up on PE-C.

Answer: B
Explanation:

QUESTION NO: 71

To reduce the amount of flooding between PE devices which of the following steps should be
taken?

A.
Configure the local age timer to be larger.

B.

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 Nokia 4A0-105 Exam
Configure the local age timer to be lower.

C.
Configure the remote age timer to be larger.

D.
Configure the remote age to be lower.

Answer: C
Explanation:

QUESTION NO: 72

Which of the following is a true statement?

A.
In a dynamic environment where MAC addresses are changing rapidly, the lower the age-time, the
larger the fdb-table-size should be.

B.
In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time,
the larger the fdb-table-size should be.

C.
In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time,
the smaller the fdb-table-size should be.

D.
There is no relationship between the age-time and the fdb-table-size.

Answer: B
Explanation:

QUESTION NO: 73

Which of the following OAM tools can be used as a VPLS topology discovery mechanism (Choose
2)?

A.
oam mac-ping

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 Nokia 4A0-105 Exam
B.
oam mac-populate

C.
oamsvc-ping

D.
oam mac-trace

Answer: A,D
Explanation:

QUESTION NO: 74

Click on the exhibit below.

In the following diagram, traffic ingressing on SAP 1/2/3:1 will be passed to the layer-2 DPI device
for inspection based on a filter policy applied to the ingress of the SAP. What feature should be
enabled on SAP 1/2/1:100 and SAP 1/2/2:100 to ensure that incorrect information is not populated
in the FDB of VPLS 1?

A.
Learning should be disabled on both SAPs connected to the DPI device to prevent FDB instability

B.
A MAC filter should be applied to both SAPs connected to the DPI to limit MAC learning on the
port

C.
An IP filter should be applied to both SAPs connected to the DPI to prevent FDB instability

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 Nokia 4A0-105 Exam
D.
The SAPs connected to the DPI should be configured with the "discard-unknown" feature to limit
MAC learning on the port

Answer: A
Explanation:

QUESTION NO: 75

How many designated ports are there in a spanning tree topology?

A.
The same as the number of alternate ports in the topology

B.
1 per segment

C.
The same as the number of root ports

D.
1 per switch

Answer: B
Explanation:

QUESTION NO: 76

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Which ports will become root ports? (Choose 3)

A.
Bridge B 1/1/3

B.
Bridge B 1/1/2

C.
Bridge C 1/1/2

D.
Bridge C 2/1/1

E.
Bridge D 1/1/1

F.
Bridge D 1/1/3

G.
Bridge E 1/1/1

H.
Bridge E 1/1/3

Answer: A,D,F

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 Nokia 4A0-105 Exam
Explanation:

QUESTION NO: 77

Why is it best practice to set the bridge priority in an STP network? (Choose 2)

A.
This is not a best practice. Any switch can be used as the root bridge.

B.
So that you know which links will be active in your network.

C.
To prevent a new switch from becoming root when added to the network.

D.
To allow all ports on the root switch to become alternate ports.

Answer: B,C
Explanation:

QUESTION NO: 78

One of the shortcomings of Spanning Tree Protocol (STP) is that it computes a valid, but not
necessarily optimal, path between nodes within a network.

A.
TRUE

B.
FALSE

Answer: A
Explanation:

QUESTION NO: 79

Which of the following statements about Spanning Tree Protocol is true?

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 Nokia 4A0-105 Exam
A.
The switch with the lowest priority becomes the root.

B.
The switch with the highest priority becomes the root.

C.
The switch with the lowest MAC address always becomes the root.

D.
The switch with the highest MAC address always becomes the root.

Answer: A
Explanation:

QUESTION NO: 80

Click on the exhibit below.

Which ports will become root ports? (Choose 3)

A.
Bridge B 1/1/3

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 Nokia 4A0-105 Exam
B.
Bridge B 1/1/2

C.
Bridge C 1/1/2

D.
Bridge C 2/1/1

E.
Bridge D 1/1/1

F.
Bridge D 1/1/3

G.
Bridge E 1/1/1

H.
Bridge E 1/1/3

Answer: B,D,F
Explanation:

QUESTION NO: 81

In RSTP, which state do all ports initialize in?

A.
Designated

B.
Discarding

C.
Listening

D.
Root

E.
Forwarding

Answer: B

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 Nokia 4A0-105 Exam
Explanation:

QUESTION NO: 82

Click on the exhibit below.

Management VPLS 100 has been created for redundant spoke-SDP connections. User VPLSs 10
and 20 are using the same spoke-SDPs that are being managed by VPLS 100. Unexpected
behavior has been reported. Based on the following output, what is the most likely reason for the
unexpected behavior?

A.
VPLS 100 was not actually configured as a management VPLS.

B.
VPLS 10 and VPLS 20 are not actually configured as a user VPLS.

C.
VPLS 10 and VPLS 20 are not using the same spoke-sdps that the management VPLS is using.

D.
Based on the output there is now way of telling if there is a problem with the configuration.

Answer: A
Explanation:

QUESTION NO: 83

Click on the exhibit below.

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 Nokia 4A0-105 Exam

You have been requested to add load balancing across the redundant spoke-SDPs in the network
shown. What further configuration is required? (Choose 2)

A.
An additional management VPLS.

B.
Another set of LSPs between PE1 and PE3 and between PE2 and PE4.

C.
Another set of SDPs between PE1 and PE3 and between PE2 and PE4.

D.
Load balancing has to be enabled within the management VPLS.

Answer: A,C
Explanation:

QUESTION NO: 84

The command "send flush-on-failure" has been enabled within a VPLS instance. What does the
PE do upon detection of a SAP failure within the VPLS?

A.
The PE sends an LDP control message that flushes all FDB entries in the VPLS instance.

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 Nokia 4A0-105 Exam
B.
The PE sends an LDP control message that flushes all FDB entries in the VPLS instance that are
associated with the PE that detected the failure.

C.
The PE flushes it's local FDB only.

D.
The PE sends an oam service message that flushes all FDB entries in the VPLS instance.

Answer: B
Explanation:

QUESTION NO: 85

What configuration is required on the CE device when using MC-LAG?

A.
The CE must be configured with an MC-LAG to both PE devices.

B.
The CE must be configured with LACP in active mode.

C.
There is no configuration required on the CE.

D.
The CE must be an Alcatel-Lucent 7750 SR.

Answer: B
Explanation:

QUESTION NO: 86

Why should you configure send-flush-on failure on your PE routers when using active/standby
pseudowires?

A.
It flushes the local FDB speeding recovery

B.

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 Nokia 4A0-105 Exam
It discards all packets in the queue and sends icmp-discad messages to the sender. The packets
are re-transmitted resulting in no loss of data.

C.
On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This
speeds convergence to the new topology.

D.
It is not important to use send-flush-on-failure as Active/Standby signalling automatically
converges the FDB in all VPLS instances

Answer: C
Explanation:

QUESTION NO: 87

Which physical topology is NOT commonly deployed in today's VPLS networks?

A.
Ring topologies.

B.
Metro-to-metro topologies

C.
H-VPLS topologies.

D.
Partial-mesh topologies.

Answer: D
Explanation:

QUESTION NO: 88

Which of the following is a function of the data plane that must be considered when provisioning a
VPLS service?

A.
Number of LSPs.

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 Nokia 4A0-105 Exam
B.
Number of TLDP sessions.

C.
Number of SDPs.

D.
MAC address consumption in the FDB.

E.
Bandwidth and replication requirements.

Answer: E
Explanation:

QUESTION NO: 89

Click on the exhibit below.

Given the following configuration, which service type will VPLS 1 and VPLS 100 be displayed as
with the "show service service-using" command?

A.
VPLS 1 will be displayed as mVPLS and VPLS 100 will be displayed as VPLS.

B.
VPLS 1 will be displayed as mVPLS and VPLS 100 will be displayed as uVPLS

C.
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 Nokia 4A0-105 Exam
VPLS 1 will be displayed as VPLS and VPLS 100 will be displayed as VPLS.

D.
VPLS 1 will displayed VPLS and VPLS 100 will be displayed as uVPLS.

Answer: A
Explanation:

QUESTION NO: 90

Click on the exhibit below.

If the device connected to PE-A in Metro A sends a frame to PE-A that requires replication within
the VPLS which devices is PE-A responsible for replicating the frame to?

A.
PE-A must replicate the frame to all devices participating in the VPLS

B.
PE-A must replicate the frame to all PEs within Metro A

C.
PE-A must replicate the frame to all devices in the Metro A

D.
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 Nokia 4A0-105 Exam
All of the above

Answer: B
Explanation:

QUESTION NO: 91

What type of SDP cannot be configured in an l-VPLS?

A.
Mesh-sdp

B.
Spoke-sdp

C.
MPLS

D.
GRE

Answer: A
Explanation:

QUESTION NO: 92

Which of the following describes the setting of the l-SID on the Alcatel-Lucent 7750 SR?

A.
The I-SID is set to 0 by default and is only used for interop purposes. The receiving PE uses the
service label to determine the I-VPLS.

B.
There is no default value. The I-SID must always be explicitly configured

C.
The I-SID is set to the service-id, unless the service-id is larger than a 24 bit value. In this case the
I-SID must be explicitly configured.

D.
The I-SID is always set to the service-id by default.

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 Nokia 4A0-105 Exam
Answer: C
Explanation:

QUESTION NO: 93

What option is available when using PBB to reduce the amount of required VPLS services?

A.
The Alcatel-Lucent 7750 SR supports 1:1 mapping of I-VPLS services to B-VPLS services.

B.
The Alcatel-Lucent 7750 SR supports 1:1 andM:1 mapping of l-VPLS services to B- VPLS
services.

C.
The Alcatel-Lucent 7750 SR supports the mapping of multiple, standard VPLS services to B-VPLS
services.

D.
The Alcatel-Lucent 7750 SR supports the mapping of multiple, standard VPLS services to l-VPLS
services.

Answer: B
Explanation:

QUESTION NO: 94

Which of the following is NOT a feature of the IEEE 802.3ah EFM standard?

A.
Discovery and auto-negotiation of OAM capabilities.

B.
Link monitoring via event notifications.

C.
Remote failure indication (RFI).

D.
Remote Loopback

E.
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 Nokia 4A0-105 Exam
Latency and jitter across a service.

Answer: E
Explanation:

QUESTION NO: 95

When ports configured with IEEE 802.3ah EFM are operationally down, what must the device do
before declaring the ports are up?

A.
The device will try to force the other side up using the evaluating flag in the PDU.

B.
The device will wait for the trasmit-interval of 5 before trying to rediscover the neighbor.

C.
The device will detect the port change and will wait for normal operation mode.

D.
The device will detect the port change and revert to discovery mode.

Answer: D
Explanation:

QUESTION NO: 96

Which function of the IEEE 802.1 ag is used for responding to CFM messages but not originating
them?

A.
MEP

B.
MAP

C.
MIP

D.
MUP

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 Nokia 4A0-105 Exam
Answer: C
Explanation:

QUESTION NO: 97

Which of the following statements regarding unicastand multicast frames is true for a traditional
layer 2 switch? (Choose 2)

A.
Multicast frames only forward out ports that have a known receiver.

B.
Unicast frames only forward out ports that have a known receiver.

C.
If the FDB is empty, unicast and multicast frames are treated equally.

D.
If the FDB has an entry for the unicast frame, both unicastand multicast are treated equally.

Answer: B,C
Explanation:

QUESTION NO: 98

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Given the following output what is the most likely reason the SDP binding is operationally down?
(Choose 2)

A.
The sdp id is different on the far-end.

B.
LDP is disabled on the far-end.

C.
The vc-id is different on the far-end.

D.
The mesh-sdp is missing on the far-end.

E.
The mesh-sdp is administratively shutdown on PEL

F.
There is an MTU mismatch.

Answer: C,D
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 Nokia 4A0-105 Exam
Explanation:

QUESTION NO: 99

You are providing a customer two VPLS services in two different Metro networks. VPLS 500 has
been configured in Metro 1 and VPLS 900 has been configured in Metro 2. The customer has
requested that they have connectivity between the Metro Networks with their existing VPLS
services. Which configuration on the PE routers linking the metro networks will allow for VPLS 500
and VPLS 900 to act as a single VPLS service? Assume default values for all VPLS parameters
and SDP 999 exists between the metro networks.

A.
Option A

B.
Option B

C.
Option C

D.
Option D

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 Nokia 4A0-105 Exam
Answer: A
Explanation:

QUESTION NO: 100

Which of the following describes the overhead added to a customer frame on an Ethernet link in a
VPLS service on the Alcatel-Lucent 7750 SR?

A.
The overhead consists of 26 bytes. 14 DLC + 2 Ethertype + 8 for mpls labels + 2 for GRE

B.
The overhead consists of 14 bytes for DLC.

C.
The overhead consists of 18 bytes. 14 DLC +4 for mpls labels

D.
The overhead consists of 22 bytes. 14 DLC + 8 for mpls labels

Answer: D
Explanation:

QUESTION NO: 101

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Assume a CE router is connected to the SAP of each PE. The arp cache of all CE routers is empty
and the FDB for VPLS 300 is empty. The CE router connected to PE-A initiates a ping towards the
CE router connected to PE-C. The ping is successful. Which of the following statements are true?
(Choose 2)

A.
The FDB on PE-A will contain entries for all CE routers.

B.
The FDB on PE-B will contain an entry for the CE router connected to PE-A.

C.
The FDB on PE-B will contain an entry for all CE routers.

D.
The FDB on PE-C will contain entries for the CE router connected to PE-A and the CE router
connected to PE-C.

Answer: B,D
Explanation:

QUESTION NO: 102

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 Nokia 4A0-105 Exam
Click on the exhibit below.

Which SDP on R3 will MAC addresses be associated with for devices behind R2?

A.
It depends if traffic is received via R4 or R1 from devices behind R2.

B.
The devices cannot communicate based on the configuration in the diagram so there will be no
mac address association.

C.
Devices behind R2 will be associated with the sdp between R3 and R1.

D.
Devices behind R2 will be associated with the sdp between R3 and R4.

Answer: C
Explanation:

QUESTION NO: 103

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 Nokia 4A0-105 Exam
Which of the following SAP encapsulations supports only one service on a port?

A.
Dot1Q

B.
Null

C.
Q-in-Q

D.
Ipcp

E.
BCP

Answer: B
Explanation:

QUESTION NO: 104

A customer has requested a VPLS service. The customer is using dot1q encapsulation and they
have requested that all vlan tags be transparently passed. Which two SAP IDs will accept VLAN
tags and pass them transparently? (Choose 2)

A.
sap 1/1/1

B.
sap 1/1/1:0*

C.
sap 1/1/1:0

D.
sap 1/1/1:*

Answer: A,D
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 105

Click on the exhibit below.

The SAP on PE-A has been configured with dot1q encapsulation. The SAP on PE-B has been
configured with qinq encapsulation. CE-A sends frames with a single tag of 100. The VLAN tag
from CE-A must be passed transparently. CE-B is expecting a frame with a top tag of 200 and
bottom tag of 100. Which of the following is the correct SAP id for PE-B?

A.
sap 1/1/1:200.100

B.
sap 1/1/1:200*

C.
sap 1/1/1:*

D.
sap 1/1/1:0*

Answer: B
Explanation:

QUESTION NO: 106

What is the MTU impact on the SDP path-mtu if fast reroute facilities-mode is implemented on the
LSP?

A.
There will be no impact on the path-mtu.

B.
The path-mtu will decrease by4 bytes.

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 Nokia 4A0-105 Exam
C.
The path-mtu will increase by 4 bytes.

D.
The path-mtu will decrease by 8 bytes.

E.
The path-mtu will increase by 8 bytes.

Answer: B
Explanation:

QUESTION NO: 107

What is the MTU impact on the SDP path-mtu if fast reroute, one-to-one mode is implemented on
the LSP?

A.
There will be no impact on the path-mtu.

B.
The path-mtu will decrease by4 bytes.

C.
The path-mtu will increase by 4 bytes.

D.
The path-mtu will decrease by 8 bytes.

E.
The path-mtu will increase by 8 bytes.

Answer: A
Explanation:

QUESTION NO: 108

The FDB has learned 2 MAC addresses. The first is from a device accessible via a locality defined
SAP, the second is from a device accessible via an SDP. Both MAC addresses were learned at
the exact same time. If all traffic from these hosts stops at the same time, which address will age
out first from the FDB based on default settings?

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 Nokia 4A0-105 Exam
A.
MAC learned via SAP

B.
MAC learned via SDP

C.
There is not enough information to determine

D.
Both will timeout at the same time

Answer: A
Explanation:

QUESTION NO: 109

The "discard-unknown" command has been enabled at the VPLS level. Which of the following
statements is true? (Choose 2)

A.
Broadcast traffic will be flooded.

B.
If the unicastSA has not been learned in the FDB, the frame will be dropped.

C.
If the unicast DA has not been learned in the FDB, the frame will be dropped.

D.
All traffic will be dropped, including multicast and broadcast.

E.
Broadcast traffic will be dropped.

Answer: A,C
Explanation:

QUESTION NO: 110

What is the result of initiating an oam mac-ping to an unknown unicast MAC address in a VPLS
instance?
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 Nokia 4A0-105 Exam
A.
The oam mac-ping will fail. The MAC address must be known in the local FDB to be successful.

B.
The request will be flooded and the only response will come from the PE node that has learned
the specified MAC address on a local SAP.

C.
The request will be flooded and the CE device with the corresponding MAC will reply.

D.
All nodes will reply because the oam mac-ping is flooded.

Answer: B
Explanation:

QUESTION NO: 111

Which of the following features can be enabled to eliminate MAC instability when using policy-
based forwarding to redirect traffic to a Layer 2 DPI device?

A.
discard-unknown

B.
mac-move

C.
disable-learning

D.
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 Nokia 4A0-105 Exam
enable-mac-stability

Answer: C
Explanation:

QUESTION NO: 112

What needs to be configured in a VPLS in order to forward customer STP BPDUs transparently?

A.
Spanning tree must be enabled within the VPLS.

B.
Spanning tree BPDUs must be untagged.

C.
Spanning tree BPDUs must be tagged.

D.
Spanning tree must be disabled within the VPLS.

Answer: D
Explanation:

QUESTION NO: 113

RSTP blocks a spoke-sdp using a management VPLS. Is traffic affected on an ES using the same
transport SDP?

A.
Yes

B.
No

Answer: A
Explanation:

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 Nokia 4A0-105 Exam
QUESTION NO: 114

What is the default Spanning Tree protocol used in a VPLS on the Alcatel-Lucent 7750 SR?

A.
802.1D2004

B.
802.1D 1998

C.
comp-dot1w

D.
PVST

Answer: A
Explanation:

QUESTION NO: 115

Click on the exhibit below.

Study the network diagram. Which of the following configurations is correct for user VPLS 100 on
PE4?

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 Nokia 4A0-105 Exam
A.
Option A

B.
Option B

C.
Option B

D.
Option C

E.
Option E

Answer: C
Explanation:

QUESTION NO: 116

What must be enabled in order to prevent a loop within a LAG?

A.
RSTP

B.
Dynamic-cost

C.
LACP active

D.
Nothing, There are no loops in LAGs

Answer: C
Explanation:

QUESTION NO: 117

When deploying Active/Standby pseudowires, the CE does not require any special configuration

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 Nokia 4A0-105 Exam
A.
TRUE

B.
FALSE

Answer: B
Explanation:

QUESTION NO: 118

What of the following is a key benefit of Active/Standby pseudowires?

A.
The MDU does not need to support MPLS.

B.
Can be used in ring networks of 4 or more nodes

C.
Does not require the use of a layer 2 loop prevention protocol such as RSTP

D.
The MDU does not have to be aware of the active/standby configuration

Answer: C
Explanation:

QUESTION NO: 119

Click on the exhibit below.

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 Nokia 4A0-105 Exam

Assuming there is a full mesh of mesh-SDPs between the PEs within each metro network and a
spoke-SDP between PE-C of Metro A and PE-B of Metro B. how is traffic forwarded from PE-A in
Metro A to PE-D of Metro B? Select the most accurate statement.

A.
An LSP must be configured between PE-A and PE-D for this traffic to be forwarded.

B.
A VPLS FDB lookup is done at PE-A of Metro A only

C.
An SDP must be configured between PE-A of Metro A and PE-D of Metro D for this traffic to be
forwarded

D.
A VPLS FDB lookup is done at PE-A and PE-C of Metro A and PE-B of Metro B

Answer: D
Explanation:

QUESTION NO: 120

H-VPLS solves the data-plane and control-plane problems with the exception of one issue. What
is the concern that H-VPLS does not solve?

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 Nokia 4A0-105 Exam
A.
Increased LSP count.

B.
Number of TLDP sessions.

C.
The amount of network touches.

D.
FDB consumption.

E.
Increased bandwidth and replication.

Answer: D
Explanation:

Topic 3, Volume C

QUESTION NO: 121

An l-VPLS is configured with a service id of 511. What will the value of the l-SID be assuming a
default configuration?

A.
The 1-SID must be explicitly configured.

B.
The 1-SID only supports a range from 1 to 255.

C.
The 1-SID will default to 511 .the value of the service-id.

D.
Thel"SIDwilldefaultto131582, the value of the service-id + 131071.

Answer: C
Explanation:

QUESTION NO: 122

Which of the following are true when ports are configured with the IEEE 802.3ah Loopback Control
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 Nokia 4A0-105 Exam
feature? (Choose 3)

A.
The loopback control PDU instructs the remote port to enter loopback mode.

B.
Putting a port in loopback does not affect customer data flow

C.
Both ports must rediscover the OAM capabilities of each other once the port is put back into
service.

D.
Both ports must still send Information PDUs to avoid going back to discovery mode.

E.
When a port is in loopback mode, service mirroring will still work if it is a mirror-source or mirror-
destination.

F.
All packets, except for information PDUs, are looped back.

Answer: A,D,F
Explanation:

QUESTION NO: 123

IEEE 802.3ah frames must be untagged.

A.
TRUE

B.
FALSE

Answer: A
Explanation:

QUESTION NO: 124

In IEEE 802.1ag, how are loops detected?

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 Nokia 4A0-105 Exam
A.
Spanning-tree BPDUs are returned to the sender.

B.
The MEP sees its own CFM frames returned to itself.

C.
This is not a function of IEEE 802.lag but of 802.1D

D.
The record field of the CFM frame keeps track of chassis-mac addresses.

Answer: B
Explanation:

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