JNCIA-Junos: Practice Test One
55 correct
With regard to the Junos software architecture, which two of the
following are found on all Junos devices? (Choose two.)
Selected Answer
multiple software daemons
separation of control and forwarding
Correct
multiple software daemons
separation of control and forwarding
What are two Junos processes? (Choose two.)
Selected Answer
routing protocols process
Packet Forwarding Engine process
Correct
routing protocols process
Packet Forwarding Engine process
The Junos software kernel is based on which operating system?
Selected Answer
FreeBSD
Correct
FreeBSD
Which two statements are correct regarding the internal link
between the control plane and forwarding plane? (Choose two.)
Selected Answer
The internal link rate limits exception traffic to protect the Routing Engine against denial-
of-service attacks.
The internal link has a built-in rate limiter that is not configurable.
Correct
The internal link rate limits exception traffic to protect the Routing Engine against denial-
of-service attacks.
The internal link has a built-in rate limiter that is not configurable.
What are three examples of exception traffic? (Choose three.)
Selected Answer
SNMP traffic destined to the Junos device
Packets with special IP options fields
OSPF protocol updates
Correct
SNMP traffic destined to the Junos device
Packets with special IP options fields
OSPF protocol updates
Which part of the Junos architecture handles ICMP time-to-live (TTL)
expired messages?
Selected Answer
forwarding plane
Correct
forwarding plane
What are two functions of the Packet Forwarding Engine? (Choose
two.)
Selected Answer
to implement policing, firewall filtering, and class of service (CoS)
to forward packets based on the forwarding table
Correct
to implement policing, firewall filtering, and class of service (CoS)
to forward packets based on the forwarding table
When a non-root user connects to a Junos device and successfully
enters a username and password, they are immediately placed at
which level?
Selected Answer
operational mode
Correct
operational mode
In which Junos mode are users allowed to monitor and troubleshoot
software, network connectivity, and hardware?
Selected Answer
operational
Correct
operational
In which mode can you configure a device running Junos?
Selected Answer
configuration
Correct
configuration
Which Junos mode should you use to view the status of interfaces on
a router?
Selected Answer
operational
Correct
operational
Which statement about the Junos CLI is true?
Selected Answer
Automatic word completion can be disabled in operational mode.
Correct
Automatic word completion can be disabled in operational mode.
What information does the help reference command provide?
(Choose three.)
Selected Answer
command default parameters and allowed value ranges
command syntax
the configuration level at which the command can be entered
Correct
command default parameters and allowed value ranges
command syntax
the configuration level at which the command can be entered
The auto-complete feature in the Junos CLI is triggered by which
methods?
Selected Answer
pressing the Tab key for both variable and command completion and the Spacebar for
command completion
Correct
pressing the Tab key for both variable and command completion and the Spacebar for
command completion
What information does the help topic command provide?
Selected Answer
software documentation describing features and configuration tasks within the Junos OS
Correct
software documentation describing features and configuration tasks within the Junos OS
Which character in the Junos software CLI allows you to filter and
manipulate command output?
Selected Answer
pipe character
Correct
pipe character
When you first log in to a router, how does the router indicate that
factory defaults are being used?
Selected Answer
The router's host name is Amnesiac.
Correct
The router's host name is Amnesiac.
Which configuration command can you use to reset a Junos device to
factory defaults?
Selected Answer
load factory-default
Correct
load factory-default
After factory-defaults have been loaded, which two syslog files will
be present in the configuration?
Selected Answer
messages and interactive-commands
Correct
messages and interactive-commands
Which three configuration elements are considered part of the initial
configuration? (Choose three.)
Selected Answer
hostname
management access interface
root password
Correct
hostname
management access interface
root password
What are two valid initial configuration methods supported on Junos
devices? (Choose two)
Selected Answer
CLI
J-Web
Correct
CLI
J-Web
Which command would correctly define a Junos device’s hostname?
Selected Answer
user@host> set system host-name <name>
Correct
user@host# set system host-name <name>
Which Junos CLI operational command will gracefully shut down a
router?
Selected Answer
request system halt
Correct
request system halt
Which command correctly sets a Junos device’s date and time?
Selected Answer
user@host> set date 199708290900.00
Correct
user@host> set date 199708290900.00
Which two statements are true about the rescue configuration file?
(Choose two.)
Selected Answer
You can load it by entering rollback rescue.
You need to create it using the command request system configuration rescue save.
Correct
You can load it by entering rollback rescue.
You need to create it using the command request system configuration rescue save.
Which two statements are true about login classes in the Junos OS?
(Choose two.)
Selected Answer
A different login class must be configured for each user.
Individual commands can be explicitly allowed or denied.
Correct
Each login class is associated with one or more permissions flags.
Individual commands can be explicitly allowed or denied.
Which operational command allows you to quickly verify the state of
all physical and logical interfaces?
Selected Answer
show interfaces summary
Correct
show interfaces terse
The monitor traffic command closely resembles which UNIX-based
utility?
Selected Answer
tcpdump
Correct
tcpdump
Which two statements are correct about the disable command and
the deactivate commands? (Choose two.)
Selected Answer
If the interface is deactivated, the physical interface will administratively shut down.
If the interface is disabled, the logical unit will administratively shut down.
Correct
If the interface is deactivated, the interface configuration is ignored during commit.
If the interface is disabled, the logical unit will administratively shut down.
In Ethernet networks, duplex mismatches will lower performance.
Which error statistics can be seen if a duplex mismatch is present?
Selected Answer
collisions on the full-duplex side; runts on the half-duplex side
Correct
collisions on the half-duplex side; framing errors on the full-duplex side
When a local loopback is activated on a PPP serial link, which of the
following indicates that the local interface is good?
Selected Answer
A ping to the local address succeeds.
Correct
The interface shows a flag indicating that a loop is detected.
Which operational command would you enter to see a concise
display of which interfaces are up and which are down?
Selected Answer
show interfaces terse
Correct
show interfaces terse
Which operational command is a valid way to view the status of an
interface?
Selected Answer
show interfaces fe-0/0/0 extensive
Correct
show interfaces fe-0/0/0 extensive
Which operational command is used to view status messages sent to
a file named test as they are sent?
Selected Answer
monitor start test
Correct
monitor start test
In which routing table would you find an OSPFv2 route?
Selected Answer
inet.0
Correct
inet.0
Which routing table is used for all IPv4 unicast forwarding?
Selected Answer
inet.0
Correct
inet.0
By default, which routing table is used to store unicast IPv4 routes?
Selected Answer
inet.0
Correct
inet.0
Which two statements are correct about routing tables in a Junos
device? (Choose two.)
Selected Answer
There are separate tables for IPv4 and IPv6 called inet.0 and inet6.0, respectively.
All running protocols can populate the routing tables at the same time.
Correct
There are separate tables for IPv4 and IPv6 called inet.0 and inet6.0, respectively.
All running protocols can populate the routing tables at the same time.
Which type of routes are held in inet.0?
Selected Answer
IPv4 unicast routes
Correct
IPv4 unicast routes
What is the role of route preference?
Selected Answer
It is used to determine which route should become active.
Correct
It is used to determine which route should become active.
What is a characteristic of route preference?
Selected Answer
A lower preference is better than a higher preference.
Correct
A lower preference is better than a higher preference.
Which operational command displays the routing table?
Selected Answer
show route
Correct
show route
Which operational command allows viewing of only OSPF routes?
Selected Answer
show ip ospf route
Correct
show route protocol ospf
Which statement is true about a forwarding table?
Selected Answer
It stores a subset of information from the routing table.
Correct
It stores a subset of information from the routing table.
Which statement is correct about a routing policy term?
Selected Answer
The most specific term has precedence.
Correct
A term acts like "if" and "then" statements.
Your Junos device has a routing policy with three terms. The first
term of the policy does not contain a terminating action. What
happens to the routes after they have been evaluated by the first
term?
Selected Answer
The routes are evaluated by the second term in the policy.
Correct
The routes are evaluated by the second term in the policy.
Which statement is true about import and export routing policies?
Selected Answer
Import policies concern routes received and determine which routes get put into the
routing table.
Correct
Import policies concern routes received and determine which routes get put into the
routing table.
Your routing table contains four static routes, which you need to
redistribute to your OSPF peers. Which method would accomplish
this task?
Selected Answer
Apply an export policy to the static route configuration, which will export the routes to
other protocols.
Correct
Apply an export policy to OSPF, which will export the static routes to your OSPF
neighbors.
Which three of the following are considered match criteria in a
policy? (Choose three.)
Selected Answer
next-term
prefix-list
AS path
Correct
prefix-list
AS path
protocol ospf
Which two of the following are considered match criteria in a policy?
(Choose two.)
Selected Answer
prefix-file
AS path
Correct
community
AS path
Which of the following is a valid match criteria for a firewall filter?
Selected Answer
from protocol tcp
Correct
from protocol tcp
Which two policy actions are considered flow control actions?
(Choose two.)
Selected Answer
community add
Correct
next policy
next term
What is a valid action for a firewall filter?
Selected Answer
then count
Correct
then count
What are three terminating actions for a firewall filter? (Choose
three.)
Selected Answer
terminate
reject
discard
Correct
reject
discard
accept
What are two functions of the Routing Engine? (Choose two.)
Selected Answer
to receive and process packets that could not be forwarded by the PFE
to verify that packets arriving at the router are allowed by any configured firewall filters
Correct
to build the Layer 2 and Layer 3 forwarding tables
to build OSPF and IS-IS adjacencies
