Examen cisco 2
1. What OSI physical layer term describes the process by which one wave modifies
another wave?
IEEE
EIA/TIA
air
modulation
2. Which two devices commonly affect wireless networks? (Choose two.)
external hard drives
microwaves
incandescent light bulbs
cordless phones
home theaters
Blu-ray players
3. A network administrator is measuring the transfer of bits across the company
backbone for a mission critical financial application. The administrator notices that
the network throughput appears lower than the bandwidth expected. Which three
factors could influence the differences in throughput? (Choose three.)
the amount of traffic that is currently crossing the network
the sophistication of the encapsulation method applied to the data
the type of traffic that is crossing the network
the latency that is created by the number of network devices that the data is crossing
the bandwidth of the WAN connection to the Internet
the reliability of the gigabit Ethernet infrastructure of the backbone
Examen cisco 2
4. What is a primary role of the Physical layer in transmitting data on the network?
control data access to the media
create the signals that represent the bits in each frame on to the media
determine the path packets take through the network
provide physical addressing to the devices
5. Refer to the graphic. What type of cabling is shown?
coax
fiber
UTP
STP
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6. Refer to the graphic. What type of cabling is shown?
fiber
UTP
STP
coax
7. What are two characteristics of fiber-optic
cable? (Choose two.)
It is not affected by EMI or RFI.
It is more expensive than UTP cabling is.
It combines the technique of cancellation, shielding, and twisting to protect data.
It typically contains 4 pairs of fiber-optic wires.
Each pair of cables is wrapped in metallic foil.
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8. What action will occur if a switch receives a frame and does have the source MAC
address in the MAC table?
Examen cisco 2
The switch does not forward the frame.
The switch shares the MAC address table entry with any connected switches.
The switch adds it to its MAC address table associated with the port number.
The switch refreshes the timer on that entry.
9. Which port does Switch0 use to send frames to the host with the IPv4 address
10.1.1.5?
Fa0/1
Fa0/5
Fa0/9
Fa0/11
10. Refer to the exhibit. What is wrong with the displayed termination?
The untwisted length of each wire is too long.
The wires are too thick for the connector that is used.
The woven copper braid should not have been removed.
The wrong type of connector is being used.
11. What does the term "attenuation" mean in data communication?
loss of signal strength as distance increases
leakage of signals from one cable pair to another
time for a signal to reach its destination
strengthening of a signal by a networking device
12. Refer to the exhibit. The PC is connected to the console port of the switch. All the
other connections are made through FastEthernet links. Which types of UTP cables
can be used to connect the devices?
Examen cisco 2
1 - rollover, 2 - straight-through, 3 - crossover
1 - crossover, 2 - rollover, 3 - straight-through
1 - rollover, 2 - crossover, 3 - straight-through
1 - crossover, 2 - straight-through, 3 – rollover
13. What makes fiber preferable to copper cabling for interconnecting buildings?
(Choose three.)
greater bandwidth potential
easily terminated
greater distances per cable run
limited susceptibility to EMI/RFI
lower installation cost
durable connections
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14. What is the function of the CRC value that is found in the FCS field of a frame?
to verify the logical address in the frame
to verify the physical address in the frame
to compute the checksum header for the data field in the frame
to verify the integrity of the received frame
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15. What is a characteristic of the LLC sublayer?
It defines software processes that provide services to the physical layer.
Examen cisco 2
It places information in the frame allowing multiple Layer 3 protocols to use the same
network interface and media.
It provides the logical addressing required that identifies the device.
It provides delimitation of data according to the physical signaling requirements of the
medium.
16. Which two fields or features does Ethernet examine to determine if a received frame
is passed to the data link layer or discarded by the NIC? (Choose two.)
auto-MDIX
minimum frame size
source MAC address
CEF
Frame Check Sequence
17. Which three basic parts are common to all frame types supported by the data link
layer? (Choose three.)
trailer
data
header
type field
MTU size
CRC value
Examen cisco 2
18. A network team is comparing physical WAN topologies for connecting remote sites
to a headquarters building. Which topology provides high availability and connects
some, but not all, remote sites?
hub and spoke
partial mesh
mesh
point-to-point
19. Which statement describes a characteristic of the frame header fields of the data link
layer?
They all include the flow control and logical connection fields.
Ethernet frame header fields contain Layer 3 source and destination addresses.
They include information on user applications.
They vary depending on protocols.
20. What are three ways that media access control is used in networking? (Choose
three.)
Media access control provides placement of data frames onto the media.
Networks with controlled access have reduced performance due to data collisions.
Ethernet utilizes CSMA/CD.
802.11 utilizes CSMA/CD.
Data link layer protocols define the rules for access to different media.
Contention-based access is also known as deterministic.
Examen cisco 2
21. What is contained in the trailer of a data-link frame?
data
physical address
logical address
error detection
22. What type of communication rule would best describe CSMA/CD?
message encapsulation
flow control
access method
message encoding
23. A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port
connected to a 100Base-T network. Which method of memory buffering would work
best for this task?
port-based buffering
level 1 cache buffering
fixed configuration buffering
shared memory buffering
24. When the store-and-forward method of switching is in use, what part of the
Ethernet frame is used to perform an error check?
source MAC address in the header
CRC in the trailer
destination MAC address in the header
protocol type in the header
Examen cisco 2
25. Which switching method uses the CRC value in a frame?
cut-through
fragment-free
store-and-forward
fast-forward
26. Which advantage does the store-and-forward switching method have compared with
the cut-through switching method?
faster frame forwarding
frame error checking
collision detecting
frame forwarding using IPv4 Layer 3 and 4 information
27. A network administrator is connecting two modern switches using a straight-through
cable. The switches are new and have never been configured. Which three
statements are correct about the final result of the connection? (Choose three.)
The link between the switches will work at the fastest speed that is supported by both
switches.
The link between switches will work as full-duplex.
The connection will not be possible unless the administrator changes the cable to a
crossover cable.
The duplex capability has to be manually configured because it cannot be negotiated.
If both switches support different speeds, they will each work at their own fastest speed.
The auto-MDIX feature will configure the interfaces eliminating the need for a crossover
cable.
Examen cisco 2
28. What are two actions performed by a Cisco switch? (Choose two.)
examining the destination MAC address to add new entries to the MAC address table
forwarding frames with unknown destination IP addresses to the default gateway
building a routing table that is based on the first IP address in the frame header
using the source MAC addresses of frames to build and maintain a MAC address table
utilizing the MAC address table to forward frames via the destination MAC address
29. Which frame forwarding method receives the entire frame and performs a CRC check
to detect errors before forwarding the frame?
fragment-free switching
cut-through switching
fast-forward switching
store-and-forward switching
30. Which is a multicast MAC address?
FF-FF-FF-FF-FF-FF
00-26-0F-4B-00-3E
01-00-5E-00-00-03
5C-26-0A-4B-19-3E
31. What is the auto-MDIX feature on a switch?
the automatic configuration of full-duplex operation over a single Ethernet copper or
optical cable
the ability to turn a switch interface on or off accordingly if an active connection is
detected
the automatic configuration of an interface for a straight-through or a crossover Ethernet
cable connection
the automatic configuration of an interface for 10/100/1000 Mb/s operation
Examen cisco 2
32. Which two statements describe features or functions of the logical link control
sublayer in Ethernet standards? (Choose two.)
The LLC sublayer adds a header and a trailer to the data.
Logical link control is specified in the IEEE 802.3 standard.
Logical link control is implemented in software.
The LLC sublayer is responsible for the placement and retrieval of frames on and off the
media.
The data link layer uses LLC to communicate with the upper layers of the protocol suite.
33. What is one advantage of using the cut-through switching method instead of the
store-and-forward switching method?
has a lower latency appropriate for high-performance computing applications
provides the flexibility to support any mix of Ethernet speeds
makes a fast forwarding decision based on the source MAC address of the frame
has a positive impact on bandwidth by dropping most of the invalid frames
34. Which two functions are performed at the LLC sublayer of the OSI data link layer?
(Choose two.)
Integrates various physical technologies.
Implements a process to delimit fields within a Layer 2 frame.
Controls the NIC responsible for sending and receiving data on the physical medium.
Enables IPv4 and IPv6 to utilize the same network interface and media.
Places information in the frame that identifies which network layer protocol is being used
for the frame.
