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CISCO MOD 4-7
CISCO MOD 4-7
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1
A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network.
shared memory buffering
port-based buffering
fixed configuration buffering
level 1 cache buffering
2
What is the purpose of the FCS field in a frame?
to determine if errors occurred in the transmission and reception
to verify the logical address of the sending node
to compute the CRC header for the data field
to obtain the MAC address of the sending node
3
What is a primary role of the Physical layer in transmitting data on the network?
provide physical addressing to the devices
determine the path packets take through the network
create the signals that represent the bits in each frame on to the media
control data access to the media
4
What are two characteristics of fiber-optic cable? (Choose two.)
It is not affected by EMI or RFI.
Each pair of cables is wrapped in metallic foil.
It typically contains 4 pairs of fiber-optic wires.
It is more expensive than UTP cabling is.
5
What OSI physical layer term describes the physical medium which uses electrical pulses?
copper cable
goodput
fiber-optic cable
air
6
A network administrator is connecting two modern switches using a straight-through cable. The switches are new
The connection will not be possible unless the administrator changes the cable to a crossover c
The link between switches will work as full-duplex.
The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
The link between the switches will work at the fastest speed that is supported by both switches
7
What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?
The switch sends the frame to a connected router because the destination MAC address is not loc
The switch forwards it out all ports except the ingress port.
The switch does not forward the frame.
The switch shares the MAC address table entry with any connected switches.
8
What OSI physical layer term describes the measure of usable data transferred over a given period of time?
copper cable
goodput
air
fiber-optic cable
9
Which switching method uses the CRC value in a frame?
cut-through
store-and-forward
fragment-free
fast-forward
10
Which two statements describe the services provided by the data link layer? (Choose two.)
It packages various Layer 3 PDUs into a frame format that is compatible with the network interf
It manages the access of frames to the network media.
It defines the end-to-end delivery addressing scheme.
It provides reliable delivery through link establishment and flow control.
11
Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
header
data
trailer
CRC value
12
A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial
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 amount of traffic that is currently crossing the network
13
Which type of UTP cable is used to connect a PC to a switch port?
straight-through
crossover
console
rollover
14
Which statement is true about the CSMA/CD access method that is used in Ethernet?
Devices involved in a collision get priority to transmit after the backoff period.
When a device hears a carrier signal and transmits, a collision cannot occur.
All network devices must listen before transmitting.
A jamming signal causes only devices that caused the collision to execute a backoff algorithm.
15
What type of communication rule would best describe CSMA/CD?
access method
message encapsulation
message encoding
flow control
16
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to anothe
copper cable
air
fiber-optic cable
latency
17
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Implements a trailer to detect transmission errors.
Provides synchronization between source and target nodes.
Adds Layer 2 control information to network protocol data.
Enables IPv4 and IPv6 to utilize the same network interface and media.
18
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
Places information in the frame that identifies which network layer protocol is being used for
Enables IPv4 and IPv6 to utilize the same network interface and media.
Implements a trailer to detect transmission errors.
Controls the NIC responsible for sending and receiving data on the physical medium.
19
What is contained in the trailer of a data-link frame?
logical address
error detection
data
physical address
20
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (2)
crosstalk
bandwidth
electromagnetic interference
size of the network
21
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding
fast-forward switching
store-and-forward switching
cut-through switching
fragment-free switching
22
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
using the source MAC addresses of frames to build and maintain a MAC address table
building a routing table that is based on the first IP address in the frame header
utilizing the MAC address table to forward frames via the destination MAC address
23
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
The switch refreshes the timer on that entry.
The switch forwards the frame to the associated port.
The switch sends the frame to a connected router because the destination MAC address is not loc
The switch adds it to its MAC address table associated with the port number.
24
What is the auto-MDIX feature?
It enables a device to automatically configure the duplex settings of a segment.
It enables a device to automatically configure the speed of its interface.
It enables a device to automatically configure an interface to use a straight-through or a cros
It enables a switch to dynamically select the forwarding method.
25
What OSI physical layer term describes the process by which one wave modifies another wave?
EIA/TIA
modulation
IEEE
air
26
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to anothe
goodput
throughput
latency
bandwidth
27
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)
limited susceptibility to EMI/RFI
lower installation cost
greater bandwidth potential
greater distances per cable run
28
What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?
The host forwards the frame to the router.
The host forwards the frame to all other hosts.
The host will process the frame.
The host sends the frame to the switch to update the MAC address table.
29
What OSI physical layer term describes the physical medium for microwave transmissions?
air
throughput
goodput
latency
30
What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?
The switch shares the MAC address table entry with any connected switches.
The switch does not forward the frame.
The switch forwards it out all ports except the ingress port.
The switch sends the frame to a connected router because the destination MAC address is not loc
31
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Implements a process to delimit fields within a Layer 2 frame.
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
Controls the NIC responsible for sending and receiving data on the physical medium.
32
What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?
makes a fast forwarding decision based on the source MAC address of the frame
has a lower latency appropriate for high-performance computing applications
provides the flexibility to support any mix of Ethernet speeds
has a positive impact on bandwidth by dropping most of the invalid frames
33
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Provides synchronization between source and target nodes.
Implements a trailer to detect transmission errors.
Enables IPv4 and IPv6 to utilize the same network interface and media.
Adds Layer 2 control information to network protocol data.
34
Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer
auto-MDIX
source MAC address
Frame Check Sequence
minimum frame size
35
What OSI physical layer term describes the physical medium that uses the propagation of light?
throughput
fiber-optic cable
latency
goodput
36
What are two examples of the cut-through switching method? (Choose two.)
fragment-free switching
store-and-forward switching
CRC switching
fast-forward switching
37
During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
The process port number is added.
An IP address is added.
The physical address is added.
The logical address is added.
38
What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?
The host returns the frame to the switch.
The host replies to the switch with its own IP address.
The host will process the frame.
The host forwards the frame to all other hosts.
39
What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?
bandwidth
goodput
throughput
latency
40
Which statement describes an extended star topology?
End devices connect to a central intermediate device, which in turn connects to other central i
All end and intermediate devices are connected in a chain to each other.
Each end system is connected to its respective neighbor via an intermediate device.
End devices are connected together by a bus and each bus connects to a central intermediate dev
41
Which procedure is used to reduce the effect of crosstalk in copper cables?
designing a cable infrastructure to avoid crosstalk interference
twisting opposing circuit wire pairs together
requiring proper grounding connections
wrapping the bundle of wires with metallic shielding
42
Which switching method has the lowest level of latency?
store-and-forward
cut-through
fragment-free
fast-forward
43
Which characteristic describes crosstalk?
the loss of wireless signal over excessive distance from the access point
the distortion of the transmitted messages from signals carried in adjacent wires
the weakening of the network signal over long cable lengths
the distortion of the network signal from fluorescent lighting
44
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error ✔️
source MAC address in the header
protocol type in the header
CRC in the trailer
destination MAC address in the header
45
Which advantage does the store-and-forward switching method have compared with the cut-through switching method?
frame error checking
faster frame forwarding
collision detecting
frame forwarding using IPv4 Layer 3 and 4 information
46
What is the purpose of the OSI physical layer?
transmitting bits across the local media
performing error detection on received frames
exchanging frames between nodes over physical network media
controlling access to media
47
Which statement describes a characteristic of the frame header fields of the data link layer?
Ethernet frame header fields contain Layer 3 source and destination addresses.
They all include the flow control and logical connection fields.
They vary depending on protocols.
They include information on user applications.
48
What three items are contained in an Ethernet header and trailer? (Choose three.)
destination IP address
error-checking information
destination MAC address
source MAC address
49
Which two devices commonly affect wireless networks? (Choose two.)
microwaves
cordless phones
Blu-ray players
home theaters
50
What is a characteristic of the LLC sublayer?
It places information in the frame allowing multiple Layer 3 protocols to use the same network
It defines software processes that provide services to the physical layer.
It provides delimitation of data according to the physical signaling requirements of the medium
It provides the logical addressing required that identifies the device.
51
Which media communication type does not require media arbitration in the data link layer?
controlled access
deterministic
full-duplex
half-duplex
52
What does the term “attenuation” mean in data communication?
strengthening of a signal by a networking device
time for a signal to reach its destination
loss of signal strength as distance increases
leakage of signals from one cable pair to another
53
What is the auto-MDIX feature on a switch?
the automatic configuration of an interface for 10/100/1000 Mb/s operation
the automatic configuration of an interface for a straight-through or a crossover Ethernet cabl
the automatic configuration of full-duplex operation over a single Ethernet copper or optical c
the ability to turn a switch interface on or off accordingly if an active connection is detecte
54
What OSI physical layer term describes the capacity at which a medium can carry data?
bandwidth
IEEE
EIA/TIA
air
55
What are three ways that media access control is used in networking? (Choose three.)
Data link layer protocols define the rules for access to different media.
Ethernet utilizes CSMA/CD.
Media access control provides placement of data frames onto the media.
Networks with controlled access have reduced performance due to data collisions.
56
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?
the reflection of the electrical wave back from the far end of the cable
the collision caused by two nodes trying to use the media simultaneously
the magnetic field around the adjacent pairs of wire
the use of braided wire to shield the adjacent wire pairs
57
Which is a multicast MAC address?
5C-26-0A-4B-19-3E
FF-FF-FF-FF-FF-FF
01-00-5E-00-00-03
00-26-0F-4B-00-3E
58
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (2)
Logical link control is implemented in software.
The data link layer uses LLC to communicate with the upper layers of the protocol suite.
The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.
The LLC sublayer adds a header and a trailer to the data.
59
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 compute the checksum header for the data field in the frame
to verify the physical address in the frame
to verify the integrity of the received frame
60
Why are two strands of fiber used for a single fiber optic connection?
They prevent crosstalk from causing interference on the connection.
They allow for full-duplex connectivity.
The two strands allow the data to travel for longer distances without degrading.
They increase the speed at which the data can travel.
61
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Places information in the frame that identifies which network layer protocol is being used for
Adds Layer 2 control information to network protocol data.
Controls the NIC responsible for sending and receiving data on the physical medium.
Integrates various physical technologies.
62
Which topology provides high availability and connects some, but not all, remote sites?
point-to-point
hub and spoke
mesh
partial mesh
63
What action will occur if a host receives a frame with a destination MAC address it does not recognize?
The host replies to the switch with its own IP address.
The host forwards the frame to all other hosts.
The host returns the frame to the switch.
The host will discard the frame.
