NWC 204 MODULE 4 - 7 EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026
What is the purpose of the OSI physical layer?
controlling access to media
transmitting bits across the local media
performing error detection on received frames
exchanging frames between nodes over physical network media - Answers transmitting bits across
the local media
Why are two strands of fiber used for a single fiber optic connection?
The two strands allow the data to travel for longer distances without degrading.
They prevent crosstalk from causing interference on the connection.
They increase the speed at which the data can travel.
They allow for full-duplex connectivity. - Answers They allow for full-duplex connectivity.
Which characteristic describes crosstalk?
the distortion of the network signal from fluorescent lighting
the distortion of the transmitted messages from signals carried in adjacent wires
the weakening of the network signal over long cable lengths
the loss of wireless signal over excessive distance from the access point - Answers the distortion of
the transmitted messages from signals carried in adjacent wires
Which procedure is used to reduce the effect of crosstalk in copper cables?
requiring proper grounding connections
twisting opposing circuit wire pairs together
wrapping the bundle of wires with metallic shielding
designing a cable infrastructure to avoid crosstalk interference
avoiding sharp bends during installation - Answers twisting opposing circuit wire pairs together
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 - Answers the amount of traffic
that is currently crossing the network.
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.
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 combines the technique of cancellation, shielding, and twisting to protect data.
It typically contains 4 pairs of fiber-optic wires.
It is more expensive than UTP cabling is. - Answers It is not affected by EMI or RFI.
It is more expensive than UTP cabling is.
What is a primary role of the Physical layer in transmitting data on the network?
create the signals that represent the bits in each frame on to the media
provide physical addressing to the devices
determine the path packets take through the network
, control data access to the media - Answers create the signals that represent the bits in each frame on
to the media
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the
cable pairs?
the magnetic field around the adjacent pairs of wire
the use of braided wire to shield the adjacent wire 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 - Answers the magnetic
field around the adjacent pairs of wire
In addition to the cable length, what two factors could interfere with the communication carried over
UTP cables? (Choose two.)
crosstalk
bandwidth
size of the network
signal modulation technique
electromagnetic interference - Answers crosstalk
electromagnetic interference
Which two devices commonly affect wireless networks? (Choose two.)
Blu-ray players
home theaters
cordless phones
microwaves
incandescent light bulbs
external hard drives - Answers cordless phones
microwaves
Which two statements describe the services provided by the data link layer? (Choose two.)
It defines the end-to-end delivery addressing scheme.
It maintains the path between the source and destination devices during the data transmission.
It manages the access of frames to the network media.
It provides reliable delivery through link establishment and flow control.
It ensures that application data will be transmitted according to the prioritization.
It packages various Layer 3 PDUs into a frame format that is compatible with the network interface. -
Answers It manages the access of frames to the network media.
It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.
What is the function of the CRC value that is found in the FCS field of a frame?
to verify the integrity of the received frame
to verify the physical address in the frame
to verify the logical address in the frame
to compute the checksum header for the data field in the frame - Answers to verify the integrity of
the received frame
What is contained in the trailer of a data-link frame?
logical address
physical address
data
error detection - Answers error detection
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 vary depending on protocols.
They include information on user applications. - Answers They vary depending on protocols.
What is the purpose of the OSI physical layer?
controlling access to media
transmitting bits across the local media
performing error detection on received frames
exchanging frames between nodes over physical network media - Answers transmitting bits across
the local media
Why are two strands of fiber used for a single fiber optic connection?
The two strands allow the data to travel for longer distances without degrading.
They prevent crosstalk from causing interference on the connection.
They increase the speed at which the data can travel.
They allow for full-duplex connectivity. - Answers They allow for full-duplex connectivity.
Which characteristic describes crosstalk?
the distortion of the network signal from fluorescent lighting
the distortion of the transmitted messages from signals carried in adjacent wires
the weakening of the network signal over long cable lengths
the loss of wireless signal over excessive distance from the access point - Answers the distortion of
the transmitted messages from signals carried in adjacent wires
Which procedure is used to reduce the effect of crosstalk in copper cables?
requiring proper grounding connections
twisting opposing circuit wire pairs together
wrapping the bundle of wires with metallic shielding
designing a cable infrastructure to avoid crosstalk interference
avoiding sharp bends during installation - Answers twisting opposing circuit wire pairs together
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 - Answers the amount of traffic
that is currently crossing the network.
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.
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 combines the technique of cancellation, shielding, and twisting to protect data.
It typically contains 4 pairs of fiber-optic wires.
It is more expensive than UTP cabling is. - Answers It is not affected by EMI or RFI.
It is more expensive than UTP cabling is.
What is a primary role of the Physical layer in transmitting data on the network?
create the signals that represent the bits in each frame on to the media
provide physical addressing to the devices
determine the path packets take through the network
, control data access to the media - Answers create the signals that represent the bits in each frame on
to the media
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the
cable pairs?
the magnetic field around the adjacent pairs of wire
the use of braided wire to shield the adjacent wire 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 - Answers the magnetic
field around the adjacent pairs of wire
In addition to the cable length, what two factors could interfere with the communication carried over
UTP cables? (Choose two.)
crosstalk
bandwidth
size of the network
signal modulation technique
electromagnetic interference - Answers crosstalk
electromagnetic interference
Which two devices commonly affect wireless networks? (Choose two.)
Blu-ray players
home theaters
cordless phones
microwaves
incandescent light bulbs
external hard drives - Answers cordless phones
microwaves
Which two statements describe the services provided by the data link layer? (Choose two.)
It defines the end-to-end delivery addressing scheme.
It maintains the path between the source and destination devices during the data transmission.
It manages the access of frames to the network media.
It provides reliable delivery through link establishment and flow control.
It ensures that application data will be transmitted according to the prioritization.
It packages various Layer 3 PDUs into a frame format that is compatible with the network interface. -
Answers It manages the access of frames to the network media.
It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.
What is the function of the CRC value that is found in the FCS field of a frame?
to verify the integrity of the received frame
to verify the physical address in the frame
to verify the logical address in the frame
to compute the checksum header for the data field in the frame - Answers to verify the integrity of
the received frame
What is contained in the trailer of a data-link frame?
logical address
physical address
data
error detection - Answers error detection
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 vary depending on protocols.
They include information on user applications. - Answers They vary depending on protocols.
