NWC204 MODULE 4 - 7 (EXAM NETACAD) 2026 UPDATE
| QUESTIONS AND ANSWERS | WITH COMPLETE
SOLUTION
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 Answer -
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. Answer - 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
Answer - 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 Answer - 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 Answer -
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. Answer - 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 Answer - 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?
| QUESTIONS AND ANSWERS | WITH COMPLETE
SOLUTION
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 Answer -
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. Answer - 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
Answer - 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 Answer - 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 Answer -
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. Answer - 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 Answer - 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?
