CCNA 1 V7.0 MODULES 4 - 7: ETHERNET CONCEPTS EXAM QUESTIONS AND ANSWERS
2025
What is the purpose of the OSI physical layer? - (ANSWER)transmitting bits across the local media*
Why are two strands of fiber used for a single fiber optic connection? - (ANSWER)They allow for full-
duplex connectivity.*
Which characteristic describes crosstalk? - (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? - (ANSWER)twisting
opposing circuit wire pairs together*
Match the situation with the appropriate use of network media. - (ANSWER)* copper cables - horizontal
cabling structure / desktop PCs in an enterprise office
*fiber optic - backbone cabling in an enterprise / long-haul networks
*wireless - guest access in a coffee shop / waiting rooms in a hospital
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? -
(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? - (ANSWER)It is not affected by EMI or RFI(crosstalk) /
It is more expensive than UTP cabling is
What is a primary role of the Physical layer in transmitting data on the network? - (ANSWER)create the
signals that represent the bits in each frame on to the media.
Explanation: The OSI physical layer provides the means to transport the bits that make up a frame across
the network media. This layer accepts a complete frame from the data link layer and encodes it as a
series of signals that are transmitted to the local media.
, CCNA 1 V7.0 MODULES 4 - 7: ETHERNET CONCEPTS EXAM QUESTIONS AND ANSWERS
2025
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable
pairs? - (ANSWER)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? - (ANSWER)crosstalk / electromagnetic interference
Which two devices commonly affect wireless networks? - (ANSWER)cordless phones / microwaves
Which two statements describe the services provided by the data link layer? - (ANSWER)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? - (ANSWER)to verify the
integrity of the received frame
What is contained in the trailer of a data-link frame? - (ANSWER)error detection
Which statement describes a characteristic of the frame header fields of the data link layer? -
(ANSWER)They vary depending on protocols.
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? -
(ANSWER)partial mesh
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? - (ANSWER)Frame Check Sequence / minimum frame size
Which media communication type does not require media arbitration in the data link layer? -
(ANSWER)full-duplex
2025
What is the purpose of the OSI physical layer? - (ANSWER)transmitting bits across the local media*
Why are two strands of fiber used for a single fiber optic connection? - (ANSWER)They allow for full-
duplex connectivity.*
Which characteristic describes crosstalk? - (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? - (ANSWER)twisting
opposing circuit wire pairs together*
Match the situation with the appropriate use of network media. - (ANSWER)* copper cables - horizontal
cabling structure / desktop PCs in an enterprise office
*fiber optic - backbone cabling in an enterprise / long-haul networks
*wireless - guest access in a coffee shop / waiting rooms in a hospital
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? -
(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? - (ANSWER)It is not affected by EMI or RFI(crosstalk) /
It is more expensive than UTP cabling is
What is a primary role of the Physical layer in transmitting data on the network? - (ANSWER)create the
signals that represent the bits in each frame on to the media.
Explanation: The OSI physical layer provides the means to transport the bits that make up a frame across
the network media. This layer accepts a complete frame from the data link layer and encodes it as a
series of signals that are transmitted to the local media.
, CCNA 1 V7.0 MODULES 4 - 7: ETHERNET CONCEPTS EXAM QUESTIONS AND ANSWERS
2025
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable
pairs? - (ANSWER)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? - (ANSWER)crosstalk / electromagnetic interference
Which two devices commonly affect wireless networks? - (ANSWER)cordless phones / microwaves
Which two statements describe the services provided by the data link layer? - (ANSWER)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? - (ANSWER)to verify the
integrity of the received frame
What is contained in the trailer of a data-link frame? - (ANSWER)error detection
Which statement describes a characteristic of the frame header fields of the data link layer? -
(ANSWER)They vary depending on protocols.
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? -
(ANSWER)partial mesh
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? - (ANSWER)Frame Check Sequence / minimum frame size
Which media communication type does not require media arbitration in the data link layer? -
(ANSWER)full-duplex
