Cisco CCNA PREPARATION TEST 2026
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● 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.
● 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
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● 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.
● 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
