CSIS330 Module 7:
Ethernet Concepts Exam
Questions, answer choices, highlighted correct answers, and
explanations
Study note: Correct answers are highlighted in green. Questions 3 and 30 are not included.
Question 1
In addition to the cable length, what two factors could interfere with the communication
carried over UTP cables? (Choose two.)
○ signal modulation technique
✓ electromagnetic interference
○ bandwidth
✓ crosstalk
○ size of the network
Why: UTP can be disrupted by outside electromagnetic noise and by signals leaking between nearby wire
pairs.
Question 2
Match the situation with the appropriate use of network media.
Situation Correct network media
Horizontal cabling structure ✓ UTP cable
Desktop PCs in an enterprise office ✓ UTP cable
Backbone cabling in an enterprise ✓ Fiber-optic cable
Long-haul networks ✓ Fiber-optic cable
Guest access in a coffee shop ✓ Wireless
Waiting rooms in a hospital ✓ Wireless
Why: UTP is common for short indoor Ethernet runs, fiber is preferred for backbones and long distances,
and wireless supports mobile guest access.
Question 4
A network administrator is measuring the transfer of bits across the company backbone for
a mission-critical financial application. The network throughput appears lower than the
CSIS 330 - Business Data Communications Systems
, expected bandwidth. Which three factors could influence the difference 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 reliability of the gigabit Ethernet infrastructure of the backbone
○ the bandwidth of the WAN connection to the Internet
Why: Actual throughput is affected by traffic load, traffic type, and delays introduced along the path.
Question 5
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk
within the cable pairs?
○ the collision caused by two nodes trying to use the media simultaneously
✓ the magnetic field around the adjacent pairs of wire
○ the reflection of the electrical wave back from the far end of the cable
○ the use of braided wire to shield the adjacent wire pairs
Why: The signal in one pair creates an electromagnetic field that can induce an unwanted signal in an
adjacent pair.
Question 6
What are two characteristics of fiber-optic cable? (Choose two.)
○ Each pair of cables is wrapped in metallic foil.
✓ It is not affected by EMI or RFI.
✓ It is more expensive than UTP cabling is.
○ It typically contains 4 pairs of fiber-optic wires.
○ It combines the technique of cancellation, shielding, and twisting to protect data.
Why: Fiber carries light rather than electrical signals, making it immune to EMI/RFI, but it generally costs
more than UTP.
Question 7
What is a characteristic of the LLC sublayer?
✓ It places information in the frame allowing multiple Layer 3 protocols to use the same network
interface and media.
○ It provides delimitation of data according to the physical signaling requirements of the medium.
○ It provides the logical addressing required that identifies the device.
○ It defines software processes that provide services to the physical layer.
Why: The LLC sublayer identifies the Layer 3 protocol carried in the frame, allowing protocols such as IPv4
and IPv6 to share the same interface.
CSIS 330 - Business Data Communications Systems
Ethernet Concepts Exam
Questions, answer choices, highlighted correct answers, and
explanations
Study note: Correct answers are highlighted in green. Questions 3 and 30 are not included.
Question 1
In addition to the cable length, what two factors could interfere with the communication
carried over UTP cables? (Choose two.)
○ signal modulation technique
✓ electromagnetic interference
○ bandwidth
✓ crosstalk
○ size of the network
Why: UTP can be disrupted by outside electromagnetic noise and by signals leaking between nearby wire
pairs.
Question 2
Match the situation with the appropriate use of network media.
Situation Correct network media
Horizontal cabling structure ✓ UTP cable
Desktop PCs in an enterprise office ✓ UTP cable
Backbone cabling in an enterprise ✓ Fiber-optic cable
Long-haul networks ✓ Fiber-optic cable
Guest access in a coffee shop ✓ Wireless
Waiting rooms in a hospital ✓ Wireless
Why: UTP is common for short indoor Ethernet runs, fiber is preferred for backbones and long distances,
and wireless supports mobile guest access.
Question 4
A network administrator is measuring the transfer of bits across the company backbone for
a mission-critical financial application. The network throughput appears lower than the
CSIS 330 - Business Data Communications Systems
, expected bandwidth. Which three factors could influence the difference 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 reliability of the gigabit Ethernet infrastructure of the backbone
○ the bandwidth of the WAN connection to the Internet
Why: Actual throughput is affected by traffic load, traffic type, and delays introduced along the path.
Question 5
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk
within the cable pairs?
○ the collision caused by two nodes trying to use the media simultaneously
✓ the magnetic field around the adjacent pairs of wire
○ the reflection of the electrical wave back from the far end of the cable
○ the use of braided wire to shield the adjacent wire pairs
Why: The signal in one pair creates an electromagnetic field that can induce an unwanted signal in an
adjacent pair.
Question 6
What are two characteristics of fiber-optic cable? (Choose two.)
○ Each pair of cables is wrapped in metallic foil.
✓ It is not affected by EMI or RFI.
✓ It is more expensive than UTP cabling is.
○ It typically contains 4 pairs of fiber-optic wires.
○ It combines the technique of cancellation, shielding, and twisting to protect data.
Why: Fiber carries light rather than electrical signals, making it immune to EMI/RFI, but it generally costs
more than UTP.
Question 7
What is a characteristic of the LLC sublayer?
✓ It places information in the frame allowing multiple Layer 3 protocols to use the same network
interface and media.
○ It provides delimitation of data according to the physical signaling requirements of the medium.
○ It provides the logical addressing required that identifies the device.
○ It defines software processes that provide services to the physical layer.
Why: The LLC sublayer identifies the Layer 3 protocol carried in the frame, allowing protocols such as IPv4
and IPv6 to share the same interface.
CSIS 330 - Business Data Communications Systems
