Data Link Layer and Network Communication Quiz

What are two characteristics of fiber-optic cable? (Choose two.)

• It is not affected by EMI or RFI.

• It is more expensive than UTP cabling is.

• 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.

What does the term “attenuation” mean in data communication?

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• • time for a signal to reach its destination

  
  

• • strengthening of a signal by a networking device

• • loss of signal strength as distance increases

• • leakage of signals from one cable pair to another

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 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 sophistication of the encapsulation method applied to the data

• • the bandwidth of the WAN connection to the Internet

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

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

  
  

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)

• crosstalk

• electromagnetic interference

• bandwidth

• size of the network

• signal modulation technique

Refer to the graphic. What type of cabling is shown?

• • fiber

• • STP

• • UTP

• • coax

Refer to the graphic. What type of cabling is shown?

• • UTP

• STP

• coax

• fiber

Which two devices commonly affect wireless networks? (Choose two.)

• incandescent light bulbs

• microwaves

• Blu-ray players

• home theaters

• cordless phones

Which two statements describe the services provided by the data link layer? (Choose two.)

• It provides reliable delivery through link establishment and flow control.

• It defines the end-to-end delivery addressing scheme.

• It maintains the path between the source and destination devices during the data transmission.

• It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.

• It manages the access of frames to the network media.