Networking Review Questions ch 4 - 7

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 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 type of traffic that is crossing the network

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.

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

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

• STP

• UTP

• coax

• fiber

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

• crosstalk

• bandwidth

• size of the network

• signal modulation technique

• electromagnetic interference

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

• STP

• UTP

• coax

• fiber

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

• cordless phones

• home theaters

• microwaves

• Blu-ray players

• incandescent light bulbs

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

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

• It ensures that application data will be transmitted according to the prioritization.

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

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

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

What is the function of the CRC value that is found in the FCS field of a frame?

• to verify the integrity of the received frame

• to verify the physical address in the frame

• to verify the logical address in the frame

• to compute the checksum header for the data field in the frame