Period: 10 - INT: Chapter 4

What are two reasons for physical layer protocols to use frame encoding techniques?

• to reduce the number of collisions on the media

• to distinguish data from control information

• to provide better media error correction

• to identify where the frame starts and ends

• to increase the media throughput

What is indicated by the term throughput?

• the guaranteed data transfer rate offered by an ISP

• the capacity of a particular medium to carry data

• the measure of the usable data transferred across the media

• the measure of the bits transferred across the media over a given period of time

What is the definition of bandwidth?

• the measure of the transfer of bits across the media over a given period of time

• the speed at which bits travel on the network

• the amount of data that can flow from one place to another in a given amount of time

• the measure of usable data transferred over a given period of time

A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption?

• EMI

• crosstalk

• RFI​

• signal attenuation

• extended length of cabling

Which characteristic describes crosstalk?

• the distortion of the network signal from fluorescent lighting

• the distortion of the transmitted messages from signals carried in adjacent wires

• the weakening of the network signal over long cable lengths

• the loss of wireless signal over excessive distance from the access point

What technique is used with UTP cable to help protect against signal interference from crosstalk?

• twisting the wires together into pairs

• wrapping a foil shield around the wire pairs

• encasing the cables within a flexible plastic sheath

• terminating the cable with special grounded connectors

Which type of connector does a network interface card use?

• DIN

• PS-2

• RJ-11

• RJ-45

What is one advantage of using fiber optic cabling rather than copper cabling?

• It is usually cheaper than copper cabling.

• It is able to be installed around sharp bends.

• It is easier to terminate and install than copper cabling.

• It is able to carry signals much farther than copper cabling.

Why are two strands of fiber used for a single fiber optic connection?

• The two strands allow the data to travel for longer distances without degrading.

• They prevent crosstalk from causing interference on the connection.

• They increase the speed at which the data can travel.

• They allow for full-duplex connectivity.

A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose 3.)

• mobility options

• security

• interference

• coverage area

• extensive cabling