ITS 1 - LEARN - Chapter 04

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Flashcards	23
Language	English
Category	Computer Science
Level	Other
Created / Updated	12.10.2015 / 14.11.2016
Licencing	Not defined
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Flip-Mode

What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

to reduce the number of collisions on the media

to distinguish data bits from control bits

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

the time it takes for a message to get from sender to receiver

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? (Choose two.)

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

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?â€‹

1 – rollover, 2 – crossover, 3 – straight-through

1 – rollover, 2 – straight-through, 3 – crossover

1 – crossover, 2 – straight-through, 3 – rollover

1 – crossover, 2 – rollover, 3 – straight-through