04-02 Physical Layer - QA

Question 1

What are three functional areas addressed by physical layer standards?

Answer 1

1. physical components
2. encoding
3. signalling

Question 2

The way in which bits are represented on the media is known as <BLANK></BLANK>

Answer 2

signalling method

Question 3

What factors determine the practical bandwidth of a network

Answer 3

1. properties of the physical media
2. technologies chosen for signaling and detecting network signals

Question 4

What three factors influence throughput?

Answer 4

1. amount of traffic
2. type of traffic
3. the latency created by the number of devices encountered between source and destination

Question 5

What is the BEST way to counter EMI/RFI?

Answer 5

1. wrap cable in metalling shielding
2. require properly grounded connections

Question 6

What is the BEST way to counter crosstalk?

Answer 6

twist opposing wire pairs together

Question 7

How can one limit the susceptibility of copper wires to EMI/RFI?

Answer 7

1. select a suitable cable type/category for the job
2. design cable infrastructure to avoid known/potential sources
3. use cabling techniques that include proper handling/termination

Question 8

When using UTP cable specifically, how can crosstalk be limited?

Answer 8

1. cancellation (twists in wire pairs)
2. vary the number of twists in wire pairs