4.3 Physical Network Media (Doshi)

Question 1

What is attenuation?

Answer 1

Is the weakening of signals during transmission.

Question 2

Where does attenuation exist?

Answer 2

In both wired and wireless transmission. Length of wire impacts the severity of attenuation.

Question 3

Electromagnetic Interference (EMI):

Answer 3

A disturbance generated by an external source that affects an electric circuit.

Question 4

What caused EMI?

Answer 4

Electric storms or noisy electrical equipment.

Question 5

Cross-talsk

Answer 5

Crosstalk is electromagnetic interference from one unshielded twisted pair to another twisted pair, normally running in parallel.

Question 6

Fiber optic cables

Answer 6

proven to be more secure than the other media. They have very low transmission loss, not affected by EMI and preferred choice for high volumes and long distance calls.

Question 7

What is a diverse routing

Answer 7

The method of routing traffic through split-cable facilities or duplicate facilities

Question 8

Where is an alternate routing?

Answer 8

The method of routing information via an alternative

medium, such as copper cable or fiber optics is called alternate routing.

Question 9

What is the difference between last mile and long haul?

Answer 9

Last mile provide redundancy for local loop whereas long haul provide redundancy for long distance availability

Question 10

In any given situation, fiber-optic cables have proven to

Answer 10

be more secure than the other media. They have very low transmission loss, not affected by EMI and preferred choice for high volumes and long distance calls.

Question 11

When CISA question is about transmission error that can occur in wired as well as wireless communication,

Answer 11

our answer should be attenuation.

Question 12

It is essential to understand the difference between diverse routing and

Answer 12

alternate routing.

Question 13

The method of routing traffic through split-cable facilities or duplicate-cable facilities is called

Answer 13

diverse routing.

Question 14

Whereas the method of routing information via an alternative medium, such as copper cable or fiber optics is called

Answer 14

alternate routing.

Question 15

Also, CISA aspirant should be able to differentiate between last mile and

Answer 15

long haul.

Question 16

Last mile provide redundancy for local loop whereas

Answer 16

long haul provide redundancy for long distance availability.

Question 17

5)It is also very critical to understand the meaning of terms such as attenuation, EMI and

Answer 17

cross talks:

Question 18

(i)Attenuation:

Answer 18

• Attenuation is the weakening of signals during transmission.
• Attenuation exists in both wired and wireless transmissions.
• Length of wire impacts the severity of attenuation.

Question 19

(ii)Electromagnetic Interference (EMI):

Answer 19

• EMI is a disturbance generated by an external source that affects an electrical circuit.
• The disturbance may degrade the performance of the circuit or even stop it from functioning. In the case of a data path, these effects can range from an increase in error rate to a total loss of the data.
• EMI is caused by electrical storms or noisy electrical equipments (e.g. motors, fluorescent lighting, radio transmitters etc.)

Question 20

(iii)Cross-Talks:

Answer 20

Crosstalk is electromagnetic interference from one unshielded twisted pair to another twisted pair, normally running in parallel.