Basic CS-Networks (3i Infotech Papers): Sample Questions 1 - 2 of 90

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Question number: 1

» Basic CS » Networks

MCQ▾

Question

Piggy backing is a technique for

Choices

Choice (4) Response

a.

Flow control

b.

Acknowledgement

c.

Sequence

d.

Retransmission

Answer

b.

Explanation

In two way communication when the data frame is received, receiver waits and does not send the acknowledgement back to the sender immediately. The receiver waits until its network layer passes in the next data packet. The delayed acknowledgement is then attached to this outgoing data frame. This technique of temporarily delaying the acknowledgement so that it can go with next outgoing data frame is known as piggybacking. The major advantage of piggybacking is better use of available channel bandwidth.

Question number: 2

» Basic CS » Networks

Short Answer Question▾

Write in Short

What is attenuation?

Explanation

  • Degeneration of a signal over distance on a network cable is called attenuation (physical characteristic of the medium like cable).

  • Attenuation refers to reduction in the strength of a signal.

  • Historically measured in dB but it can also be measured as voltage.

  • Applies to both hard-wired and wireless transmissions.

Different types of attenuation include:

  • Deliberate attenuation occurs where a volume control is used to lower the sound level on electronics.

  • Automatic attenuation is a common feature of televisions and other audio equipment to prevent sound distortion by automatic level sensing.

  • Environmental attenuation relates to signal power loss due to the transmission medium.