Basic CS-Networks [3i Infotech Placement]: Sample Questions 88 - 89 of 90

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Question 88

Networks

Question

MCQ▾

Piggy backing is a technique for

Choices

Choice (4)

a.

Flow control

b.

Acknowledgement

c.

Retransmission

d.

Sequence

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 89

Networks
Edit

Describe in Detail

Essay▾

What is Bandwidth?

Explanation

Define Bandwidth
  • Historically it refers to a range within a band of frequencies or wavelengths- A measure of the difference between the highest and lowest frequencies that a medium can transmit.
  • Now the more generally refers to amount of data that can be transmitted in a fixed amount of time.
  • Important for I/O devices.
  • Example a fast disk drive can be hampered by a bus with a low bandwidth.
  • One of the factors that affects network performance.
  • Bandwidth measured in:
    • bps - bits per second
    • kbps - kilobits per second
    • mbps- megabits per second

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