Delays and Loss - Computer Networks Questions and Answers

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1.

Which of the following delay is faced by the packet in travelling from one end system to another ?

   A.) Propagation delay
   B.) Queuing delay
   C.) Transmission delay
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

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2.

The time required to examine the packet’s header and determine where to direct the packet is part of

   A.) Processing delay
   B.) Queuing delay
   C.) Transmission delay
   D.) All of the mentioned

Answer: Option 'A'

Processing delay

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3.

In the transfer of file between server and client, if the transmission rates along the path is 10Mbps, 20Mbps, 30Mbps, 40Mbps. The throughput is usually

   A.) 20Mbps
   B.) 10Mbps
   C.) 40Mbps
   D.) 50Mbps

Answer: Option 'B'

The throughput is generally the transmission rate of bottleneck link.

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4.

The total nodal delay is given by

   A.) dnodal = dproc – dqueue + dtrans + dprop
   B.) dnodal = dproc + dtrans – dqueue
   C.) dnodal = dproc + dqueue + dtrans + dprop
   D.) dnodal = dproc + dqueue – dtrans – dprop

Answer: Option 'C'

dnodal = dproc + dqueue + dtrans + dprop

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5.

Transmission delay does not depend on

   A.) Packet length
   B.) Distance between the routers
   C.) Transmission rate
   D.) None of these

Answer: Option 'B'

Distance between the routers

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6.

Propagation delay depends on

   A.) Packet length
   B.) Transmission rate
   C.) Distance between the routers
   D.) None of the mentioned

Answer: Option 'C'

Propagation delay is the time it takes a bit to propagate from one router to the next.

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7.

In a network, If P is the only packet being transmitted and there was no earlier transmission, which of the following delays could be zero

   A.) Propogation delay
   B.) Queuing delay
   C.) Transmission delay
   D.) Processing delay

Answer: Option 'B'

Queuing delay

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8.

If end to end delay is given by dend-end = N(dproc + dtrans + dprop) is a non congested network. The number of routers between source and destination is

   A.) N/2
   B.) N
   C.) N-1
   D.) 2N

Answer: Option 'C'

N-1

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9.

Traffic intensity is given by, where L = number of bits in the packet a = average rate R = transmission rate

   A.) La/R
   B.) LR/a
   C.) R/La
   D.) None of these

Answer: Option 'A'

La/R

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10.

For a 10Mbps Ethernet link, if the length of the packet is 32bits, the transmission delay is(in milliseconds)

   A.) 3.2
   B.) 32
   C.) 0.32
   D.) None of these

Answer: Option 'A'

3.2

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