Delays and Loss (Security & Physical Layer) Interview/Exam Question-Answer

Q.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 above

Ans : All of the above

Q.2 For a 10Mbps Ethernet link, if the length of the packet is 32bits, the transmission delay is ____________ (in microseconds).

       A. 3.2

       B. 32

       C. 0.32

       D. 320

Ans : 3.2

Transmission rate = length / transmission rate = 32/10 = 3.2 microseconds.

Q.3 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. Propagation delay

Ans : Processing delay

Q.4 Given L = number of bits in the packet, a = average rate and R = transmission rate. The Traffic intensity in the network is given by ____________

       A. La/R

       B. LR/a

       C. R/La

       D. Ra/L

Ans : La/R

Q.5 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

Ans : 10Mbps

Q.6 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

Ans : N-1

Q.7 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

Ans : dnodal = dproc + dqueue + dtrans + dprop

Q.8 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. Propagation delay

       B. Queuing delay

       C. Transmission delay

       D. Processing delay

Ans : Queuing delay

Q.9 Transmission delay does not depend on _____________.

       A. Packet length

       B. Distance between the routers

       C. Transmission rate

       D. Bandwidth of medium

Ans : Distance between the routers

Q.10 Propagation delay depends on ___________.

       A. Packet length

       B. Transmission rate

       C. Distance between the routers

       D. Speed of the CPU

Ans : Distance between the routers

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