PPSC Past Papers MCQs

PPSC Past Papers Most Repeated — 741 MCQs (Page 23 of 75)

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A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the requirement to make this frame collision-free?

A. 2msec
B. 4msec
C. 2sec
D. 4sec

A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 1000 frames per second?

A. 150 frames
B. 80 frames
C. 135 frames
D. 96 frames

A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 500 frames per second?

A. 146 frames
B. 92 frames
C. 38 frames
D. 156 frames

A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 250 frames per second?

A. 38 frames
B. 48 frames
C. 96 frames
D. 126 frames

A slotted ALOHA network transmits 200-bit frames using a shared channel with a 200-kbps bandwidth. Find the throughput if the system (all stations together) produces 500 frames per second.

A. 92 frames
B. 368 frames
C. 276 frames
D. 151 frames

A network using CSMA/CD has a bandwidth of 10 Mbps. If the maximum propagation time (including the delays in the devices and ignoring the time needed to send a jamming signal, as we see later) is 25.6 μs, what is the minimum size of the frame?

A. 128 bytes
B. 32 bytes
C. 16 bytes
D. 64 bytes

In collision free protocol channel efficiency is given by-

A. D/(d + log2(n))
B. D*(d + log2(n))
C. Log2(n)
D. (d + log2(n))

Which network topology does this represent?

A. Mesh
B. Star
C. Bus
D. Ring

‘Jitter’ refers to-

A. Errorless delivery
B. Variation in the packet arrival time
C. Timely delivery of message
D. None of the mentioned

2 Half duplex systems can make a Full-Duplex.

A. True
B. False
C.
D.

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