Basic Computer Networks Questions and Answers

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Q201
The maximum data rate of a channel of 3000-Hz bandwidth and SNR of 30 dB is
  • A 15, 000 bps
  • B 60, 000 bps
  • C 30, 000 bps
  • D 3, 000 bps
Answer: Option C
Q202
If the bit string 0111101111101111110 is subjected to bit stuffing for the flag string 01111110. the output string is
  • A 0111101111100111111010
  • B 01111011111011111100
  • C 01111011111011111010
  • D 0111101111101111110
Answer: Option A
Q203
The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.
  • A Residual Error rate
  • B Transfer failure probablity
  • C Connection release failure probability
  • D Connection establishment failure probability
Answer: Option A
Q204
In session layer, during data transfer, the data stream responsible for the control purpose (i.c. control of the session layer itself) is
  • A regular data
  • B typed data
  • C capability data
  • D expedited data
Answer: Option C
Q205
The minimum number of bits required to represent B is
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option C
Q206
The minimum number of bits required to represent all the symbols together is
  • A 14
  • B 11
  • C 12
  • D 15
Answer: Option C
Q207
The average code length of the given problem is
  • A 2
  • B 2.25
  • C 2.45
  • D 3
Answer: Option B
Q208
In cryptography, the following uses transposition ciphers and the keyword in LAYER. Encrypt the following message. (Spaces are omitted during encryption) WELCOME TO NETWORK SECURITY !
  • A WMEKREETSILTWETCOOCYONRU !
  • B EETSICOOCYWMEKRONRUILTWET
  • C LTWETONRU ! WMEKRCOOCYEETSI
  • D ONRU ! COOCYLTWETEETSIWMEKR
Answer: Option B
Q209
Encrypt NEKEWNINRROGTTI using the above keyword in Transposition cipher method.
  • A INTERWORKINGNET
  • B INTERNETWORKING
  • C WORKINGINTERNET
  • D None of the above
Answer: Option B
Q210
Assuming that for a given network layer implementation, connection establishment overhead is 100 bytes and disconnection overhead is 28 bytes. What would be the minimum size of a packet the transport layer needs to keep up, if it wishes to implement a datagram service above the network layer and needs to keep its overhead to a maximum of 12.5%.(Ignore transport layer overhead.)
  • A 512 bytes
  • B 768 bytes
  • C 1152 bytes
  • D 1024 bytes
Answer: Option D

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