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Networks - 1

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Number of Questions: 25
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Tags: c programming C pointers Exploring C Arrays Loops Conditions File Handling in C C C++ PHP HTML Data Communication & Networks
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The number of cross points needed for 10 lines in a cross point, which is full duplex in nature and there are no self connections, is

  1. 100

  2. 45

  3. 50

  4. 90


Correct Option: B

Characters per se (7 bits + 1 parity), which can be transmitted over a 2, 400 bps line, if the transfer is synchronous (1 start and 1 stop bit), are

  1. 300

  2. 240

  3. 250

  4. 275


Correct Option: A

Bit snuffing is

  1. inserting a '0' is user data stream to differentiate it with a flag

  2. inserting a '0' in flag stream to avoid ambiguity

  3. appending a nibble to the flag sequence

  4. appending a nibble to the user data stream


Correct Option: A

Directions: This question is based on Huffmain's coding for symbols. A with probability 0.3, B with 0.15, C with 0.1, D with 0.5 and E with 0.2

The minimum number of bits required to represent B is

  1. 1

  2. 2

  3. 3

  4. 4


Correct Option: C

Directions: This question is based on Huffmain's coding for symbols. A with probability 0.3, B with 0.15, C with 0.1, D with 0.5 and E with 0.2

Average code length is

  1. 2

  2. 2.25

  3. 2.45

  4. 3


Correct Option: B

Error detection at data link level is achieved by

  1. bit snuffing

  2. cycle redundancy codes

  3. hemming codes

  4. equalization


Correct Option: B

Directions: This question is based on Huffmain's coding for symbols. A with probability 0.3, B with 0.15, C with 0.1, D with 0.5 and E with 0.2

The minimum number of bits required to represent all the symbols tightly is

  1. 14

  2. 11

  3. 12

  4. 15


Correct Option: C

Which of the following digits are known as area code of Network User Address (NUA)?

  1. 5—7

  2. 1—4

  3. 8—12

  4. 13—14


Correct Option: A

Which one of the following networks uses dynamic or adaptive routing?

  1. TYMNET

  2. ARPANET

  3. SNA (IBM's System Network Architecture)

  4. None of the above


Correct Option: B

Which of the following digits are known as sub-address digits ( for use by the user) of Network User Address?

  1. 5—7

  2. 1—4

  3. 8—12

  4. 13—14


Correct Option: D

Pick the correct statement out of the following statements.

  1. It is a type of isolated routing

  2. It a method in which every incoming packet is sent out on every outgoing line except the one by which it arrived

  3. Flooding does not always select the shortest path

  4. Selective flooding is a type in which the packet are sent to those lines that are going approximately in the right direction


Correct Option: A,B,D

Which of the following digits are known as terminal number of NUA?

  1. 5—7

  2. 1—4

  3. 8—12

  4. 13—14


Correct Option: C

How many digits of NUA are known as DNIC (Data Network Identification Code)?

  1. First 3

  2. First 4

  3. First 5

  4. First 7


Correct Option: B

Manchester code is

  1. bipolar code

  2. non-return to zero code

  3. polar code

  4. none of the above


Correct Option: C

A modem constellation diagram has data points at (0, 1) and (0, 2). What type(s) of modulation does the modem use?

  1. Phase modulation

  2. Amplitude modulation

  3. Both A and B

  4. None of the above


Correct Option: B

End-to-end connectivity is provided from host-to-host in a

  1. network layer

  2. session layer

  3. data link layer

  4. transport layer


Correct Option: D

Error detection at a data link level is achieved by

  1. bit stuffing

  2. cyclic redundance codes

  3. hamming codes

  4. equalization


Correct Option: B

A terminal multiplexer has six 1, 200 bps terminals and 'n' 300 bps terminals connected to it. The outgoing of the line is 9, 600 bps. What is the maximum value of n?

  1. 4

  2. 8

  3. 16

  4. 28


Correct Option: B

The parameter which gives the probability of the transport layer itself spontaneously terminating a connection due to internal problems is called

  1. protection

  2. resilience

  3. option negotiation

  4. transfer failure


Correct Option: B

The maximum number of lines that can be supported in a time division switch, if each memory access takes 100 ns and one frame period is 125 micro seconds, is

  1. 625 lines

  2. 1, 250 lines

  3. 2, 300 lines

  4. 318 lines


Correct Option: A

Maximum data rate of a channel for a noiseless 3 KHz binary channel is

  1. 1, 500 bps

  2. 3, 000 bps

  3. 6, 000 bps

  4. none of these


Correct Option: C

4 bits are used for packet sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size?

  1. 4

  2. 8

  3. 15

  4. 16


Correct Option: C

A 6 uHz channel is used by a digital signaling system utilizing 4 level signals. What is maximum possible transmission rate?

  1. 1.5 M band/sec

  2. 6 M band/sec

  3. 12 M band/sec

  4. 24 M band/sec


Correct Option: C

If the bit string 0111101111101111110 is subjected to bit-stuffing for the flag string 01111110, the output string is

  1. 011110111110011111010

  2. 01111011111011111100

  3. 01111011111011111010

  4. 0111101111101111110


Correct Option: A

The maximum data rate of a channel of 3, 000 Hz bandwidth and SNR of 30 db is

  1. 300 bps

  2. 15, 000 bps

  3. 30, 000 bps

  4. 60, 000 bps


Correct Option: C
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