Q. For n devices in a network, ____ , number of duplex-mode links are required, for a mesh topology.

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Q. How many characters per second (7 bits + 1 parity) can be transmitted over a 3200 bps line if the transfer is asynchronous? (Assuming 1 start bit and 1 stop bit)

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Q. Which of the following is not a field in TCP header ?

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Q. What is the propagation time if the distance between the two points is 48,900 ? Assume the propagation speed to be 2.4 x 108 meter/second in cable.

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Q. _________________ is a bit-oriented protocol for communication over point-to-point and multi-point links . 

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Q. Which one of the following is true for asymmetric-key cryptography?

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Q. A Trojan horse is

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Q. In substitution, a character in the plaintext is always changed to the same character in the ciphertext, regardless of its position in the text

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Q. Using data p=3, q=11, n=pq, d=7 in RSA algorithm find the cipher text of  the given plain text SUZANNE

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Q. Which of the following protocols is an application layer protocol that establishes, manages and terminates multimedia sessions?

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Q. Match the following port numbers with their uses :

(a) 23 (i) World wide web
(b) 25 (ii) Remote Login
(c) 80 (iii) USENET news
(d) 119 (iv) Email

code (a)  (b)  (c)  (d)

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Q. Which of the following is not associated with the session layer ?

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Q. What is the size of the 'total length' field in IPv4 datagram ?

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Q. Which of the following is/are restriction(s) in classless addressing ?

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Q. The process of dividing an analog signal into a string of discrete outputs, each of constant amplitude, is called :

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Q. Which transmission technique guarantees that data packets will be received by the receiver in the same order in which they were sent by the sender?

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Q. Which of the following control fields in TCP header is used to specify whether the sender has no more data to transmit?

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Q. Which are the two modes of IP security?

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Q. A message "COMPUTERNETWORK" encrypted (ignore quotes) using columnar transposition cipher with a key "LAYER". The encrypted message is :

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Q. Suppose a digitized voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it is assumed that each sample requires 8 bits?

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