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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Q. The maximum payload of a TCP segment is :

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Q. In a binary Hamming Code the number of check digits is r then number of message digits is equal to :

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Q. In a digital transmission, the receiver clock is 0.1 percent faster than the sender clock. How many extra bits per second does the receiver receive if the data rate is 1 Mbps?

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Q. Match the following cryptographic algorithms with their design issues:
List-I                                        List-II

a. DES                              i.  Message Digest

b. AES                              ii.  Public Key

c. RSA                              iii. 56-bit key

d. SHA-1                          iv. 128-bit key

Codes:
a       b       c       d

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Q. Ten signals, each requiring 3000 Hz, are multiplexed on to a single channel using FDM. How much minimum bandwidth is required for the multiplexed channel ? Assume that the guard bands are 300 Hz wide.

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Q. A terminal multiplexer has six 1200 bps' terminals and 'n' 300 bps terminals connected to it. If the outgoing line is 9600 bps, what is the value of n ?

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