Q. Consider the following S1 and S2 :

S1 : A hard handover is one in which the channel in the source cell is retained and used for a while in parallel with the channel in the target cell.

S2 : A soft handover is one in which the channel in the source cell is retained and only then the channel in the target cell is engaged.

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Q. How many distinct stages are there in DES algorithm, which is parameterized by a 56-bit key?

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Q. Which of the following algorithms is not a broadcast routing algorithm?

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Q. The period of a signal is 10 ms. What is its frequency in Hertz?

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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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