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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Q. Which of the following is used in the options field of IPv4 ?

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Q. Which layers of the OSI reference model are host-to-host layers ?

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Q. A network on the Internet has a subnet mask of 255.255.240.0. What is the maximum number of hosts it can handle ?

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

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Q. A Multiplexer combines four 100-Kbps channels using a time slot of 2 bits. What is the bit rate ?

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Q. In a fully connected mesh network with 10 computers, total ______ number of cables are required and ____ number of ports are required for each device.

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Q. In TCP/IP reference model, the job of ____ layer is to permit hosts to inject packets into any network and travel them independently to the destination.

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Q. If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be:

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Q. Optical fiber uses reflection to guide light through a channel, in which angle of incedence is _______ the critical angle.

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Q. An attacker sits between customer and Banker, and captures the information from the customer and retransmits to the banker by altering the information. This attack is called as ..............

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Q. Match the following Layers and Protocols for a user browsing with SSL:

a. Application layer i. TCP
b. Transport layer ii. IP
c. Network layer iii. PPP
d. Datalink layer iv. HTTP

Codes: a b c d

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Q. The maximum size of the data that the application layer can pass on to the TCP layer below is .........

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Q. A packet whose destination is outside the local TCP/IP network segment is sent to ..............

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Q. Distance vector routing algorithm is a dynamic routing algorithm. The routing tables in distance vector routing algorithm are updated ...........

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Q. In link state routing algorithm after the construction of link state packets, new routes are computed using:

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Q. Suppose there are n stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is ..................

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Q. Station A uses 32 byte packets to transmit messages to station B using sliding window protocol. The round trip delay between A and B is 40 milli seconds and the bottleneck bandwidth on the path between A and B is 64 kbps. The optimal window size of A is

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