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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Q. Let G(x) be generator polynomial used for CRC checking. The condition that should be satisfied by G(x) to correct odd numbered error bits, will be:

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Q. In a packet switching network, if the message size is 48 bytes and each packet contains a header of 3 bytes. If 24 packets are required to transmit the message, the packet size is ................

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Q. A node X on a 10 Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2 Mbps. Token bucket is initially filled with 16 megabits. The maximum duration taken by X to transmit at full rate of 10 Mbps is ............ secs.

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Q. Which of the following statements is not true with respect to microwaves?

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