MCS-042 December 2018

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1. (a) State Nagle's algorithm and explain how does it reduce the wastage of bandwidth

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1. (b) Consider the following network. Apply Dijkstra's algorithm to compute the shortest path from A to all the network nodes. Show all the intermediate calculations. What are the drawbacks of this algorithm ?

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1. (c) Draw NRZ-I and Manchester encoding for 0100110 bit stream.

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1. (d) Obtain expression for throughput in ALOHA and Slotted ALOHA. How does the Slotted ALOHA improve the performance over Pure ALOHA ?

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1. (e) Differentiate between Leaky bucket and Token bucket.

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1. (f) Find the CRC for data polynomial x4 + x2 + x + 1 where generator polynomial is x3 + 1.

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2. (a) Explain DES algorithm with an example.

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2. (b) Differentiate between synchronous, asynchronous and isochronous transmission.

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2. (c) What is the reason for a minimum frame length in IEEE 802.11 ?

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3. (a) Explain the purpose of the following fields of the TCP header format :

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3. (b) Explain the concept of Sliding Window protocol with the help of a diagram. Also explain how does Sliding Window protocol Go-Back-N increase the utilization of bandwidth compared to Stop and Wait protocol.

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3. (c) Differentiate between Symmetric key cryptography and Asymmetric key cryptography.

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4. (a) Explain hidden station and exposed station problems in wireless LAN protocols with the help of examples.

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4. (b) Why is packet fragmentation needed in IP ?

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4. (c) Discuss ethernet frame format (802.3).

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5. (a) Explain Diffie-Hellman algorithm with the help of an example.

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5. (b) Discuss the features of Twisted pair cable, Baseband co-axial cable, Broadband co-axial cable and Optical fiber.

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