Computer Network - B.Tech 5th Semester Exam., 2017

2017•Semester 2•Civil-CA•End Semester
Aryabhatta Knowledge University, Patna
B.Tech 5th Semester Exam., 2017

Computer Network

Time: 3 hoursCode: 051513Full Marks: 70

Instructions:

  1. The marks are indicated in the right-hand margin.
  2. There are NINE questions in this paper.
  3. Attempt FIVE questions in all.
  4. Question No. 1 is compulsory.
Q.1 Answer any seven of the following questions:[14]

  1. (a) Write any two functions of the session layer in OSI model.

  2. (b) What is Hamming code?

  3. (c) What is the significance of the twisting in twisted-pair cable?

  4. (d) What do you mean by piggybacking?

  5. (e) What is the purpose of the jam signal in CSMA/CD?

  6. (f) What are the advantages of dividing an Ethernet LAN with a bridge?

  7. (g) What does the term 'best effort' mean in context with IP?

  8. (h) Why is there no need of CSMA/CD in a full-duplex switched Ethernet?

  9. (i) How does redundancy facilitate error detection?

Q.2 Solve both questions:[7+7=14]

  1. Describe the architecture and working of ring topology. What are its advantages and disadvantages?

  2. Compare and contrast between the OSI model and the TCP/IP model.

Q.3 Solve both questions:[7+7=14]

  1. Describe the working of fiber-optic cables. Briefly explain different propagation modes used in fiber-optic cables.

  2. Explain Go-Back-N ARQ as a sliding window mechanism for error control.

Q.4 Solve both questions:[7+7=14]

  1. Describe how the two-dimensional parity check is able to detect errors. Consider '1100101100110000110100101101' as the data that is to be sent over the network.

  2. Draw a flowchart and explain the working procedure of the pure ALOHA protocol.

Q.5 Solve this question:[14]

  1. Explain in detail Fast Ethernet. Describe the structure of the physical layer and various implementation types at this layer.

Q.6 Solve this question:[14]

  1. With the help of a neat and labelled diagram, explain the message format of ICMP. Explain various types of ICMP error messages and query messages.

Q.7 Solve both questions:[7+7=14]

  1. What do you mean by layer 2 switching? Explain in detail the functioning of layer 2 switches.

  2. Discuss the functions and the design issues of the network layer in the OSI model.

Q.8 Solve both questions:[7+7=14]

  1. Describe bridge in terms of networking device. What are different types of network bridge?

  2. Differentiate between Static Routing and Dynamic Routing.

Q.9 Explain the following terms:[7x2=14]

  1. (a) Border Gateway Protocol

  2. (b) User Datagram Protocol