VTU Computer Communication Networks - December 2012 Exam Question Paper

VTU Electronics and Communication Engineering (Semester 7)
Computer Communication Networks
December 2012

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Describe the ISO OSI reference model of a computer network. Discuss the function of each layer.

10 M

1 (b) Describe the SS7 service and its relation to the telephone network.

5 M

1 (c) Distinguish between a DSL modem and a DSLAM.

5 M

2 (a) Differentiate between character stuffing and bit stuffing with examples.

5 M

2 (b) Explain different HDLC frames.

5 M

2 (c) What are sliding window protocols? Explain Go-Back-N protocol for Noisy channel.

10 M

3 (a) Compare pure ALOHA with slotted ALOHA. What are the reasons for poor channel utilization in ALOHA system? How the same is improved in CSMA.

8 M

3 (b) Discuss the concepts of
(i) 1-persistent CSMA
(ii) Non-persistent CSMA

8 M

3 (c) Explain the working of CSMA/CD. Suppose a point to point link is set up between earth and rover on MARS. The distance from earth to mars is approximately 55 Gm and data travels over the link at a speed of light 3 × 10⁸ m/s. calculate the minimum round trip propagation time.

6 M

4 (a) Compare the data rates for standard Ethernet, fast Ethernet, Gigabit Ethernet and ten Gigabit Ethernet.

4 M

4 (b) What is the difference between a unicast, multicast, and broad cast address? Define the type of the following destination addresses:
(i) 4A:30:10:21:10:1A
(ii) 47:20:1B:2E:08:EE
(iii) FF:FF:FF:FF:FF:FF

8 M

4 (c) Explain the following with respect to FAST Ethernet.
(i) Implementation
(ii) Encoding
(iii) 100 BASE-TX
(iv) 100 BASE-FX

8 M

5 (a) Explain the following connecting devices:
(i) Repeater
(ii) Bridge
(iii) Router
(iv) Gateway

8 M

5 (b) What is spanning tree? Explain with suitable example.

8 M

5 (c) What is VLAN? Explain.

4 M

6 (a) Explain the address formats for IPV4 and IPV6 address?

8 M

6 (b) List the classes in classful addressing and define the application of each class.

8 M

6 (c) What is NAT? How can NAT help in address depletion?

4 M

7 (a) What is the difference between a direct and an indirect delivery?

4 M

7 (b) List and explain three forwarding techniques.

8 M

7 (c) Explain dynamic routing table.

8 M

8 (a) Compare the TCP header and the UDP header. List the field in the TCP header that are missing from UDP header. Give the reason of their absence.

8 M

8 (b) What are the three domains of domains name space? Explain

8 M

8 (c) How does recursion resolution differ from iterative resolution?

4 M

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