VTU Computer Networks 1 - June 2012 Exam Question Paper

VTU Computer Science (Semester 5)
Computer Networks 1
June 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) What is data communication? What are the four important fundamental characteristics?

6 M

1 (b) What is protocol? Briefly explain its key elements.

5 M

1 (c) Explain the responsibilities of transport layer in OSI reference model.

9 M

2 (a) Define bandwidth. A periodic signal has bandwidth of 20Hz. The highest frequency is 60Hz. What is the lowest frequency? Draw the spectrum if the signal contains all frequencies of the same amplitude.

4 M

2 (b) Calculate the Shanon channel capacity in the following cases:
(i) Bandwidth=20 kHz SNR_dB=40;
(ii) Bandwidth = 200 kHz SNR_dB=6

6 M

2 (c) Define line coding. Describe unipolar NR2, polar NR2-L, bipolar AMI and Manchester encoding by applying on the information sequence 101011100.

10 M

3 (a) An analog signal has a bit rate of 8000 bps and a band rate of 1000 band. How many data elements are carried by each signal elements? How many signal elements do we need?

5 M

3 (b) Explain the phase modulation with a neat diagram.

5 M

3 (c) What is time division multiplexing? Explain how statical TDM overcomes the disadvantages of synchronous TDM.

10 M

4 (a) Briefly explain the coaxial cable and optical fiber with their applications.

8 M

4 (b) Find the codeword, using CRC given data word "1001" and generator "1011".

8 M

4 (c) What is internet checksum? With an example list the steps undertaken by the sender and receiver for error detection.

6 M

5 (a) Explain selection repeat ARQ with neat diagrams.

8 M

5 (b) What is piggybacking? List its usefulness.

4 M

5 (c) Explain the frame format and transitional phases of point-to-point protocol.

8 M

6 (a) A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the troughout if the system products 100 frames per second.

6 M

6 (b) With a neat diagram explain CSMA/CD protocol.

8 M

6 (c) Explain the MAC sublayer of gigabit Ethernet

6 M

7 (a) Explain the architecture of IEEE 802.11.

8 M

7 (b) Differentiate between repeater and amplifire.

2 M

7 (c) How does a VLAN reducer network traffic?

4 M

7 (d) Differentiate between bus backbone and star backbone.

6 M

8 (a) Explain in detail, the architecture of SONET system.

10 M

8 (b) Give the architecture of ATM. Show how VPs and VCs are established.

6 M

8 (c) Write a short note on AMPS.

4 M

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