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June 2002

Filed under:

Question Paper of CS-09 - Data Communication & Network of June 2002 from IGNOU

1 (i) A digital signalling system is required to operate at 9600 bps. If a signal element en codes 16 bit word, what is the minimum bandwidth required for this channel?

(ii) Describe the various issues related to measuring network performances.

(iii) Using Dijkstra�s routing algorithm, find out a least cost route to all other nodes for nodes 1 through 6 for the following network.

Do the same for Bellman-Ford algorithm. (more…)

December 2001

Filed under:

Question Paper of CS-09 - Data Communication & Network of December 2001 from IGNOU

Time: 3 hours
Maximum Marks: 75

Note: Question 1 is compulsory. Attempt any 3 from the remaining.

1 (a). Describe the salient features of mobile IP.3

(b). Describe the various issues related to measuring network performances.6

©.Identify the range of IP v4 addresses spanned by Class A, Class B and Class C.3 (more…)

June 2001

Filed under:

Question Paper of CS-09 - Data Communication & Network of June 2001 from IGNOU

Time: 2 hours
Max. Marks: 75

Note: Question No 1 is compulsory. Attempt three more questions from questions numbered as 2 to 6.

1.
i. Suppose transmission channels become virtually error free. Is the data link layer still necessary? 3 marks
ii. Explain how the notion of multiplexing can be applied at the data link layer, network layer and transport layer 3 marks
iii. Give two features that the data link layer and transport layer have in common. Give two features in which they differ. 4 marks (more…)

June 2001

Filed under:

Question Paper of CS-09 - Data Communication & Network of June 2001 from IGNOU

Time: 2 hours
Max. Marks: 75

Note: Question No 1 is compulsory. Attempt three more questions from questions numbered as 2 to 6.

1.
i. Suppose transmission channels become virtually error free. Is the data link layer still necessary? 3 marks
ii. Explain how the notion of multiplexing can be applied at the data link layer, network layer and transport layer 3 marks
iii. Give two features that the data link layer and transport layer have in common. Give two features in which they differ. 4 marks
iv. Explain the following Sliding Window Protocol GO BACK n with example 5 marks (more…)

Jan 2001

Filed under:

Question Paper of CS-09 - Data Communication & Network of Jan 2001 from IGNOU

1 (i) Suppose that the Aloha Protocol is used to share a 56 Kbps satellite channel. Suppose that packets are 1000 bits long. Find the maximum throughput of the system in packets/second. [7]

(ii) Does Ethernet provide connection oriented or connectionless service? How is the transfer of frames in Ethernet similar to the transfer of frames in a packet switching network? How is it different? [5]

(iii) What difference does it make to the network layer if the underlying data link layer provides a connection oriented service versus a connectionless service? [5]
(more…)

Dec 2000

Filed under:

Question Paper of CS-09 - Data Communication & Network of Dec 2000 from IGNOU

1 (i) A television screen is composed of a grid of 525 lines by 700 columns (total of 367.500 pixels). A pixel can be black or white (1 or 0). Thirty complete screens (frames) are scanned in one second. What is the theoretical bandwidh required? [7]

(ii) Given a 10 bit sequence 1010011110 and a divisor 1011. Find the CRC. [4]

(iii) Given a remainder of 111, a data unit of 10110011 and a divisior of 1001, is there an error in the data unit? [4] (more…)

June 2000

Filed under:

Question Paper of CS-09 - Data Communication & Network of June 2000 from IGNOU

1 (a) Using the Nyquist theorem, calculate the sampling rate for the following analog signals: [8]

� An analog signal with bandwidth 2000 Hz
� An analog signal with frequencies from 2000 to 6000 Hz

(b) What is the minimum number of samples for PCM encoding if the frequency ranges from 1000 to4000Hz? [5] (more…)

Dec 1999

Filed under:

Question Paper of CS-09 - Data Communication & Network of Dec 1999 from IGNOU

1 (a) For the bit stream 100010100 sketch the waveform for Manchester and Differential Manchester Coding and also discuss the advantages of the coding schemes. [5]

(b) The waveform of the following figure belongs to a Manchester coded binary data stream. Determine the beginning and end of bit periods (i.e. extract clock information) and give the data sequence. [6]

© Why should PCM be preferable to DM for encoding analog signals that represent digital data? [4] (more…)

June 1999

Filed under:

Question Paper of CS-09 - Data Communication & Network of June 1999 from IGNOU

1 Consider a half-duplex point to point link using a stop and wait scheme.

(i) What is the effect on line utilization of increasing the message size so that fewer messages will be required? Other factors remain constant. [2]

(ii) What is the effect on line utilization of increasing the number of frames for a constant message size? [2] (more…)

Dec 1998

Filed under:

Question Paper of CS-09 - Data Communication & Network of Dec 1998 from IGNOU

1 (a) Is the Nyquist theorem true for all types of communication channels? [5]

(b) A cable TV system has a number of commercial channels, all of them showing programs and advertisement alternatively. What type of multiplexing is it? Justify your answer. [5]

© Write a C-program fragment to calculate CRC (cyclic redundancy code) for any message using polynomial generator x4+x3+x+1 using modulo �2 arithmetic. [10]
(more…)








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