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Tuesday, 25 August 2020

IGNOU MCA MCS-042 term-end exam notes,upcoming guess papers,important questions free download

IGNOU MCA MCS-042 4th semester term-end examination (DATA COMMUNICATION AND
COMPUTER NETWORKS) books/block,term-end exam notes,upcoming guess paper,important questions,study materials,previous year papers download.
IGNOU MCA MCS-042 term-end exam notes,upcoming guess papers,important questions free download



IGNOU BCA/MCA all semester new revised (1st semester,2nd semester,3rd semester,4th semester,5th semester and 6th semester) solved assignments,term-end exam notes,study materials,important questions,books/blocks (June-December) free download.

                                                          Notes-1



1. (a) Consider the following network with the indicated link cost. Use Dijkstra's shortest path algorithm to compute the shortest path from the source node A to the destination node D.


(b) In a Slotted Aloha system, it is observed that the channel is empty for 10% of the time. What is its throughput ?
(c) Explain the Diffie-Hellman method for key exchange, through an example.
(d) Explain why Sliding Window protocol is useful in satellite links.
(e) In ISO-OSI reference model, what are the functions of transport layer ?

2. (a) Explain the frame format in Ethernet protocol. Why is minimum frame length specified in this protocol ?
(b) Compare byte stuffing and bit stuffing.Consider the following data frame. Bit stuff it so that the data does not contain the flag 0111 1110.
0001111110100110001111111100

3. (a) Explain the slow-start procedure in TCP.How is threshold set in this ?
(b) How is hidden station problem solved in wireless networks ? What is the use of NAV in IEEE 802.11 protocol ?

4. (a) Explain the operation of Reverse path forwarding algorithm. What is the purpose of the algorithm ?
(b) Explain RSA public key algorithm with an example.

5. (a) Draw TCP header format and discuss the use of different flags.
(b) Find CRC for data polynomial x4 + x2 + x + 1 with generator polynomial x3 + 1.

                                                    Notes-2


1. (a) Consider the following network with the indicated link cost. Use Dijkstra's shortest path algorithm to compute the shortest path from source node 1 to the network node 5.




(b) Explain the RSA algorithm using an example.
(c) What are the functions of Data Link Layer ? How is error correction carried out at this layer ?
(d) Illustrate congestion detection and congestion avoidance phases in TCP.
(e) Why are RTS and CTS used in IEEE 802.11 protocol ?

2. (a) What is the purpose of PCM ? Explain the different components of PCM encoder. How are quantization levels chosen in PCM ?
(b) Why is sliding window protocol useful in satellite links ? Illustrate GO-BACK-N and SELECTIVE REPEAT protocols.

3. (a) How does token bucket traffic shaper work ? Explain with the help of a diagram.
(b) Discuss the addressing classes in IP. Why is subnet masking used in IP addressing ?

4. (a) Derive an expression for throughput in Slotted Aloha. Why is this system unstable ?
(b) What is Nagle's algorithm ? How does it reduce the wastage of bandwidth ?

5. (a) Why is fragmentation used in IP ? Illustrate OSPF.
(b) How is connection established in TCP ? Illustrate multiplexing in TCP.

                                                   Notes-3


1.(a) Illustrate CSMA/CD Protocol. Also explain Backoff algorithm.
(b) Explain the concept of bit stuffing through an appropriate example.
(c) If a binary signal is sent over 30 MHz and whose signal to noise ratio is 30dB, what is the maximum achievable channel capacity.
(d) Explain encryption and decryption process in Triple DES.
(e) Define Multiplexing. Explain TDM (synchronous and statistical both) in detail with the help of suitable diagram.
(f) Illustrate constellation diagram of 8 - PSK and 8 QAM.
(g) Draw polar NRZ - L and NRZ - I encoding for the following bit stream.01001110

2.(a) Explain various steps in process of Analog to Digital Modulation.
(b) Define CRC. Explain its purpose with suitable example.
(c) Differentiate between Adaptive and Non Adaptive Routing.

3. (a) Describe Interior Gateway Routing Protocol.
(b) Explain structure of Optical Fiber and also write its advantages and disadvantages.
(c) Discuss the process of Local Procedure Call and Remote Procedure Call.

4. (a) Explain operation of Bridges in different LAN environment ?
(b) Define broadcasting. Explain various methods for broadcasting.
(c) Differentiate between Radio Communication and Satellite Communication.

5. (a) Explain RSA algorithm with the help of an example.
(b) Describe Framing. Explain different methods of framing.
(c) Describe Isochronous Communication and Write its advantages and disadvantages.

IGNOU MCA MCS-042 4th semester term-end examination (DATA COMMUNICATION AND
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