Rr321702-data-and-computer-communications

Set No. 1

Code No: RR321702

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 DATA AND COMPUTER COMMUNICATIONS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain a three layer Model of Communication. (b) What is ISO. Discuss the seven step process of ISO standard.

[6+10]

2. (a) Draw and Explain TCP/IP protocol architecture. (b) Define and Explain ISDN and broad band ISDN.

[8+8]

3. (a) What is bit stuffing? Discuss the applications of data transparency. (b) Explain Logical Link Control (LLC) with an example. 4. Describe the frame format of SONET / SDH.

[10+6] [16]

5. (a) Draw a simple packet switching network and explain how packets are transmitted from one station to another station? (b) How to approach the problem of transmitting data through a packet switching network when the data length is greater than maximum packet size? Discuss in detail about the various options available. [8+8] 6. (a) Distinguish between the local area networks (LANs) and metropolitan area networks (MANs). (b) What are the functions of the lowest layer of IEEE 802 reference model.[10+6] 7. Explain the different services in ISDN connections for end-to-end communication. [16] 8. Explain the adaptive routing technique in circuit-switched networks. ⋆⋆⋆⋆⋆

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[16]

Set No. 2

Code No: RR321702

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 DATA AND COMPUTER COMMUNICATIONS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Draw Simplified Communication model and explain in detail. (b) Write Short notes on transmission media.

[6+10]

2. (a) Describe the asynchronous and synchronous transmission with suitable example for each. (b) Describe the various data link configuration with its comparisons and applications. [10+6] 3. (a) Explain the frame format of HDLC. (b) Describe the characteristics of HDLC.

[8+8]

4. (a) Explain the Statistical TDM with a suitable diagram. (b) Describe the operation of Synchronous TDM with an example.

[10+6]

5. (a) Compare and contrast the various packet switching techniques. (b) What are the different available configuarations for datagrams & virtual circuits? Explain the operation of the same. [8+8] 6. Compare IEEE 802 protocol layer with OSI model.

[16]

7. (a) What are the various fields in LAPD frame format? Explain in detail. (b) What are the various functions of the B-ISDN layers? Explain in detail. [8+8] 8. (a) What are the advantages of virtual paths? (b) Explain the steps involved in call establishment using virtual path in ATM. [6+10] ⋆⋆⋆⋆⋆

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Set No. 3

Code No: RR321702

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 DATA AND COMPUTER COMMUNICATIONS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Describe the relationship between data rate and bandwidth. (b) With diagram, explain the effect of bandwidth on a digital signal.

[6+10]

2. (a) Explain half duplex with neat circuit diagram. (b) Explain ISDN interface with an example.

[6+10]

3. Write short notes on: (a) Characteristics of TCP (b) Comparison between synchronous TDM and statistical TDM. 4. Describe the frame format of SONET / SDH.

[8+8] [16]

5. (a) Draw a simple packet switching network and explain how packets are transmitted from one station to another station? (b) How to approach the problem of transmitting data through a packet switching network when the data length is greater than maximum packet size? Discuss in detail about the various options available. [8+8] 6. Compare IEEE 802 protocol layer with OSI model.

[16]

7. Explain the different services in ISDN connections for end-to-end communication. [16] 8. (a) What are the advantages of virtual paths? (b) Explain the steps involved in call establishment using virtual path in ATM. [6+10] ⋆⋆⋆⋆⋆

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Set No. 4

Code No: RR321702

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 DATA AND COMPUTER COMMUNICATIONS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain with sketch and example the theoretical efficiency and compare with actual transmission efficiency. (b) Compare the shielded and unshielded twisted pair in terms of attenuation and Near end cross talk. (c) Explain the infra-red communication.

[6+5+5]

2. Write Short Notes on :(a) Direct link (b) Time domain concept. (c) Internetworking and Distributed applications. (d) LAN, WAN and narrow band ISDN.

[3+3+5+5]

3. (a) Explain the frame format of HDLC. (b) Describe the characteristics of HDLC.

[8+8]

4. Describe the frame format of SONET / SDH.

[16]

5. Would it be possible to provide a Circuit switched rather than a packet switched implementation of SS7? What would be the relative merits of such an approach? [16] 6. (a) What are the services provided by logical link control (LLC)? (b) Distinguish between the Baseband and Broadband coaxial cable transmission techniques in LANs. [6+10] 7. (a) What kind of connections can be setup over a B-channel transmission structures. Explain them in detail. (b) Distinguish between the ISDN channel based on their channel structures. [8+8] 8. Explain about different congestion control techniques. ⋆⋆⋆⋆⋆

1 of 1

[16]