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Posted By: ram Member Level: Diamond Posted Date: 31 Aug 2008
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2005 Jawaharlal Nehru Technological University Computer Science & Engineering III B.Tech. I Semester Regular Examinations, November -2005 DATA COMMUNICATIONS Question paper
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Code No: RR310503 Set No.2
III B.Tech. I Semester Regular Examinations, November -2005
DATA COMMUNICATIONS
( Common to Computer Science & Engineering, Information Technology
and Computer Science & Systems Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain about Data link layer, Network layer and Transport layer on OSI
model.
(b) What is protocol? [10+6]
2. What are the various types of Data Communication codes and explain briefly about
each code? [16]
3. (a) What is the Difference between selection and polling? And explain.
(b) Explain about Control field on SDLC protocol? [8+8]
4. (a) What is switched Ethernet? And explain.
(b) What is Fast Ethernet? And explain. [8+8]
5. (a) Differentiate between PAP and CHAP.
(b) Give an overview of different switching methods. [8+8]
6. (a) Discuss different types of subscriber loops in ISDN.
(b) Explain the functional groupings used at subscriber’s premises in ISDN. [8+8]
7. (a) How does a frame get retransmitted in frame relay?
(b) Can two devices connected to the same frame relay network use the same
DLCI’s? [10+6]
8. (a) How is an STS-1 frame organized?
(b) What is a virtual tributary?
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