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Wednesday, September 2, 2015

Roll No……..
Total No. of Questions: 08

M. Tech. (ECE) (Sem.-1st)
Subject Code: EC-503
Paper ID: [E0563]

Time: 3 Hrs.                                                                 Max. Marks: 100
Instruction to Candidates:
1.     Attempt any FIVE questions out of EIGHT questions.
2.     Each question carry TWENTY marks.

(a) What is Data Communication? What are the possible ways of Data transmission and explain with examples? Draw a block diagram of Data Communication system and explain its components.
(b) What are the various characteristics that define the effectiveness of a data communication system? Explain.
(a)  Differentiate between Synchronous and Asynchronous data transmission with the help of suitable examples.
(b) What are the various strategies for dealing with the errors in a network? Explain each with the help of suitable example.
(a)  The following character encoding is used in a data link protocol:
A:01000111;  B:11100011; FLAG; 01111110; ESC: 11100000
Show the bit sequence transmitted (in binary) for the four-character frame: A B ESC FLAG when each of the following framing methods are used:
(i)                Character count
(ii)             Flag bytes with byte stuffing
(iii)           Starting and ending flag bytes, with bit stuffing
(b) A bit string, 0111101111101111110, needs to be transmitted at the data link layer.  What is the string actually transmitted after bit stuffing?
(c)  Data link protocols almost always put the CRC in a trailer rather than in a header. Why?
(a)What do you mean by Multiplexing? What is its use? Explain the different types of Multiplexing along with their advantages and disadvantages.
(b) Differentiate between datagram and virtual circuit approaches for packet-switching.
(a)  What are the various types of LAN access control methodologies?
(b) With the help of necessary flow chart explain the working of  CSMA/CD.
(a)  Differentiate between IPv4 and IPv6.
(b) Compare and Contrast OSI and TCP/IP models.
(a)  What are the differences between message confidentiality and message integrity? Can you have one without the other? Justify your answer?
(b) What is the difference between an active and a passive intruder?
(c) What is the difference between a symmetric key system and a public key system?
(d) What is a key distribution center? What is a certificate authority?
(e) What is the main-in-the-middle attack? Can this attack occur when a symmetric keys are used?
(a)  Which file system is used in the following operating systems:
(i)                Windows NT.
(ii)             Linux
(iii)           Unix
(b) What is the size of ATM cell? Explain in detail the ATM header for the user-subnet interface and for the internal subnet.
(c) Some organizations use firewalls to isolate groups of users internally. Give example of ways that internal firewalls can improve network performance and example of ways internal firewalls can degrade network performance.




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