BE CSE/DCS 411701-511604-6C0092 Data Communication & Computer Networks Sathyabama University Nov 2010

Register Number

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

Course & Branch: B.E-CSE/DCS

Title of the Paper: Data Communication & Computer Networks

Max. Marks: 80

Sub. Code: 411701-511604-6C0092                      Time: 3 Hours

Date: 26/11/2010                                                    Session: AN

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PART - A                (10 X 2 = 20)

Answer ALL the Questions

1.     Identify the five components of a data communication system. 

2.     For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and star topology?

3.     Given a bandwidth of 5000 Hz for an 8-PSK signal, what are the baud rate and bit rate?

4.     What are the advantages and disadvantages of optical fiber as a transmission medium?

5.     Briefly explain about the sliding window flow control.

6.     Compare the mechanism of space division switch and time division switch.

7.     Name the X.25 frame type and their primary functions.

8.     Why is padding necessary for ATM cells?

9.     Find the network address for each address

                (a)    4.23.145.90     (b)   198.76.9.23

10.   Discuss the TCP connection needed in FTP.

PART – B                        (5 x 12 = 60)

Answer All the Questions

11.   Explain with a neat sketch, the functions of the protocols used in each layer of the OSI model and illustrate how communication is taking place between two end systems.

(or)

12.   (a) Give some advantages and disadvantages for each type of network topology.

        (b) Briefly explain the transmission mode.

       

13.   Briefly discuss about four types of redundancy check used in data communications.

(or)

14.   Explain two types of guided media and two types of unguided media transfer in networks.

15.   Describe the analog hierarchies in which group of signals are successively multiplexed onto higher bandwidth lines.

(or)

16.   (a) Briefly mention  different features of SMDS.                     (7)

(b) Explain circuit switching.  Compare it with packet     switching.                                                                                (5)

17.   (a) Contrast the three categories of services provided by ISDN.  Compare the three B-ISDN access methods.                           (8)

        (b) Explain how are flow and error control handled by X.25?(4)   

(or)

18.   Explain in detail about the Asynchronous Transfer Mode and its layer.

19.   Why do you need routing protocols? Explain the operation of any two routing algorithms.

(or)

20.   Explain the concept and component of simple network management  protocol (SNMP).

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