6th Sem: Data Communication And Network

6B14CSC: Data Communication and Network

Module I 

            Introduction to data communication, important elements /components of data communication, Data transmission- Analog, Digital. Transmission media- Guided media, Unguided media. Synchronous / Asynchronous data transmission. Line configuration – Simplex, Half duplex, Duplex. Network topologies – star, Bus, ring, Mesh. Computer networks, Use, network hardware, network structure- point to point connection, multicast, broadcast, classification of networks-LAN, WAN, Man. 

Module II 

          Reference models, the OSI reference model, TCP / IP reference model. Comparison between OSI and TCP / Ip models. Data Link Layer , Design issues, Services to network layer, Framing- charater count, character stuffing, bit stuffing, physical layer coding violation. Error control, flow control, Elementary data link protocolsunrestricted simplex protocol, simplex stop and wait protocol, simplex protocol for a noisy channel. 

Module III 

        Network layer, design issues, services to the transport layer, routing algorithmsadaptive, non adaptive algorithms, optimality principle, dijkstras shortest path routing algorithm, flow based routing, hierarchical routing, congestion control algorithms–the leaky bucket algorithm, the token bucket algorithm. 62 BOS Computer Science 2014 Kannur University 

Module IV 

         Transport layer, design issues, connection management-addressing, establishing and releasing connection, transport layer protocols- TCP, UDP. 

Module V 

          Application layer, network security, traditional cryptography, substitution ciphers, transposition ciphers, fundamental principles, secret key algorithm, data encryption standard, DES chaining, DES breaking. Public key algorithm, RSA algorithm. 

Text Book 

A S Tanenbaum . Computer Networks 3rd Edn Pearson Pub.

 References 

1. B Forousan, Introduction to data communication and networking 

2. Data communication and Networks, Achyut S. godbole, TMH 

3. Computer Networks – fundamentals and Applications, Rajesh, Easearakumar & Balasubramaian, Vikas pub. 

Model Question Paper 

 Time: 3 Hours Maximum Mark: 40 

SECTION- A 

1. One Word Answer (8 X 0.5 = 4 marks) 

a. The transfer of data in the form of electrical signals or continuous waves is called ____________. b. The __________ is in between each pair of adjacent layers and defines the primitive operations and services of the lower layer. 

c. The ___________ protocol has neither flow control nor error control. 

d. The network layer deals with __________ transmission. 

e. The coding of data for security is called ____________. 

f. In TCP the connection is established using a technique called _______________. 

g. OSI stands for ____________. 

h. The hierarchical routing uses the idea of dividing routes called ____________. 

SECTION B 

Write short notes on ANY SEVEN of the following questions (7 X 2 = 14 Marks) 

2. What are the design issues of network layer? 

3. What is meant by congestion? 

4. What is cryptography? 

5. List the file transfer protocols. 

6. What is the need of error control? 

7. What is meant by character stuffing? 

8. Explain simplex transmission. 

9. Define a computer network. 

10. What is meant by parallel transmission? 

11. What is service point addressing?

 SECTION C 

Write short notes on ANY FOUR of the following questions (4 X 3 = 12 Marks) 

12.Explain transposition ciphers. 

13.Compare between TCP and UDP. 

14.Explain flow based routing. 

15.Explain Framing. 

16.What are the functions of presentation layer? 

17.Briefly explain unicast, muticast and broadcast. 

SECTION D 

Write short notes on ANY SEVEN of the following questions (2 X 5 = 10 Marks) 

18.Explain ISO-OSI reference model. 

19.List and explain elementary protocols used in DLL. 

20.Explain different types of routing. 

21.Explain the various methods for providing network security

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