Jawaharlal Nehru Technological University Hyderabad 2011-3rd Sem M.C.A Code No: F3302 R09 s- COMPUTER NETWORKS - Question Paper

1. a) What do you mean by physical topology? Compare different network topologies.
b) Bring out the importance of OSI model in computer networking.
2. a) Compare OSI model with TCP/IP model.
b) Compare packet switching, circuit switching and message switching techniques.
3. a) elaborate the advantages of optical fiber cable compared to copper cable.
b) discuss the process of fault detection in block coding.
4. a) Bring out the advantage of hamming codes compared to other linear block codes with suitable example.
b) elaborate the transparency mechanism and delimiting sequence for HDLC?
c) List and define the HDLC operational modes.
5. a) How is a repeater various from an amplifier?
b) How is a hub related to a repeater?
c) How does a VLAN give extra security for a network?
6. a) elaborate the different layers of ATM? discuss.
b) elaborate the different layers of SONET? discuss.
7. a) elaborate the different functions of transport-layer protocols? discuss.
b) Bring out the advantages of UDP over TCP.
8. Write short notes on:
a) Electronic mail
b) FTP
c) WWW
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Earning:   Approval pending.