M.C.A-M.C.A 3rd Sem IT - 32 : 302 : DATA COMMUNICATION AND COMPUTER NETWORKS(University of Pune, Pune-2013)

M.C.A. (Semester - III) (Management Faculty) Examination, 2013

IT - 32 : 302 : DATA COMMUNICATION AND COMPUTER NETWORKS

(2008 Pattern)

Time : 3 Hours                                                            Max. Marks : 70

Instructions : i) Q.1 and Q.8 are compulsory.

ii) Attempt any four from remaining.

1. a) Justify with true or false (not more than 60 words).            10

i) HTTP uses a TCP connection to transfer files.

ii) Router operates at Data link layer.

 iii) ICMP is a transport layer protocol.

iv) Shared medium environment are collision domains.

v) A cable break in bus topology network does not affect network communications.

b) What are the purpose of ARP, RARP, ICMP and IGMP of IP layer ? Explain.

2. Why layered approach of networking model developed ? What are the advantages of layered model ?

     Explain the process of Data Encapsulation in layered model.

3. a) Describe the meaning and purpose of DNS. Explain name resolution and inverse resolution.

b) Explain DHCP address discovery process, address renewed process and address release process.

4. What are the reasons the network designers create subnetting ? Explain reason for using supernetting.

     Determine the network, subnetwork and host addresses if IP address is 42.56.29.13 and subnet mask is 255.255.240.0.

5. Define topology. How does the number of attached computer affect a bus topology network ?

    Explain the operation of ring topology network.

6. Define SMTP. Explain with example the function of SMTP and POP.

7. Define and explain public key and symmetric key signatures. Explain different types of network threats.

8. Write short notes (any 2) :

a) Proxy server

b) Vsat

c) Design issues of wireless Lan requirement

d) FTP.

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