GTU Electronics and Communication Engineering (Semester 8)
Data Communication And Networking
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Write a short note on Layer1, Layer2 and Layer3 devices in the context of OSI reference model
7 M
1 (b) Explain the four levels of addresses in TCP/IP protocols.
7 M

2 (a) Describe the performance measurement terms for the overall measurement of the network performance
7 M
2 (b) Write a short note on Ethernet.
7 M
2 (c) Write a short note on Bluetooth.
7 M

3 (a) Differentiate the Pure ALOHA and Slotted ALOHA protocols.
7 M
3 (b) Illustrate the techniques in short which are used for achieving Good Quality of Service at Network Layer.
7 M
3 (c) Explain the role of Network Layer in the Internet.
7 M
3 (d) Differentiate the IPv4 and IPv6 in detail
7 M

4 (a) Write a short note on services provided by the TCP at Transport layer.
7 M
4 (b) List the types of DNS messages and explain in detail.
7 M
4 (c) Write a short note on HTTP.
7 M
4 (d) Explain the DES and Triple DES algorithms.
7 M

5 (a) Describe the working of VPN.
7 M
5 (b) Write a short note on IPSec.
7 M
5 (c) Briefly explain the working of PGP.
7 M
5 (d) Write a short note on SSL.
7 M



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