DCCN PRE-FINAL IMP QUESTIONS.

 1.      Discuss the functions of various layers of OSI Model and compare with TCP/IP model

2.      a) Compare ADSL,VDSL,HDSL and SDSL Technologies.

b) Compare circuit switching and packet switching.

3.      a) What are the functions of the Data link layer? Explain stop and wait protocol.

b) Briefly explain ALOHA,CSMA,CSMA/CD,CSMA/CA protocols and compare its performances.

4.      a) Explain Architecture ,layers  and frame format of SONET.

b) Compare frame relay and ATM networks.

5.      What is logical addressing? Give the services and header format of IPV4 and compare with IPV6.

6.       a) Explain the main categories of DNS Messages.

 b) Explain briefly about ICMP.

7.      Explain the following

            a) Electronic mail        b) Voice over IP                      c) HTTP

            d) FTP                           e) Remote login.

8.      a)  Compare TCP,UDP and SCTP protocols.

b) What is congestion and explain any one of the congestion control mechanism.