2004-05 MODEL PAPER

MCA 2.2.1

DATA COMMUNICATIONS AND NETWORKS

First Question is Compulsory

Answer any four from the remaining

Answer all parts of any Question at one place.

Time: 3 Hrs.
Max. Marks: 100

1. Write brief note for the following
a) List typical LAN topologies
b) De facto standard
c) Null Modem
d) burst error
e) RFC
f) DNS
g) Virtual circuit
h) Data gram
i) POP3
j) Leased line

2. a) Distinguish between a local area networks and a wide area network
b) When a party makes a local telephone call to another party, is this a point-to-point or multi point connection: Explain your answer.
c) What is the difference between the communication of data and the communication of information?

3. a) What is meant by a layered protocol? Why are protocols layered?
b) Distinguish between frequency-division multiplexing and time-division multiplexing
c) Distinguish between a carrier signal, a modulating signal and a modulated signal with appropriate diagrams

5. a) Distinguish between interior and exterior protocols
b) List typical control messages defined by ICMP
c) Why did IPv6 eliminate the checksum in the packet header?

6. a) List TCP primitives related to connection management
b) Why are TCP and IP at different layers in the protocol hierarchy?

7. a) Describe the client/server mode of computing
b) What is SMTP? How does it useful to send e-mails?
c) How does anonymous FTP differ from FTP.

8. a) How is the routing information protocol similar to the Bellman-Ford algorithm?
b) How does next- hop routing decrease the number of table entries in a router?