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SIXTH SEMESTER B.Sc. DEGREE EXAMINATION, MARCH/APRIL 2018
(CUCBCSS—UG)

Computer Science
BCS 6B 14—COMPUTER NETWORKS
Time : Three Hours Maximum : 80 Marks
I. Answer ail questions. Each question carries 1 mark :
1 CSMA stands for i
is the connectionless, unreliable transport protocol.

is a client server general purpose application program for remote logging.
If the physical links are shared by more than two nodes, it is said to be Multiple Access.

2
3
4
5

The minimum number of wires needed to send data over a serial communication layer is

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The data unit in the TCP/IP application layer is called

is designed to provide communications between two mobile stations or between one
mobile unit and one land unit.

8 The algorithm that manages the tables and makes the routing decisions is called ————.
9 The number of bits in an IPV4 address is
10 SMTP stands for

(10 x 1 = 10 marks)
II. Answer all questions. Each question carries 2 marks :
11 How does a single bit error differ from burst error ?
19 How is a hub related to a repeater ?
18 What are the two flow control mechanisms used in data link layer ?
14 What are different types of errors that will occur in data transmission ?
15 What do you mean by congestion ?
"(6 x 2= 10 marks)
111. Answer any five questions. Each question carries 4 marks :
16 Explain error detection and error correction with the help of an example.
17 What is NAT ? How can NAT help in address depletion ? നത്ത്‌

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