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SIXTH SEMESTER (CUCBCSS—UG) DEGREE EXAMINATION, MARCH 2021
Computer Science
BCS 6B 13—COMPUTER NETWORKS
(2017 Admissions)
Time : Three Hours Maximum : 80 Marks
Section A

Answer all questions.
Each question carries 1 mark.

Define Internet.

How many layers are there in OSI Reference model ?
What is VRC ?

Expand CSMA/CA.

Give the name of any two routing algorithms.

How many bits are used in IPv4 addressing schemes ?
What is SNMP ?

What is remote login ?

What is digital signature ?

What is cryptography ?

نم وا 60 م @ ‎ರಾ‏ = 0..@

5-5
5

(10 x 1 = 10 marks)
Section B

Answer at least four questions.

Each question carries 4 marks.

All questions can be attended.
Overall Ceiling 16.

11. Explain the different network topologies.
12. Differentiate between flow control and error control.

13. What is Gateway ? Explain its function.

Turn over