ExamsSCHOOL OF SCIENCE AND TECHNOLOGY

National Open University Exam Past Question – CIT722 JUNE/JULY EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA CIT722 COMPUTER NETWORKS

14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY JUNE/JULY EXAMINATION

 

COURSE CODE:   CIT722

COURSE TITLE:  COMPUTER NETWORKS TIME ALLOWED: 3 Hours

INSTRUCTION:    Answer Any Five Questions

 

 

1a. b.

 

c.

What is Network Operating System?

Differentiate between peer-to-peer network operating

system and client-server network operating system. In networking, what does the term topology refer to?

5 marks

 

5 marks

4 marks

 

2a. b.

 

What is a network protocol?

Explain in brief the key elements of a protocol.

 

5 marks

9 marks

 

3a. b.

 

Distinguish between the OSI model and TCP/IP model. State the characteristics of the OSI 7 layer model.

 

8 marks

6 marks

 

4a. b. c.

 

What are the types of media used in LANs?

Explain what is meant by line-of-sight communication.

List two disadvantages of wireless LANs.

 

6 marks

4 marks

4 marks

 

5a.

 

Why is the OSI reference model so named?

 

4 marks

  1. State the five principles that are applied to arrive at the seven OSI layers.

10 marks.

 

6a.       Assume that hosts A and B have a TCP connection established. Assume that the two hosts are separated by one router (i.e., they are one hop apart).

Why does host A not directly use the MAC (LAN) address of

host B when constructing its packets to send to host B?                                   8

marks

  1. An Ethernet frame has 8 bytes of 10101010b in the preamble.

What is the purpose of this preamble?                                                  6 marks

 

  1. Outline the four principal network topologies and discuss their

reliability.                                                                                             14 marks

YOU MAY ALSO LIKE  National Open University Exam Past Question – SED835 MAY/JUNE 2013 EXAMINATION

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Close