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NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF MANAGEMENT SCIENCES
JUNE 2013 EXAMINATION

COURSE CODE: MBF 844                                      

COURSE UNITS: 2

COURSE TITLE: COMPUTER NETWORKS AND INTERNET     

TIME ALLOWED:

Instructions:            1. Attempt question Number one (1) and any other two (2).

2. Question number 1 is compulsory and carries 30 marks, while the other questions carry equal marks each

3. Prresent all your points in coherent and orderly manner

Question 1:

  1. Define the following:
  1. Computer network, ii. Hardware, iii. Software, iv. Wide Area Network, v. Personal Area Network, vi. Servers, vii. Operating System, viii. Data Communications, ix. Telecommunication, x. Network management             10marks
  1. List and explain the OSI reference model    10marks
  2. What is the primary difference between the data link layer and the transport?                        5marks
  3. Consider a 3000-Hz signal with a power level of 0.2 and a noise level of 0.0002 watts. Calculate the data rate.          5marks

Question 2:

2a(i).          What is the difference between Token Management and Synchronization?   4marks

  1. Enumerate the three basic components of all signals   3marks
  2. Expatiate the spectrum of a signal   2marks
  3. Define the following terms:

Computer Network

Data Communication   4marks

2b(i).          For what purposes is category 1 -7 twisted pair used for?                             3marks

  1. What is the difference between Terrestrial microwave and Satellite microwave?  4marks

 

Question 3:

  1. State the main characteristics, and disadvantages of circuit-switched network.  5marks

3b(i).          Describe an electronic mail    5marks

ii.   List the two parts of an electronic mail           2marks

iii. what is the difference between analog and digital data   2marks

3c. explain the difference between Centralized and Distributed routing  6marks

 

Question 4:

  1. Illustrate how to locate a document on the Internet.    10marks
  2. Describe the concept of flooding as it relates to routing in computer network.  5marks
  3. State the reasons for interconnecting.  5marks

 

Question 5:

  1. State the major merit and demerit of flooding                                                  6marks
  2. Briefly explain Broadcast Network                                                                  10marks
  3. Explain the concept of cut-through architecture and mention the disadvantage(s) of using this architecture to interconnect devices in network environment.     4marks

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