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NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER/NOVEMBER 2016 EXAMINATION

COURSE CODE:                                                                              CIT 311                                                                               

COURSE TITLE:                                                                             Computer Networks

DURATION:                                                                                     2 Hours, 30 Minutes

INSTRUCTIONS:                                                                            Answer any five questions. Cordless nonprogrammable calculators may be used.

 

Q1a.     Write brief notes on the following network types:

  1. Wide Area Network
  2. Local Area Network

Q1b.    Briefly describe three main applications of a computer network

 

Q2a.     Using sketches describe three different types of network topologies.

Q2b.    Briefly describe the OSI Reference model listing all its layers in their proper order.

 

Q3a.     Briefly describe the following:

            i.          IEEE Standard 802.3 Ethernet

            ii.         IEEE Standard 802.3 Ethernet

 

Q4a.     Explain what transmission medium is using three examples to illustrate.

Q4b.    Distinguish between Data Rate and Bandwidth.

 

Q5a.     Briefly describe two sliding window techniques.

Q5b.    write brief notes on each of the following routing algorithms:

            i.          Shortest Path routing

            ii.         Flooding

 

Q6a.     Briefly explain the main factors that bring about network congestion.

Q6b.    Write a brief note on each of the following:

            i.          Modem

            ii.         Bridge

iii.        Hub

iv.        Repeater

 

Q7a.     Briefly describe the concept of Quality of Service (QoS).

Q7b.    Briefly describe the format of a TCP Header.


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