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NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2015 EXAMINATION

COURSE CODE:                                                                              CIT 311                                                                               

COURSE TITLE:                                                                             Computer Networks

DURATION:                                                                                     2 Hours

INSTRUCTIONS:                                                                            Answer any four questions out of six.

 

Q1a.     (i)         What is Networking?                                                                                                    (5 Marks)

            (ii)        Enumerate the goal(s) of networking.                                                                          (6 Marks)

 Q1b.    Briefly explain and indicate the differences between LAN, MAN and WAN.                                 (9 Marks)

 

Q2a.     (i)        What is Topology?                                                                                                          (4 Marks)

            (ii)         Explain the differences between a Star topology and a Tree topology.                 (6 Marks)

 Q2b.    Enumerate and explain the various types of network available.                                                (10 Marks)

 

Q3a.     Explain what the OSI Model refer to.                                                                                         (4 Marks)

Q3b.     Enumerate and explain the various layers in an OSl Model.                                                       (16 Marks)

 

Q4a.                 Briefly explain the TCP Reference Model. (6 Marks)

Q4b.     Using tabular form, indicate the differences between OSI Reference Model and TCP Reference Model.          (14 Marks)

 

Q5a.   (i)          With reference to Computer network. Define the term Transmission                                 (2 Marks)

            (ii)        Enumerate and explain the various modes of transmission available.                                 (6 Marks)

 Q5b.    What is Multiplexing? Enumerate and explain the various types of multiplexing.                  (12 Marks)

 

Q6a.     (i)         What is the Routing Algorithm?                                                                                       (4 Marks)

            (ii)         Enumerate typical routing protocols and their associated network operating systems are.  (8 Marks)

 Q6b.    What is Internetworking? List any five Network Infrastructure Devices and explain any three.  (8 Marks)

 


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