NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2016 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 Tress topology.                       (6 marks)

Q2b.                Enumerate and explain the various types of Network available.                                                (10 marks)

Q3a.                 Explain what OSI Model refer to                                                                                         (4 marks)

Q3b.                Enumerate an explain the various layers in OSI Model                                                    (16 marks)

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

Q4b.                Using tabular form indicated 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 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)