NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2018 EXAMINATION

CIT461:  Internet Architecture and Communications                                 

Credit Units: 2

Instruction: Answer Question (1) (25marks) and any other three questions each carrying 15 marks                                                                         

Time: 2 hours

1a)       What do you understand by the term “Internet”  (3 marks)

b)         Compare TCP and UDP?                               (6 marks)

c)         List and briefly describe the important terminologies in HTTP                     (6 marks)

d)            Distinguish between a Switch and a Hub                               (10 marks)

2a)          Compare domain and workgroup                                                             (6 marks)

b) With the aid of illustrative diagram, explain the levels of ISPs that you considered important for efficient Internet Service Provisioning.    (9 marks)

3a)          Write short notes on the following:

1. Circuit switching systems                           (4 marks)
2. Packet switching systems                           (8 marks)

b)         What is HTML?   (3 marks)

4a)          Describe three (3) Packet Switching Networks known to you                                      (9 marks)

b) Internet connectivity in most organizations and networks today, is no longer an additional option, but a necessity. Discuss stating also the reasons why company employees use the internet. (6 marks)           

5a)       What are Web Services?                                                         (2 marks)

b)         State the typical issues that need to be clarified before Internet connections can be implemented, maintained, and managed in an organization.         (5 marks)

c).        State and briefly explain each Internet Connectivity Requirements you would consider necessary while trying to set up an organization’s Internet.         (8 marks)

6a)       Explain the major Security Concerns within E-Business.         (10 marks)

b)            List and describe user interface elements that can be found on any major web browsers. (5 marks)