NATIONAL OPEN UNIVERSITY OF NIGERIA
University Village, 91 Cadastral Zone, Nnamdi Azikwe Expressway, Jabi, Abuja
FACULTY OF SCIENCE
DEPARTMENT OF COMPUTER SCIENCE
JULY 2018 EXAMINATIONS
CIT461: Internet Architecture and Communications Credit Units: 2
Instruction: Answer Question one (1) (25marks) and any other three (3) questions each carrying 15 marks Time: 2 hours
1a) Write short notes on Web browsers (4 marks)
b) Briefly explain the concept of “Data Packets” (6 marks)
c) What do you understand by Packet Switching Networks (1½ marks)
d) Name and briefly explain the Packet Switching systems/protocols known to you.
( 6½ marks)
e) (i) Name the key requirement for internet connections. (1 mark)
(ii) List the main elements that affect the key requirement named in (i) above in internet connections. (2 marks)
(iii) State the issues whose resolution should be included in the overall calculation of the key requirement named in (i) above for your Internet connections. (4 marks)
2a) In view of the different requirements for E-business and the possible threats to E business, many different forms of security exist for e-businesses.
(i) List the areas of general security guidelines for e-businesses. ( 2 marks)
(ii) Write short notes on any three of the areas. (9 marks)
b) Write short notes on HTML. (4 marks)
3) Write short notes on the following broadband connections stating their advantages and disadvantages:
a) Dial-Up Connection – 56K (5 marks)
b) ISDN (5 marks)
c) Frame Relay (5 marks)
4a) What is Web Design? (2 marks)
b) List six and give an example each, of software tools that can be used for creating a website? (4½ marks)
c) For the typical web sites, explain the basic aspects of design. (6 marks)
d) What are Web Services? (2½ marks)
5a) Explain the types of Web pages known to you. (5 marks)
b) Discuss how a Web Search Engine works (7 marks)
c) What do you understand by the term “Internet”? (3 marks)
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