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Ollscoil na hÉireann, Gaillimh GX_____
National University of Ireland, Galway
Autumn Examinations, 2009/
Exam Code(s) 3BF
Exam(s) 3 rd^ Business Information Systems
Module Code(s) MS
Module(s) Networks & Communications
Paper No. Repeat Paper 1 Special Paper
External Examiner(s) Dr. D. Ivanov Internal Examiner(s) Dr. T. Acton Dr. A. Nachev
Instructions: Answer three questions. All questions carry equal marks.
Duration 2 hrs No. of Answer books
Requirements : Handout MCQ Statistical Tables Graph Paper Log Graph Paper Other Material
No. of Pages Department(s)
3 rd^ YEAR BUSINESS INFORMATION SYSTEMS
MS216 NETWORKS AND COMMUNICATIONS
Time Allowed: TWO hours
Answer THREE questions. All questions carry equal marks.
Q1.
With respect to application layer of the TCP/IP communication model, write notes on the following: (a) Outline File Transfer Protocol (FTP) as a client-server application. Briefly discuss the FTP components and connections between them. (10 Marks)
(b) World Wide Web (WWW) can be viewed as a client-server application. Briefly outline its components and their role. Outline the protocol(s) that govern the WWW and illustrate how clients and servers communicate by request and response messages. (18 Marks)
(c) What is meant by the Google’s Page Rank system? (5 Marks)
Q2.
(a) “E-mail systems are based on a store-and-forward model in which a server accepts, forwards, delivers and stores messages on behalf of users.” Discuss above statement. Describe how e-mail functions as a client- server application. Outline its components, their interaction, and protocols that govern the service. (21 Marks)
(b) Briefly describe how Web-based e-mail operates in the light of a client- server application. (9 Marks)
(c) With respect to mailing list servers, distinguish between reflector and processor. (3 Marks)
