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Ollscoil na hÉireann, Gaillimh _GX______
National University of Ireland, Galway
Semester I Examinations, 2008/
Exam Code(s) 1BD 2BD
Exam(s) H.Dip in Systems Analysis full-time H.Dip in Systems Analysis part-time 2nd year
Module Code(s) MS
Module(s) Operating Systems, Networks & Telecommunications
Paper No. 1 Repeat Paper Special Paper
External Examiner(s) Professor Hans van der Heijden Internal Examiner(s) Professor J. F. Collins 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)
OLLSCOIL NA hÉIREANN
NATIONAL UNIVERSITY OF IRELAND, GALWAY
HIGHER DIPLOMA IN SYSTEMS ANALYSIS
MS850 OPERATING SYSTEMS, NETWORKS & TELECOMMUNICATIONS
Time Allowed: TWO hours
Answer THREE questions. All questions carry equal marks.
Q1.
(a) With respect to representation of information convert -11 10 (a negative decimal number) to two’s complement notation using bit patterns of length 8. Give a brief explanation of your solution. (8 Marks)
(b) When information is transmitted, bit patterns may change, which causes errors. A variety of coding techniques have been developed to allow detection and even correction of errors.
Discuss the above statement. (10 Marks)
(c) With respect to computer system components distinguish between each of the following pairs of terms:
i) Supercomputer vs. mainframe. ii) Primary storage vs. secondary storage. iii) SRAM memory vs. DRAM memory. iv) Level one (L1) vs. level two (L2) cache memory. v) Universal Serial Bus (USB) port vs. FireWire (IEEE 1394) port.
Q4.
(a) With respect to computer networks , distinguish between each of the following pairs of terms:
i) Client-server local area networks (LANs) vs. peer-to-peer LANs. ii) Physical star topology vs. logical star topology. iii) Half-duplex vs. full-duplex mode of transmission. iv) Radio-frequency (RF) wireless LANs vs. Bluetooth personal area networks (PANs). (16 Marks)
(b) With respect to long-distance wireless communications discuss the main features of the following systems:
i) Second generation (2G) cellular phone networks. ii) Satellite navigation systems. (17 Marks)
Q5. The Open System Interconnection (OSI) model defines seven layers that describe how applications running upon network devices may communicate with each other. With respect to the OSI model, answer the following questions:
(a) What is a peer-to-peer process? What are headers and trailers and how do they get added and removed? (5 Marks)
(b) What are the responsibilities of the physical, data link, network, and transport layers? (18 Marks)
(c) What is the difference between a service-point (port) address, a logical address, and a physical address? (5 Marks)
(d) What is the purpose of translation by the presentation layer? (2 Marks)
(e) Name some services provided by the application layer.
