NATIONAL OPEN UNVERSITY OF NIGERIA
Plot91, University Village Cadastral Zone, Nnamdi Azikiwe Express Way,Jabi-Abuja.
FACULTY OF SCIENCE AND TECHNOLOGY
Course Title: CIT722 – Computer Networks Credit Unit: 3
Instruction: Answer Question One and three others Time: 3hrs
Question One
Q1a). Briefly discuss the following hardware components:
i. Switches (2marks)
ii. Repeaters (2marks)
iii.Bridges (2marks)
iv. Routers (2marks)
Q1b).Describe circuit switching and block switching (6marks)
Q1c) Discussnetwork operating system? (5marks)
Q1d). Advantages and disadvantage of a client/server network (6marks)
Question Two
Q2a). Mention and briefly discuss any three common network topologies (6marks)
Q2b). Describe Internet Control Message Protocol (ICMP) (6marks)
Q2c). Briefly explain the following:
i. Network adapter cards (1mark)
ii. Network hub (1mark)
iii. Network cables (1mark)
Question Three
Q3a).List five types of protocol with specific examples (5marks)
Q3b)Discuss the concept ofDHCP (Dynamic Host Configuration Protocol) (5marks)
Q3c)What are the properties protocols. (5marks)
Question Four
Q4a)Compare and contrast the functions of Carrier Sense on Multi-Access Networks(CSMA) and Carrier Sense Multiple Access with Collision Detect (CSMA/CD). (10mrks)
Q4b) Explain the principles of Peer to Peer Network Model. (5marks)
Question Five
Q5a) What are the configuration steps required for the installation of Windows 2000 professional? (2marks)
Q5b) Define vividly the concept of Protocol and explain briefly the key elements of this concept (8marks)
Q5c) What are the benefits of the OSI model (5marks)
Question Six
Q6a) Mention and explain all the seven layers of OSI model. (7marks)
Q6b) Characteristics of the OSI 7 layers model (4marks)
Q6c)Discuss the workings of TCP/IP model (4marks)
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