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National Open University Exam Past Question – CIT311 JUNE/JULY 2013 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA

14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY

JUNE/JULY EXAMINATION

 

COURSE CODE:    CIT311

COURSE TITLE:   Computer Networks

TIME ALLOWED: 3hrs

INSTRUCTION:    Answer any five (5) questions.

 

 

 

QUESTIONS

1a. Give a brief description of  the concept of ring topology.                        (4 marks)

  1. State four (4) requirements for an efficient traffic control mechanism. (12 marks)

 

  1. Write the key function of the following:
i. Bridges (3 marks)
ii. Transport Layer (3 marks)
iii. Routers (2 marks)
iv. Repeaters (3 marks)
v. Datagrams (3 marks)

[

3a. Distinguish between Baseband and Broadband Communication.           (10 marks)

  1. Give 2 regular applications of Integrated Services Digital Network (ISDN)

(4 marks)

 

  1. Electronic mails have become very popular in transferring information, specify any 7 features of this mode of information transfer.

 

5a. Give 2 common problems that can occur in RIP.                                    (4 marks)

  1. c. State any five (5) tasks which a modem can perform. (10 marks)

 

6a. Give the full meaning of the following acronym, PTI, within the context of computer

Networks.                                                                                                  (2 marks)

  1. Describe how the ATM protocol works. (12 marks)

 

  1. Specify the status of the modem indicator light in the following settings:
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  1. a. When receiving a cal (4 marks)
  2. b. If the modem is sending data.                                                        (4 marks)
  3. c. When the modem detects the remote modem’s carrier.                          (4 marks)
  4. d. If the computer is ready to send or receive data.                                    (2 marks)

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