CIT 311 MARCH/APRIL 2013 Examination

                                                                     

                                                                  National Open University of Nigeria

                                                            14-16 Ahmadu Bello Way, Victoria Island Lagos 

                                                                        School of science and Technology

                                                                 MARCH/APRIL 2013 Examination 

COURSE CODE: CIT 311

   COURSE TITTLE: COMPUTER NETWORKS

 TIME ALLOWED: 2hrs 30MIN

    Instructions: ANSWER ANY 5 QUESTIONS each carry 14 marks

1a. List and discuss 3 classifications of networks

b. with the aid of a diagram give a brief description  of the concept of star topology

2a. in transmission. What is the difference between full duplex and half duplex operations?

b. list and discuss the sub layers of the data link layer 

3. State seven typical routing protocols and their associated network operating system 

4a. what is the different between baseband and broadband communication 

b. give any 4 regular applications of integrated services digital network

5a. give the full meaning of the following acronyms within the context of computer networks

i. VPI

ii.VCI

b. state any 5 task which a modem can perform 

6. Specify the status of the modem indicator light in the following settings

i. when not receiving calls

ii. When modem is getting data or command from the computer

iii. When modem is sending data

iv. if the modem is powered up

7a. List and discuss the 2 types of categories of an ATM connection

b. state and enumerate the 3 types of interfaces which an ATM switch

  supports

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