CS 101 Introduction to Computing Assignment # 05

Deadline

Your assignment must be uploaded / submitted before or on July 02, 2010.

Upload Instructions

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Rules for Marking

Please note that your assignment will not be graded if:

· It is submitted after due date

· The file you uploaded does not open

· The file you uploaded is copied from some one else or from internet

· The file you uploaded is in a format other than .doc

Objective:

The assignment has been designed to enable you:

• Understanding of Computer Networks

Assignment: Total Marks =10

Q.1 XYZ is an organization, wants to develop the network. Total numbers of computers are 7. Which topology is best suitable for the network? Justify your answer. 4 Marks

Answer:

bus topology :

• Because easy to implement and extend...
• Easy to install.....
• Cheaper than other topology bcos no server is needed.....
• Cost effective, because only a single cable is used....
• Easy identification of cable fault.....
• It works’’ best’’ with limited number of nodes......
• Bus network topology uses a broadcast channels which means that all attached station can hear every transmission and all station have equal priority in using the network to transmit data.........
• If any node is down, the overall functionality of network is not affected...................................................
• I think star is not used in this case because there are limited computer ,and due to server its cost will be more,

Q.2 If computer A wants to transmit the data to computer F, then

6 Marks

What condition should A satisfy?

What protocol should be used?

And how the data will transmit?

Condition:

• If computer A wants to send data it must have an empty token.
• The network fail if a single node fails in ring network, so nodes should not fail during the process.
• Messages propagate in one direction only, either clock wise OR counter clock. Wise. In this we take as an antic lock wise.

Protocol:

• This is a ring network. So ring protocol will be used for that.
• This protocol passes a special message called a token through the network .a computer that receives the token is given permission to send a packet of information.

• If computer A wants to send data it must have an empty token.
• It attaches data to the token. The token then proceeds around the ring until it comes to computer for which the data is meant.(i.e. F)

Transmit ion of data:

· Computer ‘A’ sends the message to its neighbor ‘H’.

· The computer ‘H’ will examine the message, because this data are not intended for H, so….

· It passes the message to next computer in the ring that is ‘G’.

· Computer ‘G’ also examines the message and sent it to next computer in the ring that is ‘’F’’.

· So in this way Computer ‘’’’F’’’ receives the data.