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# Assignment No. 01 CS601 Data Communication Semester: Spring 2015 Due Date: May 25, 2015.

Assignment No. 1

Semester: Spring 2015

Data Communication - CS601

Total Marks: 12

Due Date: 25/05/2015

Objective:

To have the understanding of signals and their encoding schemes.

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Assignment

Consider a computer network of a social networking web site in which 7 routers are connected with each other using a dedicated wired point to point link. Each link is of 5 meters and cost of wire is 100 PKR per meter.

In view of the above scenario answer the following questions and provide yours to-the-point answers in respective tables.

1. What will be the total number of links before and after adding this new router?

1. What will be the total cost of wire before adding this new router and after adding this router?

Total cost of wire before adding new router

Total cost of wire after adding new router

Note: Give you solution with all relevant calculations in given tables.

Wish You All The Best

J

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### Replies to This Discussion

thanx....

Its correct
Bt i thnk its betr k ap calculatn mn formula b likh len

Thanks @aasma jabeen

I know calculation have to be done.

check its right or wrong ??

2nd Question is wrong correct is like this

Total cost of wire before adding new router

21*5*100                 10500

Total cost of wire after adding new router

28*5*100                 14000

2nd calculation is wrong in screenshot

Before:
Here 7 routers are given which are connected with a mesh topology, you have to find how many links they are connected through?
After:
and if you add one more router in the current mesh, how many links now you have to add?
use this formula:
where n = number of nodes
let us solve one as an example:
suppose we have 5 routers in a mesh and we have to find the number of links:

Aslam0alaikum

It is very easy question see this

No of routers = n = 7

According to formula

putting the value of n

Now

Number of routers = n = 8

According to formula,

Putting the value of n:

Now As we know that cost of wire is 100PRK per meter

So that ,

cost of link(5m wire)  = 5*100

= 500

cost of 21 links = 21*500

cost of 21 links = 10500PKR

and also

cost of 28 links = 28*500

cost of 28 links = 14000PKR

Full and final and 100% correct method and ANSWER

ہن وی سمجھ نئیں آئی تے تواڈا اللہ ای حافظ اے

As it is given in the assignment that there is a computer network of a social networking web site in which 7 routers are connected with each other using a dedicated wired point to point link. Now from the statement ” dedicated wired point to point link” it is clear that the mesh topology is being used in this network.

Formula to find no of links in a mesh network
n(n -1) /2
where n is representing total no of nodes.

1

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