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Assignment No. 01

Semester:Fall 2017
Data Communication– CS601

 

Total Marks: 15

 

Due Date:8/11/2017

 

Instructions:

Please read the following instructions carefully before submitting the assignment:

  • You will submit your assignment before or on due date on VU-LMS.
  • Assignment sent via Email will not be replied and accepted/graded in any case.
  • If the submitted assignment does not open or file is corrupt, it will not be graded.
  • Assignment should be completed by your own efforts it should not be copied from internet, handouts or books.
  • You will submit solution only in the Microsoft Word File.
  • Assignment is covered from lectures 1 to 8.

Assignment Questions

 

Questions:                                                                                                           Marks 15

 

Question. 1Assume 50 students are  performing following different activities on different computers according to their need in a VU LAB. All the computers contains 4GB RAM, Intel Core i5 processor, 2.7 GHz clock speed and 500 GB SATA, connected to one LAN through fiber optic cable providing  internet speed of 5 Gbps. In this VU LAB which of the following applications are more sensitive to delay?(1.25 * 4) = 5(5 Marks)

 

  1. 1.      Sending an e-mail
  2. 2.      Copying a file
  3. 3.      Surfing the Internet
  4. 4.      Login to VULMS

 

Question. 2 Assume there are 100 devices in a network, how many number of cable links are needed for mesh and star topology?Give Formulae and Calculation Both.(3+2= 5 Marks)

 

Question. 3   Match the following to their relevant layer of the OSI model:                       (5 Marks)

 

  1. Detection of error between nodes
  2. Selection of route
  3. Transmission of bit stream across physical medium.
  4. Ensures reliable transmission of data
  5. Defines frames

 

 

Best of Luck

 

 

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the one you send before and this one, these both have opposite answers . if so then which one is correct.

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see Q.1 and Q.23 of this exercise....

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Assignment No. 01
Data Communication– CS601

Question no 1:
Assume 50 students are performing following different activities on different computers according to their need in a VU LAB. All the computers contains 4GB RAM, Intel Core i5 processor, 2.7 GHz clock speed and 500 GB SATA, connected to one LAN through fiber optic cable providing internet speed of 5 Gbps. In this VU LAB which of the following applications are more sensitive to delay?

1. Sending an e-mail
2. Copying a file
3. Surfing the Internet
4. Login to VULMS
ANSWER:
 
1.      Sending an e-mail

As It is not an interactive application , It is not a sensitive to delay.
2.      Copying a file

copying is itself a slow process and we do not expect files to be copied immediately , it is not sensitive to delay.

3.      Surfing the Internet

It is very sensitive to delay because we expect to get access to site we are browsing very quickly and surfing internet requires very high speed internet.


4.      Login to VULMS

As it is also an interactive application , it is also very sensitive to delay.


Question.2 :
Assume there are 100 devices in a network, how many number of cable links are needed for mesh and star topology? Give Formulae and Calculation Both.

Answer:
Number of cable links in mesh topology= n (n-1)/2
=100(100-1)/2
=4950
Number of cable links in star topology will be 100 because in star topology every device needs only 1 node.

Question.3  :
 Match the following to their relevant layer of the OSI model:                       

Detection of error between nodes
Selection of route
Transmission of bit stream across physical medium.
Ensures reliable transmission of data
Defines frames

Answer:

Detection of error between nodes Transport Layer
Selection of route Network Layer
Transmission of bit stream across physical medium. Physical Layer
Ensures reliable transmission of data Transport Layer
Defines frames Data Link Layer

CS601 Assignment#01 Complete Solution 

Attachments:

Answer to question 1

  • Surfing the internet or login to VULMS is most sensitive to delays as it is an interactive application and user demands instant results
  • Copying the file operations are not normally expected to be completed in a instant
  • Sending the Email is least sensitive to delay as once the message is sent, its stays in the inbox for a while before the receiver opens it

Answer to Q no:1

Answer no1: 

1. Sending an e-mail


Not sensitive to delay because it is not an interactive application. 

2. Copying a file

Not sensitive to delay because we do not expect a file to be copied immediately. 

3. Surfing the Internet

It is very sensitive to delay because we expect to get access to site we are browsing very quickly. 

4. Login to VULMS

As it is also an interactive application, it is also very sensitive to delay.

**********

Question. 2 
Mesh
Formula: n(n-1)/2
= 100(100-1)/2 
= 100(99)/2 
= 9900/2 
= 4950

Star
Formula: n 
n = 100

CS601 assignment#01 Solution

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