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# CS601 Assignment No 01 Solution & Discussion Due Date:08-11-2017

 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.      Sending an e-mail 2.      Copying a file 3.      Surfing the Internet 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)   Detection of error between nodes Selection of route Transmission of bit stream across physical medium. Ensures reliable transmission of data Defines frames Best of Luck

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anyone can help me in question no1 cs601

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Assignment No. 01
Semester: Fall 2017
Data Communication– CS601

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.

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

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 Solution

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Assignment No. 01
Semester: Fall 2017
Data Communication– CS601
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.
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

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

where is the solution of Q:1????

CS601 - Data Communication
Assignment 1
Fall 2017

Solution

Question. 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

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   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.

Mesh
Formula: n(n-1)/2 (where n = number of devices)
= 100(100-1)/2
= 100(99)/2
= 9900/2
= 4950

Star
Formula: n = number of devices
n = 100

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

a.     Detection of error between nodes
OSI Layer: Data link

b.      Selection of route
OSI Layer: Network

c.       Transmission of bit stream across physical medium.
OSI Layer: Physical

d.      Ensures reliable transmission of data
OSI Layer: Transport

e.       Defines frames
OSI Layer: Data link

It is true that performance is inversely proportional to delay.
Sending an email is more sensitive to delay than copying a file and surfing the internet.Because  E-mailing may be interrupted due to high latency, but can always assume as soon as the server is performing again, without user interaction.
Copying a file is less sensitive to delay than surfing the web and sending an e-mail.

Surfing the web is not so much affected by delay because due to effect of latency on surfing the net.

Assignment No. 01
Semester: Fall 2017
Data Communication– CS601

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.

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

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

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