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CS601 - Data Communication Assignment No. 1 Solution And Discussion Fall 2013 Due Date: November 26, 2013

Assignment No. 01

(Non Graded)
Semester: Fall 2013

CS601-Data Communication

 

Total Marks: 20

 

Due Date: 26/11/2013

 

Uploading instructions:

 

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  • No assignment will be accepted through email.

 

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It should be clear that your assignment will not get any credit if:

 

·         The assignment is submitted after due date.

·         The submitted assignment does not open or file is corrupted.

·         Your assignment is copied from internet, handouts or from any other student

      (Strict disciplinary action will be taken in this case).

Assignment

 

 

Question 1:   (10 Marks)

 

Which of the layer(s) of the OSI model perform(s) the following functions?

 

Sr. No.

Functions

OSI Layer(s)

1

Route determination

 

2

Reliable process to process delivery

 

3

Provides user services such as email and file transfer

 

4

Error correction and retransmission

 

5

Establishes, manages and terminates session

 

6

Defines frames

 

7

Transmission of bits across medium

 

8

Format and code conversion services

 

9

Ensures reliable transmission of data

 

10

Communicates directly with user’s application program

 

 
 

 

 

 

Question 2:   (10 Marks)

 

Discuss the consequences if a connection fails in each of the following five network topologies having four devices.

 

  1. Devices arranged in a mesh topology
  2. Devices arranged in a star topology (not including the hub)
  3. Devices arranged in a bus topology
  4. Devices arranged in a ring topology
  5. Devices arranged in a dual ring topology

 

 

NOTE: Every student should provide his/her own work, exact copying of the assignment (or some portion of the assignment) from the internet or other students will lead to copy case and zero marks will be awarded. Do not put any query on MDB about this assignment, if you have any query then email at cs601@vu.edu.pk.

 

 

 

Deadline: Your assignment must be uploaded/submitted on or before 26th November 2013.

 

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Replies to This Discussion

I need a little help with the second question!!!!

consequences if a connection fails

Following four networks and consequences if a connection fails.

 

a. Five devices arranged in a mesh topology

b. Five devices arranged in a star topology (not counting the hub)

c. Five devices arranged in a bus topology

d. Five devices arranged in a ring topology

 

Details:

 

a) Mesh Topology

 

If five devices arranged in a mesh topology so we will have 10 links and 4 I/O ports in each hardware device. If any link goes down from them so it will be easy to find out which one is down and it won’t effect on other links. But a bulk of wires and can create problem in re-installation and re-configuration.

 

b) Star Topology

 

In Star topology each device has a dedicated point-to-point link to a Hub. If any link goes down and connections fail so the other won’t be effected. It is easier to reconfigure and sort out the problem area.

c) Bus Topology

 

In Bus topology, a backbone wire is connected with device and further taps and drop lines link the clients. If any link goes down so signals won’t pass on and get back to origin which will create noise on both sides. And if backbone wire is broken so the whole communication will be disabled. Its reconfiguration and modification is difficult than others.

 

d) Ring Topology

 

If we have devices arranged in a ring topology so we have to follow either dual ring technique or switch to prevent whole network down time. Else due to its unidirectional traffic flow will require all links up because signal travels in one direction and completes the ring through point to point until reach its destination. Every point receive the signal and regenerate it by the repeater incorporated in it. If any point is down so the network will be alarmed for network operator.

iski qasr reah gai the vu  waly pagl kr daen gyn

i agree wd u sis

Thnxxx

BUT assignmt mn 4 devices given hn..

Please Discuss here about this assignment.Thanks

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

For Question 2:

a) Mesh Topology

 

If five devices arranged in a mesh topology so we will have 10 links and 4 I/O ports in each hardware device. If any link goes down from them so it will be easy to find out which one is down and it won’t effect on other links. But a bulk of wires and can create problem in re-installation and re-configuration

b) Star Topology

 

In Star topology each device has a dedicated point-to-point link to a Hub. If any link goes down and connections fail so the other won’t be effected. It is easier to reconfigure and sort out the problem area.

 

c) Bus Topology

 

In Bus topology, a backbone wire is connected with device and further taps and drop lines link the clients. If any link goes down so signals won’t pass on and get back to origin which will create noise on both sides. And if backbone wire is broken so the whole communication will be disabled. Its reconfiguration and modification is difficult than others.

 

d) Ring Topology

 

If we have devices arranged in a ring topology so we have to follow either dual ring technique or switch to prevent whole network down time. Else due to its unidirectional traffic flow will require all links up because signal travels in one direction and completes the ring through point to point until reach its destination. Every point receive the signal and regenerate it by the repeater incorporated in it. If any point is down so the network will be alarmed for network operator.



For Question 1:

TRANSPORT LAYER

ensures that messages are delivered error-free {for above 9}

PRESENTATION LAYER

The presentation layer formats the data to be presented to the application layer. It can be viewed as the translator for the network. This layer may translate data from a format used by the application layer into a common format at the sending station, then translate the common format to a format known to the application layer at the receiving station. 

The presentation layer provides: 

  • Character code translation: for example, ASCII to EBCDIC.
  • Data conversion: bit order, CR-CR/LF, integer-floating point, and so on.
  • Data compression: reduces the number of bits that need to be transmitted on the network.
  • Data encryption: encrypt data for security purposes. For example, password encryption.

          {for above 8}



application layer is the ans  of above 10 caz

APPLICATION LAYER



The application layer serves as the window for users and application processes to access network services. This layer contains a variety of commonly needed functions: 

  • Resource sharing and device redirection
  • Remote file access
  • Remote printer access
  • Inter-process communication
  • Network management
  • Directory services
  • Electronic messaging (such as mail)
  • Network virtual terminals



The mesh topology is distinguished by having redundant links between devices. A true mesh configuration has a link between each device in the network. As you can imagine, this gets unmanageable beyond a very small number of devices. Most mesh topology networks are not true mesh networks. Rather, they are hybrid mesh networks, which contain some redundant links, but not all.


Mesh topology networks become more difficult to install as the number of devices increases because of the sheer quantity of connections that must be made. A true mesh of only six devices would require 15 connections (5+4+3+2+1). A true mesh topology of seven devices would require 21 connections (6+5+4+3+2+1), etc.

In mesh topology, the failure of even a single link does not incapacitate the entire system. Each connection can carry its own data load.
Hope this helps.

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