Q:1 Match the protocols given in Column B with its associated layers given in Column A and write the correct protocol against each layer of Column A in Column C. [Marks 5]

Answer

Column A                                 Column B                                  Column C

LAYERS PROTOCOLS Correct Choice
Application layer TCP FTP
Transport layer Line code TCP
Network layer ARP ARP  & IP
Data link layer FTP
Physical layer IP Line Code


Q. 2  In 3rd column specify / write the appropriate choice from these three choices (header, trailer and N/A). For example, if a layer does not deal with header or trailer, write N/A in front of that particular layer and so on.

In 4th column, specify the appropriate choice from these five choices (data, segment, packet, frame, bits) to its respective layer.

Give short description of the functionality of each layer of OSI model within the provided area in column 5.

[Marks 20]

 

Note: The answer of this question is only acceptable if it is written in the following template.

 


Answer

 

1

2

3

4

5

Sr. No. Layer Name

Header/Trailer/ N/A

Data Unit

Functionality

1

Application

Header

Data

The Application Layer provides different services to the application. Examples of the services provided by this layer are File Transfer, electronic messaging, Virtual terminal access & Network Management.

 

2

Presentation

Header

Raw Data

 

This layer is responsible for protocol conversion, Data Encryption and decryption. This layer makes the communication between two hosts possible

3

Session

Header

 

This layer is responsible for process to process communication between the hosts in the network. This layer is responsible for establishing and ending the session across the network.

4

Transport

Header

Segment

 

This layer is responsible for end to end devilries of messages between the network hosts. it first divides the data into chunks/packets before transmission and then the receiving computer re-assembles these packets. It also ensures error free data delivery without loss or duplication.

5

Network

Header

Packets

 

This layer is responsible for translating the logical network address and name into their physical address (MAC Address). This layer also responsible for addressing, determine the routes for sending and managing network problems such as packet switching, congestion & routines.

6

Data Link

Header/Tailor

Frames

 

This layer is responsible for controlling the error between adjacent nodes and transfers the frame to other computer using physical layer. This layer is sued by hubs, switches for their operation.

7

Physical

N/A

Bits

 

This layer is responsible for transmitting the row bit stream over the physical cable. This layer define the physical hardware such as cables, cards etc.

 

   
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