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Computer Networking- CCNA part 11 of Segment 1- Transport Layer of OSI Model



Transport Layer 

hello friends , i am Vasu Birla and today we will dicuss about he forth layer that is Transport Layer.
 This layer works as a transaction point between upper three layer application , presentation , sessikon layers and lower three data layers  physical , data link and network layer.

As we all know today’s computers supports multitasking features.  Multitasking means at the same thime multiple applications can be run and send and recieve data . Transport layer provides servieces through which these all applications can send and receive data using lower layers at the same time. 


Transport layer is also responsible for end to end transport.

Transport layer moniters diffrent kind of data which recived from diffrent application. Transport layer combines these data into a single data unit and send it to lower layer. And at lower layers recieving devices split this single unit data and send to compatible applications.
(Jo data transport layer single unit me send karta he reciving devices use split karke jis application ke liye jo data he unhe send karta he. )

Important features of transport layer. 

  •     Segmentation-  PDU (packet data gram unit) it means  at this layer data is in form segments.
  • ·        Multiplexing and Demultiplexing-  as we disucces above ..many to one data and , one to many data. 
  • ·        Process level addressing – Every service is given a port number . When a perticular application send and receive request or data  that application uses a port number.
For example-  Port number 80 is used for Web or http services.  Port 20 and 21 are used for FTP (file transfer protocol) means uploading and downloading services.

Using this port numbers transport layer seprate the applications and send the right data at right address or on right port number.

  • Connection Services- This the another function of Transport layer , this function provides connetion services to applications and protocols. It has two categaroies 

1.     Connection Less 

2.      Connection oriented

 (In dono mese koi bhi jada achha ya bura nahi he i mean dono ke apne own fuctions and fayde he)

 

  • Error connetion – Protocols of transport layer uses many algorithems for reliable and efficient communication amoung devices , at the time of transmission for detetion of loses and errors done by these protocols

Mainly two protocolos are used at this layer:
TCP protocol – used in mails , banking.
UDP protocol- used in Streaming.



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