Transport Layer Notes | EduRev

: Transport Layer Notes | EduRev

 Page 1


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Transport Layer
16-May-2011 1
www.eazynotes.com
Page 2


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Transport Layer
16-May-2011 1
www.eazynotes.com
Introduction
? The transport layer is the fourth layer from the 
bottom in the OSI reference model.
? It is responsible for message delivery from process 
running in source computer to the process running in 
the destination computer.
? Transport layer does not perform any function in the 
intermediate nodes.
? It is active only in the end systems.
16-May-2011 2
www.eazynotes.com
Page 3


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Transport Layer
16-May-2011 1
www.eazynotes.com
Introduction
? The transport layer is the fourth layer from the 
bottom in the OSI reference model.
? It is responsible for message delivery from process 
running in source computer to the process running in 
the destination computer.
? Transport layer does not perform any function in the 
intermediate nodes.
? It is active only in the end systems.
16-May-2011 2
www.eazynotes.com
Introduction
? Data Link Layer is responsible for delivery of frames 
between two neighboring nodes over a link.
? This is called node-to-node delivery.
? Network Layer is responsible for delivery of datagrams
between two hosts.
? This is called host-to-host delivery.
? Transport Layer is responsible for delivery of entire 
message from one process running on source to another 
process running on destination.
? This is called process-to process delivery.
16-May-2011
www.eazynotes.com
3
Page 4


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Transport Layer
16-May-2011 1
www.eazynotes.com
Introduction
? The transport layer is the fourth layer from the 
bottom in the OSI reference model.
? It is responsible for message delivery from process 
running in source computer to the process running in 
the destination computer.
? Transport layer does not perform any function in the 
intermediate nodes.
? It is active only in the end systems.
16-May-2011 2
www.eazynotes.com
Introduction
? Data Link Layer is responsible for delivery of frames 
between two neighboring nodes over a link.
? This is called node-to-node delivery.
? Network Layer is responsible for delivery of datagrams
between two hosts.
? This is called host-to-host delivery.
? Transport Layer is responsible for delivery of entire 
message from one process running on source to another 
process running on destination.
? This is called process-to process delivery.
16-May-2011
www.eazynotes.com
3
Transport Layer Design Issues
? The transport layer delivers the message from one process to 
another process running on two different hosts.
? Thus, it has to perform number of functions to ensure the accurate 
delivery of message.
? The various functions of transport layer are:
? Establishing, Maintaining & Releasing Connection
? Addressing
? Data Transfer
? Flow Control
? Error Control
? Congestion Control
16-May-2011
www.eazynotes.com
4
Page 5


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Transport Layer
16-May-2011 1
www.eazynotes.com
Introduction
? The transport layer is the fourth layer from the 
bottom in the OSI reference model.
? It is responsible for message delivery from process 
running in source computer to the process running in 
the destination computer.
? Transport layer does not perform any function in the 
intermediate nodes.
? It is active only in the end systems.
16-May-2011 2
www.eazynotes.com
Introduction
? Data Link Layer is responsible for delivery of frames 
between two neighboring nodes over a link.
? This is called node-to-node delivery.
? Network Layer is responsible for delivery of datagrams
between two hosts.
? This is called host-to-host delivery.
? Transport Layer is responsible for delivery of entire 
message from one process running on source to another 
process running on destination.
? This is called process-to process delivery.
16-May-2011
www.eazynotes.com
3
Transport Layer Design Issues
? The transport layer delivers the message from one process to 
another process running on two different hosts.
? Thus, it has to perform number of functions to ensure the accurate 
delivery of message.
? The various functions of transport layer are:
? Establishing, Maintaining & Releasing Connection
? Addressing
? Data Transfer
? Flow Control
? Error Control
? Congestion Control
16-May-2011
www.eazynotes.com
4
Transport Layer Design Issues
? Establishing, Maintaining & Releasing 
Connection:
? The transport layer establishes, maintains & releases 
end-to-end transport connection on the request of 
upper layers.
? Establishing a connection involves allocation of buffers 
for storing user data, synchronizing the sequence 
numbers of packets etc.
? A connection is released at the request of upper layer.
16-May-2011
www.eazynotes.com
5
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