Difference Between TCP and UDP at Transport Layer
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TCP |
UDP |
|---|---|
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TCP is a connection-oriented protocol |
UDP is the connection-less protocol |
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TCP is reliable. |
UDP is not reliable. |
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TCP supports error-checking mechanisms. |
UDP has only the basic error-checking mechanism using checksums. |
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An acknowledgment segment is present. |
No acknowledgment segment. |
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TCP is slower than UDP |
UDP is faster, simpler, and more efficient than TCP. |
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Retransmission of lost packets is possible in TCP, but not in UDP. |
There is no retransmission of lost packets in the User Datagram Protocol (UDP) |
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TCP has a (20-60) bytes variable length header. |
The header length is fixed of 8 bytes. |
Transport Layer in OSI Model
The transport layer, or layer 4 of the OSI model, controls network traffic between hosts and end systems to guarantee full data flows. Data volume, destination, and rate are all controlled by transport-layer protocols including TCP, UDP, DCCP, and SCTP.
The transport layer is positioned between the network and session layers in the OSI paradigm. The data packets must be taken and sent to the appropriate machine by the network layer. After that, the transport layer receives the packets, sorts them, and looks for faults. Subsequently, it directs them to the session layer of the appropriate computer program. Now, the properly structured packets are used by the session layer to hold the data for the application.