TCP and UDP

TCP and UDP

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  Introduction to TCP andUDP -Ramesh Giri
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  Contents •Introduction •Pros and Cons •TCPheader •UDP header •Conclusion
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  Introduction TCP(transmission control protocol)and UDP(User Datagram protocol)works in transport layer of OSI model and are used for data transfer. 1
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  1 TCP -> It aconnection-oriented protocol, which means a connection is established before transferring data. -> Connection should be maintained until the application programs at each end have finished exchanging messages. -> Used for confidential data transfer 1 2
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  11 3 3-Way Handshaking
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  1 Pros OF TCP •It guarantees three things – -> Your data reaches its destination, -> It reaches there in time. -> It reaches there without duplication. •In TCP, since all the work is done by the operating system, so you just need to sit back and watch the show 1 4
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  1 Cons OF TCP •Ifthere are bugs in your OS, then you will face many problems like problems in surfing and downloading contents from the net. • TCP cannot be used for broadcast and multicast connections. •It is slower in functioning than UDP 1 5
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  11 6
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  UDP •UDP is notconnection-oriented, So no connection needed to transfer data. •Mostly suitable for applications that needs fast and efficient transmission •Used in Video conferencing, Streaming and Voice call. 1 7
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  Pros of UDP •Multiple messages can be sent as packets in chunks. • It does not restrict you to connection based communication model. •Much faster than TCP 1 9
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  Cons of UDP •There are no guarantees with UDP. It is possible that a packet may not be delivered, or delivered twice, or not delivered in time. • Doesn’t ensure that communication has reached receiver as acknowledge is not sent. •Connectionless and unreliable 1 10
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  Contd… •No way ofpredicting the order in which message is received. •Cannot ensure the lost data or packet. 1 11
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  UDP Header 1 912
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  Conclusion Both TCP andUDP are protocols used for sending bits of data — known as packets. They both build on top of the Internet protocol. Either TCHP header or UDP header is sent as header while sending data. 1 9 13
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