File name: Udp Pdf
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Application accepts full responsibility for errors Transport Layer (TCP/UDP) Recall the protocol stack. UDP. Transport-layer protocol. IP packets with same destination IP UDP Packets or User Datagram. Checksum covers three sections The User Datagram Protocol (UDP) is called a connectionless, unreliable transport protocol. Computer Networks 4 IP packets with same destination IP and port, but different source IP addresses and/or source port numbers: will still be directed to same socket at destination Application programs bind themselves to port numbers. checks destination port in UDP header on datagram. Same best-effort semantics as IP Messages can be delayed, lost, or duplicated Messages can arrive out of order. Checksum covers three sections: Pseudoheader (which does not physically exist as part of the user datagram) UDP header. Both TCP and UDP have port numbers. UDP Versus TCP (1) z Choice of UDP versus TCP is based on: – Functionality – Performance z Performance – TCP’s window-based flow control scheme leads to bursty Internet Transport Protocols. Organize network functionality into protocols and layers Higher layer protocols use the services provided by the lowerlayer Protocolinstancesof the same type communicate with each other virtually. They are different. checks destination port in UDP header on datagram. Connectionless service. Data coming from Application Layer whose length must be an even number of Bytes When host receives UDP datagram. Max UDP Data length =UDP Header (8)Smallest IP header(20) =, Checksum. directs UDP datagram to socket with that port. directs UDP datagram to socket with that port. It does not add anything to the services of IP except to provide process-to-process UDP Versus TCP (1) z Choice of UDP versus TCP is based on: – Functionality – Performance z Performance – TCP’s window-based flow control scheme leads to bursty bulk transfers (not rate based) – TCP’s “slow start” algorithm can reduce throughput – TCP has extra overhead per segment – UDP can send small, inefficient datagrams UDP Packets or User Datagram. Two Transport Protocols Available Transmission Control Protocol (TCP) connection oriented most applications use TCP. RFC User When host receives UDP datagram. Internet layers. Max UDP Data length =UDP Header (8)Smallest IP header(20) =, Checksum. OSI Layers.