Transport Protocols Relates to Lab 5. An overview of the transport protocols of the TCP/IP protocol suite. Also, a short discussion of UDP.

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Presentation transcript:

Transport Protocols Relates to Lab 5. An overview of the transport protocols of the TCP/IP protocol suite. Also, a short discussion of UDP.

Orientation We move one layer up and look at the transport layer.

Orientation Transport layer protocols are end-to-end protocols They are only implemented at the hosts

Transport Protocols in the Internet The Internet supports 2 transport protocols UDP - User Datagram Protocol datagram oriented unreliable, connectionless simple unicast and multicast useful only for few applications, e.g., multimedia applications used a lot for services network management (SNMP), routing (RIP), naming (DNS), etc. TCP - Transmission Control Protocol stream oriented buffered transfer connection-oriented, full duplex reliable complex only unicast used for most Internet applications: web (http), email (smtp), file transfer (ftp), terminal (telnet), etc.

Port Numbers UDP (and TCP) use port numbers to identify applications A globally unique address at the transport layer (for both UDP and TCP) is a tuple <IP address, port number> There are 65,535 UDP ports per host.

UDP - User Datagram Protocol UDP supports unreliable transmissions of datagrams UDP merely extends the host-to-to-host delivery service of IP datagram to an application-to-application service The only thing that UDP adds is multiplexing and demultiplexing

UDP Format Port numbers identify sending and receiving applications (processes). Maximum port number is 216-1= 65,535 Message Length is at least 8 bytes (i.e., Data field can be empty) and at most 65,535

UDP Checksum UDP checksum computation is optional for IPv4. If a checksum is not used it should be set to the value zero. The UDP checksum is calculated using a UDP-pseudo header, and UDP packet consisting of UDP header and the UDP data. The UDP pseudo header contains the source IP-address, the destination IP-address, the protocol identifier (UDP in this case), and UDP datagram length taken from UDP header. IP Source address IP Destination address Protocol Type: UDP in this case – 17 (0x11) UDP length – header and data