Port Numbers and UDP (cont.) THE USER DATAGRAM PROTOCOL (UDP) IS LIKE IP, EXCEPT EACH PACKET'S ADDRESS INCLUDES A "PORT NUMBER". A PORT NUMBERS IS LIKE A TELEPHONE EXTENSION NUMBERS AT A LARGE COMPANY. UDP PACKETS ARE SENT TO A SPECIFIC PORT NUMBER AT A SPECIFIC MACHINE. A PROGRAM CAN REQUEST A PORT NUMBER FROM THE SYSTEM SOFTWARE. AN IMPORTANT PROGRAM CAN REQUEST A SPECIFIC, "WELL-KNOWN" PORT NUMBER.

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This page is part of a section of lecture slides related to " The User Datagram Protocol & Ports " within the topic "The Internet Protocol Suite". Other slides within this section and other sections of slides for the topic "The Internet Protocol Suite" can be accessed using the links below. The Internet Protocol Suite TCP/IP = The Internet Protocol Suite The User Datagram Protocol & Ports Port Numbers and UDP Port Numbers and UDP (cont.) Port Numbers and the Client/Server Model Implementing UDP The Transmission Control Protocol Reliability Best-effort Delivery Router Congestion TCP TCP Implementation TCP Efficiency TCP as Internet Transport Protocol The Domain Name Service Domain Names Domain Name Servers Reliability and Retransmission A Reliable Delivery Problem Cautious Generals Solving the General's Problem Connections (Virtual Circuits)