1 Pertemuan 23 Overview of Transport Layer Ports

Discussion Topics TCP operation Synchronization process or 3-way handshake Denial-of-service attacks Windowing and window size Sequencing numbers Positive ACK UDP operation 2

Telnet Port Numbers

Reserved TCP and UDP Port Numbers

Ports for Clients Whenever a client connects to a service on a server, a source and destination port must be specified. TCP and UDP segments contain fields for source and destination ports.

Port Numbering and Well- Known Port Numbers Port numbers are divided into three different categories: –well-known ports –registered ports –dynamic or private ports

Port Numbers and Socket

Comparison of MAC addresses, IP addresses, and port numbers A good analogy can be made with a normal letter. The name on the envelope would be equivalent to a port number, the street address is the MAC, and the city and state is the IP address.

Summary