Addressing processes to receive messages,process identifier includes both IP address must have identifier and port numbers associated with host device has unique 32-bit process on host. IP address example port numbers: Q:does IP address of host on ·HTTP server::80 which process runs suffice for ·mail server:25 identifying the process? -to send HTTP message to A:no,many processes gaia.cs.umass.edu web server: can be running on ·1 address:128.119.245.12 same host 。port number:&0 more shortly... Application Layer:2-10Addressing processes Application Layer: 2-10 ▪ to receive messages, process must have identifier ▪ host device has unique 32-bit IP address ▪Q: does IP address of host on which process runs suffice for identifying the process? ▪ identifier includes both IP address and port numbers associated with process on host. ▪ example port numbers: • HTTP server: 80 • mail server: 25 ▪ to send HTTP message to gaia.cs.umass.edu web server: • IP address: 128.119.245.12 • port number: 80 ▪ more shortly… ▪ A: no, many processes can be running on same host