Outubro 2008
Prof. Ismael H. F. Santos -  ismael@tecgraf.puc-rio.br                                                          2
Sockets
nA socket is defined as an endpoint for communication
nConcatenation of IP address and port
nThe socket 161.25.19.8:1625 refers to port 1625 on host 161.25.19.8
nCommunication consists between a pair of sockets
nAll Ports < 1024 are Considered “well-known”
n - TELNET uses port 23
n - FTP uses port 21
n - HTTP server uses port 80