04/01/10 Networks - hosts - protocols Internet - global network of networks, using TCP/IP protocols - IP address (IPv4, IPv6) - static assignment - dynamic assignment - loopback address 127.0.0.1 - TCP for reliable communication/ UDP where speed matters more - IP Hostnames - domain names - fully qualified domain name - canonical name, aliases - Domain Name System (DNS) - name resolution/ (forward) DNS lookup - address resolution/ reverse DNS lookup - cache Client-server - port - < 1024 are privileged