The Internet

A network of computer networks and computers that using unique IP adresses and TCP/IP.

Messages are split into packets, which are routed independently by packet switching.

Routers are used because it is not practical to connect every host directly to every other host.

The intranet is private computer network that uses internet protocols.

The world wide web is a system of interlinked hypertext documents accessed via the internet.

In the client server model, a client process requests a service from a server process.

A protocol provides agreed signals, codes and rules for data exchange between systems.

The TCP/IP Protocal stack consists of four layers: application, transport, network and link.

Some application protocols are HTTP, FTP, Telnet, POP3, SMTP and HTTPS.

DNS Servers translate domain names into IP adresses.

A URI specifies how to access a resource on the internet.

A URL is a URI that identfies a resource by its network location.

A Internet registry stores registered domain names.