A-level Computing 2009/AQA/Computer Components, The Stored Program Concept and the Internet/Structure of the Internet

Understand the structure of the Internet, the role of packet switching
 * Internet
 * World Wide Web (WWW) and routers.
 * Intranet

Understand the difference between the Internet, the Web and an intranet.


 * /Internet, Intranet and World Wide Web/
 * /Packet switching/

Uniform Resource Locator (URL)
 * Describe the term URL in the context of Internet working.

Uniform Resource Identifier (URI)
 * Describe the role of URIs in the context of Internet working.

Domain Names and IP Addresses
 * Explain the terms domain name and IP address.
 * Describe how domain names are organised.
 * Know that an IP address is split into a network identifier part and a host identifier part.


 * /IP addresses/

Internet registries and Internet registrars
 * Explain why such services are provided.

Internet Service Providers (ISP)
 * Understand the role of an ISP.

Domain Name Server (DNS)
 * Understand the purpose of Domain Name Server.

The Client–Server Model
 * Be familiar with the client–server model.

Common Standard Protocols: Understand the role of a web browser in retrieving web pages and web page resources and rendering these accordingly.
 * TCP/IP - Describe the role of the four layers of the TCP/IP protocol stack, including sockets.
 * FTP - FTP client software and an FTP server to transfer files using anonymous and non-anonymous access.
 * HTTP - Web server to retrieve web pages in text form
 * HTTPS
 * TELNET - Telnet server for remote management of a server
 * POP3, SMTP - E-mail server to read and send e-mail
 * Well-known ports
 * Client ports


 * /Domain names/
 * /URIs/
 * /Client server model/
 * /Protocols/
 * /TCP/IP protocol stack/