SECTION 2

The internet and the world wide web

https://en.wikibooks.org/wiki/A-level_Computing_2009/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Internet/Structure_of_the_Internet/Internet,_Intranet_and_World_Wide_Web

https://en.wikibooks.org/wiki/A-level_Computing/AQA/Paper_2/Fundamentals_of_communication_and_networking/The_Internet_and_how_it_works

Client-server model

https://en.wikibooks.org/wiki/A-level_Computing/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Internet/Structure_of_the_Internet/Client_server_model

PHP

https://www.w3schools.com/php/

Javascript

https://www.w3schools.com/js/

IP ADDRESSING

IPV4 - 2 to the power 32 = (approx 4 billion)

0000.0000.0000.0000

NETID.HOSTID

Original schema

CLASS A - 0 - NUMBER BITS FOR NETID = 7 - NUMBER BITS FOR HOSTID = 24

CLASS B - 10 - NUMBER BITS FOR NETID = 14 - NUMBER BITS FOR HOSTID = 16

CLASS C - 110- NUMBER BITS FOR NETID = 21 - NUMBER BITS FOR HOSTID = 8

CLASS / NETID / HOSTID

https://en.wikibooks.org/wiki/A-level_Computing/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Internet/Structure_of_the_Internet/IP_addresses