Difference between revisions of "The Internet"

From TRCCompSci - AQA Computer Science
Jump to: navigation, search
(URL)
(URL)
Line 21: Line 21:
  
 
It specifies:
 
It specifies:
How to access the server, ie which protocol to use
+
How to access the server, ie which protocol to use
 
Which server to access, ie the address if server
 
Which server to access, ie the address if server
 
What is to be accessed on the server, ie the path on the addressed server.
 
What is to be accessed on the server, ie the path on the addressed server.

Revision as of 14:53, 27 February 2017

What is the Internet

How is the Internet connected

Router

Brennan's got this one back off ANARCHY

Gateway

A Gateway is basically Donald Trump. It controls the wall between two different systems, for example on your home router to connect from your devices to internet. However, unlike the Donald, Gateways can translate. They translate the current protocols for the new system to understand. This allows two different systems with different protocols to be connected. Without this, data would be kept outside the border and could not communicate across it - welcome to Trump's America.

How is data transmitted

Packet Switching

Circuit Switching

The End to End Principle

The devices that are communicating should be the endpoints of the communication with no external input. The Internet serves as a medium to carry traffic between them but makes no changes the data involved. Therefore the transmitting devices control every aspect of the transmission, allowing security (through encryption) and the detection of errors, which maintains the integrity of transmitted data.

Using this principle allows the Internet to easily grow because there is no direct control over the number of endpoints.

URL

The Uniform Resource Locator is the standard address used to find a page, Web server or other device on the Web or Internet.

It specifies: How to access the server, ie which protocol to use Which server to access, ie the address if server What is to be accessed on the server, ie the path on the addressed server.

This was invented so that users could use a memorable name to refer to a network and a host on that network. Often the term 'Domain Name' is used instead of the correct term 'Full Qualified Domain Name' (FQDN). The domain name identifies one or more IP addresses. For example, the domain name "Microsoft.com" represents about a dozen IP addresses.

The DNS system is a hierarchy. A Domain Name Server accepts a Domain Name and returns the IP address associated with this Domain Name.

Domain Name

IP Address

Class 1

Class 2

Class 3

Domain Name Server

Internet Registrar

Internet Registries

Related Topics

Subnet Masks

Private - Public IP Addresses

IP6 vs IP4

DHCP

Network Address Translation

Port Forwarding