Unit 1.4 - Wired and Wireless

Unit 1.4 - Wired and Wireless

1. Definitions

   • Router - Manages traffic coming through in the form of packets
   • Switch - Sends data through multiple streams to where it needs to go
   • Bandwidth - Amount of data you can send through a cable
   • Hub - Replaced by the switch, could only prioritise one stream of data
   • Transmission Control Protocol - Sends a message conforming or re-requesting delivery
   • WAP - Allows access to a network wirelessly or through bluetooth
   • NIC - Allows a computer to connect to a wired network
   • LAN - Local Area Network WAN - Wide Area Network
   • HTTP - Hyper Text Transfer Protocol FTP - File Transfer Protocol
   • DNS - Domain Name Server - A list of web addresses translated into Internet Protocol (IP)

2. The Cloud

   • The cloud is a network of servers
   • Some run applications
   • Some will store data

3. Webpages

   • They are made of HTML (Hyper Text Markup Language)
   • There are different parts of a web address
     • HTTP - Hyper Text Transfer Protocol
     • WWW - World Wide Web
     • OCR.ORG.UK - Domain Name
   • Most of the WWW is made of HTTP websites. Some are made from FTP (File Transfer Protocol)

4. Packets

   • Packets contain four bits of information
     • Senders address
     • Receivers address
     • Sequence Number
     • How long it has to live