NEWWAAAR

NEWWAAAR

1. Types of network

   • LAN (Local Area Network)
   • WAN (Wide Area Network)
   • Peer To Peer

2. Advantages of networks

   • Connect to devices over network (e.g.: Printer)
   • Connect to internet via Router
   • Share files

3. Hardware

   • Ethernet cable
     • Often called The 'Backbone' of the server
   • Router
     • Connects a network to the internet
   • Hub/Switch
     • Allow multiple computers to connect to the router
   • NIC (Network Interface Card)
     • Takes serial data and turns it into a single stream of data (packet) so it can be sent over the network

4. Topology

   • Star
     • central server in the middle will all the devices connected to this server, this means that data has to go thorough the router first
   • Bus
     • Terminator at each end connected by an ethernet cable with computers in the middle, also connected via ethernet.
     • Very cheap and east to set up, but they are easy to mess up (if one computer goes down then the whole network goes down) they are also not very secure
   • They are logical ways of constructing a network
   • Ring
     • (now outdated) Has a token in the server, and a computer has to get a token to be able to communicate with the rest of the server
   • Mesh
     • Lots of devices that are connected to each other that effectively creates a network, it is quick and fast but can be not very secure because effectively every computer can access each other. They are most commonly found in wifi networks. There is no single point of failure so it is very reliable

5. IP (internet protocol) adress

   • Unique iD used over a network to identify the sender and the recipient
   • Internal IP
     • Network admin assigned that the router knows the device as

6. DNS (Domain Name System)

   • It is the alphanumerical name for a certain IP Address (e.g: www.google.com instead of 192.184.12)

7. MAC Adress (Media Access Control)

   • Are completely unique, this means that they can be individually tracked because no other piece of hardware had the same MAC address
   • Hardwired

8. Internet Potocols

   • HTTP (Hyper Text Transfer Protocol)
     • For web pages, all web pages must use this protocol
   • POP3
     • Post Office Protocol 3
       • For sending email
   • SMTP (Simple mail transfer protocol)
     • For receiving mail
   • FTP (File Transfer Protocol)
   • Rules that things must abide by

9. Packets

   • Split into sections
     • Header
       • Contains Where its going, Recipient, Sender
     • Payload
       • Contains data
     • Footer
       • Contains Bit that shows that it is the end of the packet

10. File Types

    • JPEG
      • Uses lossy compression
      • joint Picture Expert Group
    • Gif
      • Graphical interchange format
    • WAV
      • Uncompressed audio
    • MP3
      • Compressed Audio (good for sharing but looses quality

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