networks

• imap

  internet message access protocol- used by mail clients to manage remote mailboxes and retrieve mail from a server
• ip

  internet protocol - routes packets across a wan
• tcp

  transmission control protocol- provides an error free transmission between 2 routers
• ftp

  file transfer protocol- used for sending files between computers usually on a wan
• pop3

  post office protocol v3 - retrieves emails from a server and transfers it to your device
• wi-fi - protocols

  protocols provide the basics of wireless communication
• hypertext transfer protocol


  client-server method of requesting and delivering webpages
• lan

  small geographical area located on a single site, wired with UTP or fibre optic cable
• wan


  covers a large geographical area, connects lans together, connected with satellite links or telephone lines
• network prevention methods

  penetration testing, firewalls, antimalware software
• physical security

  security guards, cctv cameras, door locks
• penetration testing


  attempting to gain access of resources without knowledge of usernames or passwords
• firewall


  prevents unwanted internet traffic getting through
• transport layer

  sets up communication between 2 hosts, they then agree on settings
• application layer

  network apps operate here- web browsers
• link layer

  actual network hardware is located here
• internet layer

  addresses and packages data for transmission and routes packets across the network
• layering

  divides complex tasks- each layer has a defined responsibility, manageable sub-problems
• bandwidth


  maximum amount of data that can be transferred per second
• latency


  length of time taken between a transmission being sent and received
• speed

  transfer rate of data from source to destination
• ethernet

  family of related protocols - basics of communication over a lan
• utp

  wired copper cables, maximum bandwidth, security and reliablilty, twisted to refuce interference