computing

computing

1. networks

   • LAN's
     • covers a small geographical area
     • used in schools or homes
   • WAN's
     • covers a wide geographical are
     • would be used in large areas E.G. the internet

2. network hardware

   • switch's
     • connect devices on a LAN
   • router
     • transmits data between networks
   • network interface card
     • allows the device to connect to a network
   • wires
     • ethernet
       • used to connect device's TO A lan
     • coaxial
       • connects areal devices
     • fiber optic
       • transfers data as light to ovoid interferance

3. servers

   • peer to peer
     • all devices at equal status like home wifi
   • client server
     • all clients are depemdant on a central server like school
   • topoligies
     • bus
       • star
         • mesh
           • ring
             • data flows arround a ring to ovoid collishions
           • all devices are fully connected to each other so if one goes down the rest stay connected
         • all devices are connected to a central switch
       • straight line all devices connected on one central backbone cable

4. security threats

   • a passive attack
     • someone monitors data travelling and intersepts sensitive information
   • active attack
     • someone attacks a network with malware
   • insider attack
     • exploits information about the network from inside
   • brute force attack
     • hacker trys many passwords that are relivant
   • denile of acsess attack
     • holding the account at ransom

5. protocalls

   • a protocall is a set of rules for how devices communicate and transmit data
   • http
     • hyper text tranfer
   • https
     • hyper text transfer secure
   • ftp
     • file transfer protocall
   • pop3
     • post office protocall 3
   • imap
     • internet message accsess protocall
   • smpt
     • simple mail transfer protocall
   • protocall layers
     • data link layer
     • network layer
     • transport layer
     • application layer

6. communication