computer science 1.3.1 network and topologies

computer science 1.3.1 network and topologies

1. networks

   • local area network LAN
     • Small geographic area. All the hardware for the LAN is owned by the organisation using it.
   • wide area network WAN
     • Large geographic area. Infrastructure is hired from telecommunication companies who own and manage it.
   • Client server
     • A client makes requests to the server for data and connections. A server controls access and security to one shared file store. A server manages access to the internet, shared printers and email services. A server runs a backup of data.”
   • peer to peer
     • All computers are equal. Computers serve their own files to each other. Each computer is responsible for its own security and backup.

2. factors that affect networks

   • the number of devices on the network.
   • the bandwidth of the transmission medium
   • the type of network traffic.
   • the type of network traffic.
   • the type of network traffic.

3. hardware that connects computers

   • WAP
     • A networking hardware device that allows a Wi-Fi device to connect to a wired network.”
     • wireless acess point
   • router/switch
     • In packet-switched networks such as the internet, a router is a device or, in some cases, software on a computer, that determines the best way for a packet to be forwarded to its destination
   • network interface controller
     • A computer hardware component that connects a computer to a computer network.”
   • transmission media
     • The physical media over which data is transmitted, e.g. twisted copper cable, fibre optic etc.

4. topologies

   • star
   • mesh

5. internet networks

   • domain name server
     • hosting
       • Websites stored on dedicated servers. Reasons include: Websites need to be available 24/7. Accessed by thousands of users at a time. Strong protection from hackers. They need an IP address that doesn’t change.”

6. cloud

   • Remote servers that store data that can be accessed over the internet. Advantages: Access anytime, anywhere from any device. Automatic backup. Collaborate on files easily