Networks

Networks

1. Advantages of Networks

   • You can share files so they are available anywhere
   • You can share resources such as printers and Internet
   • You can share logins so the same username and password can be used on any device.

2. Disadvantages of Networks

   • Expensive- extra hardware and wiring
   • More room for error- if something is wrong it can affect every computer
   • Difficult- it requires techniqual expertise
   • Malware- virus and other malicious material can spread

3. WAN- Wide Area Networks

4. LAN- Local Area Networks

5. Network Toplogies

   • RING
     • Computers are connected in a ring shape. Has no central cable.
     • If a message is sent, it sends to the computer in front of it
     • Advantages and Disadvantages
       • Adv: Cheap to install
       • Adv: No collisions
       • Dis: High chance of catastrophic failure
       • Dis: Difficult to add new computers
   • STAR
     • Advantages and Disadvantages
       • Adv: Easy to add new computers
       • Adv: Fast
       • Adv: Low chance of Catastrophic failure
       • Dis: Expensive
       • Dis: If the switch fails, the whole network goes down
     • All computers are connected by a single switch which directs the traffic to the appropriate user
   • BUS
     • Advantages and Disadvantages
       • Adv: Cheap to install
       • Dis: high chance of catastrophic failure
       • Dis: High chance of collisions
       • Dis: More computers, more collisions
     • Consists OF One Cable that runs through the network
   • MESH
     • Mesh topology is arranged so each computer has more than one wire connected to it so if a cable breaks, the message can find another route

6. IP Adresses

   • An IP address is a unique identifier given to something.
   • An IP address is a unique value assigned to every computer on a network used to identify it
   • Messages on a network have an IP address attached, which is how a computer knows whether or not to keep the message
   • The IP address is a 32-bit binary value
   • Google thinks every computer in a room has the same IP address
   • Each computer in the school has an internal IP address which the internet cannot see and an external one which is the same on every computer in the school

7. THE INTERNET

   • The internet is arranged with devices in a mesh topology

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