1 Types and components of computer systems

Question 1

everything about LAN

Answer 1

Not over a large geographical area (e.g. in one building)

consist of a number of computers and devices,

• connected to hubs or switches.
• hubs or switches connected to a router and modem allows the LAN to connect to the

internet and in doing so it then becomes part of a wide area network

• Advantages of networking using LAN:
• The sharing of resources
• Communication between users
• Network administrator can control and monitor all aspects of the network
• Disadvantages of networking using LAN:
• Easier spread of viruses throughout the whole network - increased security risks
• Slower access to external networks, such as the internet
• If main server breaks down, usually the networks will no longer function.

Question 2

what is a modem

Answer 2

• Used to transmit data of computer thr telephone line
  1. Converts computer’s digital signals 👉 analogue for transmission ( modulates it) thr telephone lines and
  2. from telephone line converts analogue signal 👉 digital for computer to process data (demodulates it)

Question 3

what is a briges

Answer 3

connect LANs together

Question 4

LANs

Answer 4

• collection of computers, share peripherals, infos and communicate over network
• over small geographical area (e.g in a bulding, room)
  😃software/ files can be shared between users
  👉cheaper to buy license for several computer
  😃 users can work together on a shared document
  😃sharing of resources
  😃communication of users

😡 easier to spread virus
😡 slower access to external network (e.g internet)
😡 high set up cost
😡 risk of data corruption