Networks

1. Advantages
   1. Easily share files and data
   2. Share resources such as printers and internet connections
   3. Communicate with other network users
   4. Store data centrally for ease of access and backup
2. Disadvantages
   1. Computers will be more vulnerable to hackers
   2. Increased risk of data corruption
   3. Computers can be more easily attacked by viruses
   4. Implementation costs are higher because of a server and network cabling

Annotations:

• One or more computers are designated to serve the client computers. These clients will communicate with each other and externally through the server.

1. Server

   Annotations:

   • A computer that includes a faster processor, more RAM and a lot more backing storage space than a client computer.
   1. A file server may look after the organidation of files on the network
   2. A print server may coordinate the printing on the network
2. Terminal

   Annotations:

   • Any computer that gives a user access to any type of network 

Annotations:

• A peer to peer network allow every computer to communicate directly with every other computer in the network

1. Network Interface Card
   1. A conputer is connected to a LAN using a NIC
2. Wireless LAN
   1. Component requirements
      1. Wireless access points
         1. A wireless connection requirement containing a radio reciever, encryption and communications software, that broadcast to and recieve signals from wireless netnetwork interface cards
      2. Wireless NICs
      3. Routers
         1. A harware device that enable several computers to communicate through a wireless acess point at the same time
   2. Booster
      1. A device that amplifies a wireless signal so that it can be detected at greater distances from the wireless access point.
   3. Than a wired LAN: 》more flexible 》relatively slow transmission speed 》prone to illegal access more

1. Short range
2. Radio signals
3. Than WiFi: 》much slower data transfer rate 》much shorter range
4. Requires a tranceiver chip

1. The volume of data that can be transmitted in a given time

1. Refers to data transmission over a telephone line using an analogue modem
2. Uses dial-up to access the Internet
3. Modem
   1. A device used to convert the digital signal emitted by a computer to analogue signals that can be transmitted over a telephone line

1. Data transmission using ADSL and cable
   1. ADSL: Asymmetric Digital Subscriber Line
      1. A means of transmitting digital signals using telephone lines
         1. Many times faster than narrownband