Internet/ Networks

• Modem- this device allows an individual compute to connect to the Internet via a phone line. There are two main types; dial up and broadband • Router- this device is used to link one network to another network. A router will therefore allow all the computers in a network to have a connection to the Internet

HTML stands for HyperText Mark-up Language. It is important because it defines a standard that allows data (web page) to be displayed correctly on any computer that uses a web browser that conforms to the HTML standard

PDF stands for Portable Document Format. It allows documents to be viewed and printed without the need for the original software that created them.

A disaster recovery policy aims to reduce the risk and then minimise the impact of a natural or man-made disaster on a network or computer system.

Wide Area Network. A network of computers in a large geographical area, eg within a city, county or country. the WAN may incorporate LANs

A peer to peer network that is connected in a ring

In a peer to peer network, computers are simply linked together, they don’t have particular roles and each has equivalent responsibility and status. Any computer on the network con load information from the hard disk of any other computer and a computer on the network can use any printer connected to the network.

A router routes the data packets to all connected PCs A switch sends the data packets to jus target the PC

It is a unique 32 bit reference number that is allocated to devices in an IP computer network

A set of rules an employee will usually sign as part of their contact which states ways in which a computer network/ system is allowed to be used.

Local area network, a network that operates over a small geographical area

The name given to the way in which devices are physically connected in a network. There are thee main ones; ring, bus and star

Each PC must have a NIC (which could be cable or wireless) cabling is required for non-wireless networks a router or a switch is required in some networks a Wireless Access Point is required for wireless networks and acts like a router/switch

The devices are connected in a star with the central device acting as a server. This is a client-server network.

The IP adress

This means that the files are no longer in active use and are moved somewhere where they can still be accessed if needed. An archived file is therefore the original file, not a backup. Archived files are often compressed, therefore they take up less memory.

A public IP address is used on a WAN (or the Internet) and a private is used on a LAN.

The set of rules that two or more devices are set up to use so that they can communicate with each other. Eg, Internet protocol or Transmission Control Protocol.

• access levels • user groups • disaster recovery • AUP • back up • physical security measures • firewall/anti virus • data encryption

• automatic shut down systems • intruder, flood, earthquake and fire alarms • off-site and local backup systems • data replication and failover systems

• Peripherals, like printers, can be shared • All workstations on the network can be backed up centrally • Messages can be sent between users • Users can share files, which helps prevent duplication of data • Software for a network is cheaper than individual licences

All devices are connected to a main spine cable. This is a peer to peer network.

A switch sends the data packets to the correct device whereas a router sends the data packets to all of the devices on the network.

There are two roles in the network: client and server Client: connected to the server Server: control access to shared resources like files and printers