1.3.3 Networks

Computer in a client-server network. Less and CPU power needed as most of the is done by the server.

Computer in a client-server network. storage and CPU power needed as most of the processing is done on the client, minimising the use of the server. More costly and less but may be needed when access to the server is not always present

Hardware or that monitors and filters incoming and network traffic based on a set of rules used to prevent unauthorised access to a computer system

A method of transmitting data over a wide area network. The message is into a number of smaller packets sent independently potentially using different and reassembled at the destination

A method of transmitting data over a wide area network. Two network nodes establish a communications channel through the network, all data follows this route for the duration of the data transfer

Transmission Control Protocol / Internet Protocol. TCP provides an error transmission between two routers. 4 of protocols. Application, , Internet and Network. Each layer services the adjacent layer.

Connects a network to another network. For example, connects a to the (WAN)

Connects devices on a . Uses the address to route data to the correct connected device.

Wireless Access . Allows a Wi-Fi device to to a network.

Local Area Network. A network over a geographical area. is owned by the network owner.

Interface Card. Hardware that a device to a network. Can be wired and/or wireless. Assigned a MAC address.

Wide Area Network. A collection of computers on the network which are spread out over a geographic area. Infrastructure is hired from 3rd party companies who own and manage it.

A that makes to a server for data and connections

A type of network. A client makes to the server for data and connections. management of the network.

Websites stored on dedicated . Public can the webpages using a web browser.

A type of network where all computers on the network are computers share their own files with each other each computer is for its own security and backup.

A computer that the webpages and files that can be requested by users on the . Uses HTTP/HTTPS to send the files to the user.

How much data can be transmitted at . More bandwidth means network/transmission…because more data is transferred simultaneously/per second

Factor that affects performance of the network. More users means transmission because more data is transferred simultaneously and each user is the bandwidth. More collisions also affects the performance

Factor that affects the performance of a network. A higher error rate means performance as data packets must be re-sent. This down the overall transmission.

Factor that affects the performance of a network. It is the measure of between sending and receiving the data. Higher the latency the the performance.

The physical media over which data is transmitted. Choice affects the performance of a network. Examples include: , Fibre Optic, Wi-Fi and Bluetooth. Different media have different levels of , transmission speeds, error rate and latency.

Each device is connected to every other device, either directly ( Mesh) or partially ( Mesh). More than one route to the destination so very robust. No need to buy switch. Large number of connections is and less secure

Remote servers that store data that can be accessed over the . High capacity of storage and it can be cheaper than buying a server/secondary storage. However, need internet access, may be slower to access, may be secure and may need to subscription.

A network of networks. Uses routers to transmit of data.

A network where each device is connected to a central . Easy to new devices and transmission is centralised so fewer data collisions. However, single point of failure.

Domain Name System. URL is sent to the Domain Name . URL is into the corresponding IP address. IP address sent back to the user's . An error is returned if the IP address cannot be found.