Networking & IT FAQs
What is a Server centric network?
Also known as a client-server network is more commonly found in medium-sized and large businesses. Computers are connected directly through intermediary machines know as servers. Servers handle all security, information and access to peripherals.
What is a Firewall?
A system designed to prevent unauthorized access to a network, particularly from unauthorized Internet users (or hackers). All information entering or leaving a network is scrutinized, and rejected if it fails to meet the security policy on the firewall.
What is an Intranet?
An internal network of computers (such as an office environment) which allows transmission of data to colleagues. The intranet is controlled by a network administrator who decides on access privileges and controls the network software.
What is a LAN?
Local Area Network. A network of computers in a relatively small area such as an office or school building. Each computer (or node) has its own operating system, but can access files or use devices such as printers or modems, across the network. Users can also chat via their PCs and use email across the network.
What is a Node?
This is another term for a network terminal, or a point where the computer is connected to the network.
What is a Peer-to-peer network?
A peer-to-peer network links computers together, but has no central server. The method allows computers to exchange data and access peripherals with every other computer on the network. Peer-to-peer networks only work with a small number of computers in a small office.
What is a Router?
A router is a bridge between two LANs. A router allows information to be exchanged between two LANs. The Internet uses routing extensively to move information from one LAN to another.
What is a WAN?
Wide Area Network. A computer network that spans a wide geographical area. For example a company might have a number of LANs around the country. Connecting these LANs together would create a WAN. The Internet is one of the world’s biggest WANs.
What is a Packet?
This is a unit of data, which is typically a part of a file, prepared for transmission across a network. In a packet-switching network, such as the Internet, a router examines the packets of data and sends them to their appropriate destination.
What is TCP/IP?
Transmission Control Protocol/Internet Protocol. This is the standard governing communication between all computers on the Internet. TCP/IP works by sending packets of information across multiple networks.
What is a Web server?
This term refers to a computer that serves Web pages. When your browser sends out a request for a page (such as http://www.blablabla.com), the server that holds the pages for this Web site will pick up that request and sends the correct page to your browser.
What is a Proxy server?
A server that sits between your computer and the Web server, which monitors all requests that pass through it. The proxy server intercepts all requests and checks that it doesn’t already have the requested page on its local hard drive. If it does then the proxy server returns the requested Web page from its local hard drive. If the proxy server doesn’t have the requested page then it forwards the request on to the Web server holding the requested page. A proxy server can be used to speed up Internet Access for a large number of users or can be used to filter out certain unsuitable Web pages.
What is DNS?
Domain Name System. Networks operate on a series of IP address. Each machine has one or more IP addresses and one node and one domain. For other people on other domains (or over a WAN or LAN) to resolve these IP addresses to host names a domain name System needs to be used. This links the IP address with the host name. For example the Web site called www.blablabla.com could be linked to the IP address 197.283.37.X x being the final octet and so on.