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Name Server
A computer running a program that converts domain names into appropriate IP addresses and vice versa.

A group of two or more computers that are connected to each other in order to exchange information. A LAN is a small network, while the Internet is the largest network in the world.

Network Address Translation
A firewall technique that allows a LAN to be represented to the Internet as a single IP address. In other words, the external network only sees the IP address of the NAT server, so that they can not locate the individual computers behind it.

Network Intrusion Detection Systems (NIDS)
A type of Intrusion Detection System that works at the network level by monitoring packets on the network and gauging whether a hacker is attempting to sending a large number of connection requests to a machine on the network, indicating an attempt to either break into a system or cause a denial of service attack. Unlike other Intrusion Detection Systems, a NIDS is able to monitor numerous computers at once.


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