Glossary 167Nortel VPN Router Configuration — Basic FeaturesfirewallA collection of hardware and software components that controlscommunication between two networks, such as a private network and theInternet. All information passed between the two networks must pass throughthe firewall. The firewall allows only authorized traffic to pass between thenetworks.VPN RouterA communications device or program that passes data between networkshaving similar functions but dissimilar implementations.interfaceThe connection between a router and one of its attached networks. Aninterface to a network has a single IP address and mask associated with it.InternetThe single, interconnected, worldwide system of commercial, government,educational, and other computer networks that share a set of protocols.Internet Protocol (IP)The transport layer protocol used by the Internet Protocol family fortransporting information among computers.Internet Security Association and Key Management Protocol (ISAKMP)Defines how encryption keys for sessions are initiated and updated.intranetA computer network, especially one based on Internet technology, that anorganization uses for its own internal, and usually private, purposes and that isclosed to outsiders.
