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Port: A number used to identify a specific process or application (such as HTTP or SMTP) to which an Internet or other network message is to be forwarded. If you are operating behind a firewall, you may need to open specific ports to allow users to access these applications.
PPPoE
PPTP
Private IP Address: An IP address given to a LAN device that is unknown to the Internet. These are unregistered IP addresses that have been set aside for use in a LAN environment where constant connection to the Internet is not required. See also: NAT.
Protocol: An objective set of rules for how computers communicate with each other across networks. A protocol describes the form a message must take as well as how that message is exchanged. Hypertext Transfer Protocol (HTTP), for example, governs the way information is exchanged on the World Wide Web.
Public IP Address: A unique, “legal” IP address allocated by an ISP that is used when accessing the Internet. A public IP address can be reached by another device over the Internet. See also: NAT.
RIP Defect (Routing Information Protocol Defect): A type of attack where a hacker sends bogus routing information to a target host causing all information intended for the target host to be routed to the intruder host instead.
Router: An intelligent network device that forwards packets between different networks based on network layer address information such as IP addresses.
Static IP Address: A dedicated, unique IP address that has been assigned to a given computer or server for an extended period of time. Static IP addresses are useful if you are operating a computer that other Internet users need to access, such as a web server.
SOHO (Small Office/Home Office): A small or at-home business.
Subnet Mask: A technique used by the IP protocol to filter messages into a particular network segment or subnet. Subnet masks are expressed as four decimal numbers between 0 and 255 separated by periods. (Example: 255.255.255.1) It is used to create private IP addresses for use within a particular network. Also known as a network mask.
TCP/IP (Transmission Control Protocol/Internet Protocol): The basic communication protocol for the Internet. TCP breaks data down into packets, “reassembles” the data at its destination and verifies delivery. IP determines how to address and forward data and sets packet size limitations.
UDP (User Datagram Protocol): A communication protocol used in place of TCP when reliable delivery is not required. For example, UDP is used for realtime video traffic where lost packets are ignored because there is no time to retransmit.
VPN (Virtual Private Network): A private network of computers that use the public
