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PPPoE: Point to Point Protocol over Ethernet. Many DSL modems use PPoE to establish and
maintain a connection with a service provider. PPoE provides a means of logging in to the
ISPs servers so that they can authenticate you as a customer and provide you access to the
Internet. Check with your ISP before blocking this protocol.
IP Multicast: IP Multicast is an extension to the IP protocol. It enables individual packets to be
sent to multiple hosts on the Internet, and is often used for handling e-mail mailing lists and
teleconferencing/videoconferencing.
RARP: Reverse Address Resolution Protocol. This IP protocol provides a way for computers
to determine their own IP addresses when they only know their hardware address (i.e., MAC
addresses). Certain types of computers, such as diskless workstations, must use RARP to
determine their IP address before communicating with other network devices.
AppleTalk®: A networking protocol used in for Apple Macintosh® networks.
NetBEUI: NetBIOS Enhanced User Interface. On many LAN operating systems, the NetBEUI
protocol provides the method by which computers identify themselves to and communicate
with each other.
IPX: Internetwork Packet Exchange. A networking protocol used on Novell Netware ®-based