ATM --Asynchronous Transfer Mode. The international standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media, such as E3, SONET, and T3.
DHCP --Dynamic Host Configuration Protocol. Provides a mechanism for allocating IP addresses dynamically so that addresses can be reused when hosts no longer need them.
InARP --Inverse ARP (Address Resolution Protocol). Method of building dynamic routes in a network. Allows an access server to discover the network address of a device associated with a virtual circuit.
PPP --Point-to-Point Protocol. Successor to SLIP (Serial Line Internet Protocol) that provides router-to-router and host-to-network connections over synchronous and asynchronous circuits. Whereas SLIP was designed to work with IP, PPP was designed to work with several network layer protocols, such as IP, IPX (Internetwork Packet Exchange), and ARA (AppleTalk Remote Access). PPP also has built-in security mechanisms, such as CHAP (Challenge Handshake Authentication Protocol) and PAP (Password Authentication Protocol). PPP relies on two protocols: LCP (Link Control Protocol) and NCP (Network Control Protocol).
PPPoA --Point-to-Point Protocol over ATM. A network protocol for encapsulating PPP frames in ATM AAL5. It is used mainly with cable modem, DSL, and ADSL services.