IBM SC30-3681-08 manual Inverse Address Resolution Protocol InARP

protocol does not provide error recovery and ¯ow control and does not guarantee the reliability of the physical network.

interoperability. The capability to communicate, execute programs, or transfer data among various functional units in a way that requires the user to have little or no knowledge of the unique characteristics of those units. (T)

intra-area routing. In Internet communications, the routing of data within an area.

Inverse Address Resolution Protocol (InARP). In

the Internet suite of protocols, the protocol used for locating a protocol address through the known hardware address. In a frame-relay context, the data link connection identi®er (DLCI) is synonymous with the known hardware address.

IPPN. The interface that other protocols can use to transport data over IP.

IP address. The 32-bit address de®ned by the Internet Protocol, standard 5, Request for Comments (RFC)

791. It is usually represented in dotted decimal notation.

IP datagram. In the Internet suite of protocols, the fundamental unit of information transmitted through an internet. It contains source and destination addresses, user data, and control information such as the length of the datagram, the header checksum, and ¯ags indicating whether the datagram can be or has been fragmented.

IP router. A device in an IP internet that is responsible for making decisions about the paths over which network traffic will ¯ow. Routing protocols are used to gain information about the network and to determine the best route over which the datagram should be forwarded toward the ®nal destination. The datagrams are routed based on IP destination addresses.

IPXWAN. A Novell protocol that is used to exchange router-to-router information before exchanging standard Internetwork Packet Exchange (IPX) routing information and traffic over wide area networks (WANs).

L

L2TP Access Concentrator (LAC). A device attached to one or more public service telephone network (PSTN) or ISDN lines capable of handling both PPP operation and of the L2TP protocol. The LAC implements the media over which L2TP operates. L2TP passes the traffic to one or more L2TP Network Servers (LNS). L2TP can tunnel any protocol carried by the PPP network.

L2TP Network Server (LNS). An LNS operates on any platform capable that can be a PPP end station. The LNS handles the server side of the L2TP protocol.

Since L2TP relies only on the single media over which L2TP tunnels arrive, the LNS has only a single LAN or WAN interface, yet is still able to terminate calls arriving from any the full range of PPP interfaces supported by a LAC. These include asynchronous ISDN, synchronous ISDN, V.120, and other types of connections.

LAN bridge server (LBS). In the IBM Token-Ring Network Bridge Program, the server that keeps statistical information about frames forwarded between two or more rings (through a bridge). The LBS sends these statistics to the appropriate LAN managers through the LAN reporting mechanism (LRM).

LAN Emulation (LE). An ATM Forum standard that supports legacy LAN applications over ATM networks.

LAN Emulation Client (LEC). A LAN Emulation component that represents users of the Emulated LAN.

LAN Emulation Con®guration Server (LECS). A LAN Emulation Service component that centralizes and disseminates con®guration data.

LAN Emulation Server (LES). A LAN Emulation Service component that resolves LAN Destinations to ATM Addresses.

LAN Network Manager (LNM). An IBM licensed program that enables a user to manage and monitor LAN resources from a central workstation.

LAN segment. (1) Any portion of a LAN (for example, a bus or ring) that can operate independently, but that is connected to other parts of the network by means of bridges. (2) A ring or bus network without bridges.

layer. (1) In network architecture, a group of services that is complete from a conceptual point of view, that is one out of a set of hierarchically arranged groups, and that extends across all systems that conform to the network architecture. (T) (2) In the Open Systems Interconnection reference model, one of seven conceptually complete, hierarchically arranged groups of services, functions, and protocols, that extend across all open systems. (T) (3) In SNA, a grouping of related functions that are logically separate from the functions in other groups. Implementation of the functions in one layer can be changed without affecting functions in other layers.

LE. LAN Emulation. An ATM Forum standard that supports legacy LAN applications over ATM networks.

LEC. LAN Emulation Client. A LAN Emulation component that represents users of the Emulated LAN.

LECS. LAN Emulation Con®guration Server. A LAN Emulation Service component that centralizes and disseminates con®guration data.

Glossary 701