RAD Data comm E1/T1, Modular Access Device with Integrated Router Appendix D Glossary

Appendix D Glossary FCD-IPMInstallation and Operation Manual

I/O - Data Channel Interfaces that can be operated as n x 64k or n x 56k data port (DCE only).

IP Address - The IP Address is a 32-bit host address. It is usually represented in dotted decimal notation, e.g. 128.121.4.5. The address can be split into a network number (or network address) and a host number unique to each host on the network and sometimes also a subnet address.

IP Address is defined in RFC 791.

IP Mask - The IP mask is a unique 4 byte (32 bit) value that allow the recipient of IP packets to distinguish between different host IDs.

IP/IPX Routing - IP/IPX Routing is the process, performed by a router, of selecting the correct interface and next hop for a packet being forwarded. Routing is done in order to send a packet to a specific destination.

IPX (Internetwork Packet Exchange) - IPX is a network layer protocol used in Novell NetWare file server operating system.

A router with IPX routing can interconnect LANs so that Netware clients and servers can communicate.

Leased Lines - A leased line is a private telephone circuit permanently connecting two points, normally provided on a lease by a local PTT.

MAC (Media Access Control) - MAC is the lower sublayer of the data link layer. MAC is the interface between a node's Logical Link Control and the network's physical layer. The MAC differs for various physical media.

MAC Address - The MAC Address is the hardware address of a device connected to a shared network medium.

Mask - A mask is a filtering aid that is used to define classes of addresses. By defining classes, any packet can be judged as to whether it should pass the filter or not.

MTU (Maximum Transmit Unit) - The Maximum Transmission Unit is the largest frame length which may be sent on a physical medium.

MultiCast - MultiCast is an Ethernet addressing scheme used to send packets to devices of a certain type or for broadcasting to all nodes.

NAT – Network Address Translation converts source/destination IP/UDP ports according to management configurations. Address translation allows hosts in a private network and vice versa. NAT is implemented by modifying end node addresses en-route and maintaining a state for these updates so that datagrams pertaining to a session are routed to the right end-node in either realm.

This solution only works when the applications do not use the IP addresses as part of the protocol itself. Even if the NAT includes a mechanism for changing the upper layer protocols IP, encrypted frames will fail in the NAT.

NCP (NetWare Core Protocol) - NCP is a Novell trademark for the protocol used to access Novell NetWare file and print service functions. NCP uses an underlying IPX or IP transport protocol.

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