User Manual

P380 Users guide
40
E
Ethernet A common, 10Mbps local area network technology invented by Xerox
Corporation at the Palo Alto Research Center. Ethernet is a best-effort delivery system
that uses CSMA/CD technology. Ethernet can be run over thinwire coaxial cable
(10BASE2), thickwire coaxial cable (10BASE5), twisted pair cable (10BASET), or fibre
optic cable.
F
Filter Within the router, a filter is a process used to select which packets will be
processed by the router, and which will be ignored or discarded. Selection may be based
on addresses or protocol type.
Firewall A system or combination of systems that enforces a boundary between two or
more networks.
FLASH A new memory technology, which combines the nonvolatile features of
EPROMs with the easy in-system reprogramming of conventional volatile RAM. See
EPROM.
G
Gateway The original Internet term for what is now called router or more precisely, IP
router. In modern usage, the term “gateway” and “application gateway” refers to systems,
which perform translation from some native protocol, or physical data format to another.
Examples include electronic mail gateways, which translate between X.400 and RFC 822
mail message formats. See router.
H
Host An (end-user) computer system that connects to a network, such as a PC,
minicomputer of mainframe.
I
ICMP Internet Control Message Protocol. The TCP/IP protocol used to handle errors
and control messages at the IP layer. ICMP is part of the IP protocol. Gateways, routers
and hosts use ICMP to send reports of problems about datagrams back to the original
source that sent the datagram.
Interface One of the physical ports on the router, including the Ethernet and
asynchronous ports.
Interface type The type (Ethernet or Point-to-Point) of one of the interfaces on the router.