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D-6 Glossary and Index
normally used with lower-layer protocols like Ethernet, while packet is
associated with higher layer protocols like IP and IPX. p. A-11.
Gateway 1. In TCP/IP jargon, a gateway is the same as a router (see
Router). 2. A device that converts one higher-level network protocol to
a different higher level protocol (for example, a LAT-to-TCP/IP
gateway). pp. 4-18, 4-21
Hops The number of routers that are located between two devices, such
as the print server and the file server. pp. 12-7, 12-9.
Host Computer A computer that provides services to one or more
users.
Hosts File The file on a UNIX host computer (usually in the /etc
directory) that contains a list of host computers on the network). pp. 4-2
to 4-3.
HP/UX The variation of UNIX that runs on Hewlett-Packard
computers. pp. 4-4, 4-6, 4-7.
Hub 1. A multiport repeater for connecting several network segments
together; this term is usually associated with 10baseT networks. 2. A
sophisticated network device consisting of a chassis plus several plug-in
boards, including bridges, routers, 10baseT hubs, and other devices. p
2-13.
IEEE International Electronics and Electrical Engineers, a standards
body that controls the specifications for Ethernet and other networking-
related standards.
IETF Internet Engineering Task Force; the group that defines the de
facto standards for TCP/IP.
I/O Slot Input/Output slot; in printers, a place where network interface
cards like the TROY XCD XJet are mounted.
IOP Internal Option Port; the bus used on Lexmark 4039 and Optra
Series printers to connect network interface cards like the TROY XCD
XMark.