HP StorageWorks Enterprise File Services WAN Accelerator Deployment Guide (November 2005)

116 GLOSSARY
NIS. Network Information Services. A naming service that allows resources to
be easily added, deleted or relocated.
OSPF. Open Shortest Path First. An interior gateway routing protocol
developed for IP networks based on the shortest path first or link-state
algorithm. Routers use link-state algorithms to send routing information to all
nodes in an internetwork by calculating the shortest path to each node based
on a topography of the Internet constructed by each node. Each router sends
that portion of the routing table (keeps track of routes to particular network
destinations) that describes the state of its own links. It also sends the complete
routing structure (topography).
Packet. A unit of information transmitted, as a whole, from one device to
another on a network.
Probe. A small utility program that is used to investigate, or test, the status of
a system, network or web site.
Policy. Routing and Quality of Service (QoS) scheme that forwards data
packets to network interfaces based on user-configured parameters.
Port. A pathway into and out of the computer or a network device such as a
hub, switch, or router. On network devices, the ports are for communications,
typically connecting Ethernet cables or other network devices.
Router. A device that forwards data packets from one LAN or WAN to
another. Based on routing tables and routing protocols, routers read the
network address in each transmitted frame and make a decision on how to
send it based on the most expedient route (traffic load, line costs, speed, bad
lines, etc.). Routers work at Layer-3 in the protocol stack, whereas bridges and
switches work at the Layer-2.
SMB. Server Message Block. A message format used by DOS and Windows to
share files, directories and devices. There are also a number of products that
use SMB to enable file sharing among different operating system platforms. A
product called Samba, for example, enables UNIX and Windows machines to
share directories and files.
SNMP. Simple Network Management Protocol. A network protocol that
provides a way to monitor network devices, performance, and security and to
manage configurations and collect statistics.
Switch. A network device that filters and forwards frames based on the
destination address of each frame. The switch operates at Layer-2 (data link
layer) of the Open System Interconnection (OSI) model.
TCP. Transmission Control Protocol. The error correcting Transport layer
(Layer-4) in the TCP/IP protocol suite.
TCP/IP. Transmission Control Protocol/Internet Protocol. The protocol suite
used in the Internet, intranets, and extranets. TCP provides transport
functions, which ensures that the total amount of bytes sent is received
correctly at the other end. TCP/IP is a routable protocol, and the IP part of
TCP/IP provides this capability.