Compaq 222863-001 TaskSmart W2200 Administration Guide - Page 125

Ping, Port, Port Number, Presentation Layer, Proxy Server

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Glossary 11 Ping A utility used to determine whether a network destination is online by sending an echo request and waiting for a response. Port The point at which devices can be connected to computers or networks for transmitting or receiving data. Port Number A 16-bit number local to the client that is used by TCP/IP. Port numbers are used in conjunction with an IP address to identify a connection end-point. To obtain TCP service, a connection must be explicitly established between a port/IP address pair on the sending machine and a port/IP address pair on the receiving machine. Presentation Layer See International Standards Organization Reference Model for Open Systems Interconnection. Proxy Server In an enterprise that uses the Internet, a proxy server is a server that acts as an intermediary between a workstation user and the Internet so that the enterprise can ensure security, administrative control, and caching service. A proxy server is associated with, or is part of, a gateway server that separates the enterprise network from the outside network and a firewall server that protects the enterprise network from outside intrusion. A proxy server receives requests for Internet services (such as a webpage request) from a user. If the request passes filtering requirements, the proxy server, assuming it is also a cache server, looks in its local cache of previously downloaded webpages. If it finds the page, it returns it to the user without needing to forward the request to the Internet. If the page is not in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own IP addresses to request the page from the server out on the Internet. When the page is returned, the proxy server relates it to the original request and forwards it on to the user.

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Glossary
11
Ping
A utility used to determine whether a network destination is online by sending
an echo request and waiting for a response.
Port
The point at which devices can be connected to computers or networks for
transmitting or receiving data.
Port Number
A 16-bit number local to the client that is used by TCP/IP. Port numbers are
used in conjunction with an IP address to identify a connection end-point. To
obtain TCP service, a connection must be explicitly established between a
port/IP address pair on the sending machine and a port/IP address pair on the
receiving machine.
Presentation Layer
See
International Standards Organization Reference Model for Open Systems
Interconnection.
Proxy Server
In an enterprise that uses the Internet, a proxy server is a server that acts as an
intermediary between a workstation user and the Internet so that the enterprise
can ensure security, administrative control, and caching service. A proxy
server is associated with, or is part of, a gateway server that separates the
enterprise network from the outside network and a firewall server that protects
the enterprise network from outside intrusion.
A proxy server receives requests for Internet services (such as a webpage
request) from a user. If the request passes filtering requirements, the proxy
server, assuming it is also a cache server, looks in its local cache of previously
downloaded webpages. If it finds the page, it returns it to the user without
needing to forward the request to the Internet. If the page is not in the cache,
the proxy server, acting as a client on behalf of the user, uses one of its own IP
addresses to request the page from the server out on the Internet. When the
page is returned, the proxy server relates it to the original request and forwards
it on to the user.