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154 Glossary
Glossary
Instead of forwarding the request to the Web server where Page 1
resides, which can be a time-consuming operation, the proxy server
returns the Page 1 it already fetched for user X. Since the proxy server is
often on the same network as the user, this is a much faster operation.
Real proxy servers support hundreds or thousands of users.
Filter Requests: Proxy servers can also be used to filter requests. For
example, a company might use a proxy server to prevent its employees
from accessing a specific set of Web sites.
R router
A device that connects any number of LANs. Routers use headers and a
forwarding table to determine where packets go. They use Internet
Control Message Protocol (ICMP) to communicate with each other and
configure the best route between any two hosts. Very little filtering of data
is done through routers. Routers do not care about the type of data they
handle. Routers often have DHCP Server capability.
RS-232
Short for recommended standard-232C, a standard interface approved
by the Electronic Industries Association (EIA) for connecting serial
devices. The standard is also referred to as RS-232C, or just RS-232.
For RS-232, the device that connects to the interface is called a Data
Communications Equipment (DCE) and the device to which it connects
(such as a computer) is called a Data Terminal Equipment (DTE).
The RS-232 standard supports two types of connectors - a 25-pin D-type
connector (DB-25) and a 9-pin D-type connector (DB-9). The type of
serial communications used by PCs requires only 9 pins so either type of
connector will work equally well.
S server
Part of the client/server model used in distributed computing. The server
is a computer system designated to act as a main servicer of requests
from other client computer systems, such as I/O application requests,
networking requests, and so forth.
SICL
The Agilent Standard Instrument Control Library, which is software used
for I/O application programming. SICL is part of the Agilent IO Libraries
Suite.