Glossary
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E5810B User’s Guide
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.
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Router
Router is 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
Recommended Standard- 232C (RS- 232) is a standard
interface approved by the Electronic Industries Association
(EIA) for connecting serial devices. The standard is referred
to as RS- 232C or RS- 232.
A device that connects to an RS- 232 interface is called a
Data Communications Equipment (DCE) and the device to
which it connects to, such as a computer, is called a Data
Terminal Equipment (DTE).
Summary of Contents for E5810B
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