Web Caching Overview - 3Com SUPERSTACK 3 WEBCACHE 3000 User Manual

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Web Caching
Overview
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ACHING ONCEPTS AND
This hop-by-hop process continues until the IP packets reach the remote
destination.
The default router should be a device that is closer than the Webcache to
the WAN link in your network, which the Webcache can send Web
requests to in order to retrieve Web objects from the Internet. The default
router can be a firewall, internet gateway device, router or a switch.
To configure the Webcache, enter the IP address of the default router on
the local subnet in which the Webcache is located. If no default router
exists on your network leave the field blank.
In a network without a Webcache, all Web requests from browsers on
client machines must travel across the expensive WAN to the origin Web
server (the Web server that contains the original copy of the requested
information), and the response from the server must travel back across
the WAN, as shown in
Figure 1 A Typical Web Request
The prime objective of web caching is to store Web content close to the
client machines that request it. This enables the content to be served
more quickly to the end user and reduces the amount of traffic on the
WAN. To achieve this aim, the Webcache is deployed in your LAN
EPLOYMENT
Figure 1: