Caching also uses resources more efficiently, including intranet Web servers. This is especially true if groups of employees are accessing the same Internet or intranet Web sites, thereby increasing the probability of cache hits. In almost all cases, operating these clients through a proxy server dramatically improves performance. Look for the following when identifying client acceleration sites: When planning the implementation of proxy servers and caching on your network, you must identify which sites would benefit from caching. The proxy server caches URLs, HTML pages, and FTP files to accelerate subsequent requests to the same objects. The proxy server makes requests to Web servers for the intranet clients, using appropriate protocols such as HTTP, FTP, and Gopher. This eliminates the delay that occurs when the origin Web site is accessed and minimizes the traffic between the corporate network and the Internet. The proxy server intercepts requests from clients for Web pages and supplies the requested pages to the client, if cached, at LAN speed. In Web client acceleration, the proxy server is located between clients and the Internet, as shown in the following figure. Web Client Acceleration (Standard Proxy Cache) For each type of caching, examples are given for both intranet and Internet use. In these examples, Acme Company is implementing several proxy cache solutions to enhance its enterprise network: client acceleration, server acceleration, and network acceleration. This section also provides several examples of how you can use caching.
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