Glossary
Alternates
Different versions of the same web object. Some web servers answer requests to the same URL with a variety of objects. The content of these objects can vary widely, depending on whether a server delivers content for different languages, targets different browsers with different presentation styles, or delivers variable content at different times of the day.
ARM
Adaptive Redirection Module. Used in transparent proxy caching, ARM is an Intel NetStructure Cache Appliance component that redirects intercepted client traffic destined for an origin server to the Intel NetStructure Cache Appliance application. Before the traffic is redirected by the ARM, it is intercepted by an L4 switch or router.
Cache
Stores copies of frequently accessed objects close to users and serves them to users when requested. See also Object store.
Cache hierarchy
Levels of caches that communicate with each other. All cache hierarchies recognize the concepts of Parent cache and Child cache.
Cache hit
An object in the cache that can be served directly to the client.
Cache miss
An object that is not in the cache or that is in the cache but no longer valid. In both cases, the Intel NetStructure Cache Appliance must get the object from the Origin server.
Caching web proxy server
A web proxy server with local cache storage that allows the proxy to fulfill client requests locally, using a cached copy of the origin server’s previous response.
CGI
Common Gateway Interface. A set of rules that describe how a web server and another piece of software (a CGI program) located on the same machine communicate.
The most common directory name on a web server in which CGI programs are stored.
Child cache
A cache lower in a Cache hierarchy for which the Intel NetStructure Cache Appliance is a parent. See also Parent cache.
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