Cisco Systems 566 Manual De Usuario

Otherwise, the Content Engine simultaneously obtains the requested objects from 
the web server, stores a copy of the objects (caches them), and forwards the 
objects on to the user.

You can also configure your Content Engine as a proxy server that acts as a 
network gateway device, which is optimized to retrieve content on behalf of web 
clients. Direct proxy routing is known as nontransparent caching because the web 
clients and media players in the network are configured to explicitly point to the 
Content Engine that is acting as the proxy server.

Unlike transparent caching, nontransparent caching is possible even if your 
network does not support Cisco IOS software and the WCCP.

In nontransparent caching cases, the Content Engine sends the content to the web 
client from its local storage if the requested content is already available at that 
location (cache hit). If the requested content is not already stored in the Content 
Engine’s local cache (cache miss), the Content Engine retrieves the requested 
content from the origin server, stores a local copy of the content if the content is 
cacheable, and sends the requested content to the web client. When the Content 
Engine receives subsequent requests for the same content, it sends the content 
from its local storage. 

By caching web objects, the Content Engine can speed the completion of user 
requests when more than one user wants to access the same objects. Caching in 
this manner also reduces the amount of traffic between your network and the 
Internet, potentially improving your overall network performance and optimizing 
your bandwidth usage.

This section illustrates and describes the front and back panel controls, ports, and 
LED indicators on the CE-511 and CE-566.