Which feature of proxy servers enables the retention of a copy of frequently requested web pages to speed up subsequent requests?

Which feature of proxy servers enables the retention of a copy of frequently requested web pages to speed up subsequent requests?

• A. Caching engines
• B. Non-transparent proxy
• C. Transparent proxy
• D. Reverse proxy

Answer: (A)

Caching is the mechanism at work here. A proxy server with a caching engine stores copies of frequently requested web pages so that subsequent requests can be served from the local cache instead of reaching the original server. This speeds up responses, reduces bandwidth, and lowers load on the destination. The cache uses headers like Cache-Control, Expires, and ETag/If-Modified-Since to determine when content is still fresh or needs revalidation. While transparent/non-transparent and reverse proxies describe how the proxy is positioned or interacts with clients and back-end servers, the feature that directly enables retaining copies for faster access is caching.

Caching is the mechanism at work here. A proxy server with a caching engine stores copies of frequently requested web pages so that subsequent requests can be served from the local cache instead of reaching the original server. This speeds up responses, reduces bandwidth, and lowers load on the destination. The cache uses headers like Cache-Control, Expires, and ETag/If-Modified-Since to determine when content is still fresh or needs revalidation. While transparent/non-transparent and reverse proxies describe how the proxy is positioned or interacts with clients and back-end servers, the feature that directly enables retaining copies for faster access is caching.