Which of the following server roles isolates internal clients from the servers by downloading and storing files on behalf of the clients?

a. DNS

b. DHCP

c. NTP

d. Proxy Server

d

Explanation:

Proxy Server works by caching (downloading and storing) content from a server requested for by clients so that if another request is made for the same content, the proxy server will serve the client without the need of making the request to the server. This leads to faster delivery of content, efficient bandwidth usage and better security.