Which of the following devices would be the MOST efficient way to filter external websites for staff
on an internal network?

A.
Protocol analyzer

B.
Switch

C.
Proxy

D.
Router

Explanation:
A proxy is a device that acts on behalf of other devices. All internal user communications with the
Internet could be controlled through a proxy server, which can be configured to automatically filter
out or block certain sites and content. It can also cache often-accessed sites to improve
performance.