CompTIA Security+ Question C-41

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

Answer: C

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.