What type of server acts as a mediator between a client and an external server?

• A. Proxy Server
• B. Domain Name System
• C. Web Server
• D. Telnet Server

Answer: (A)

Sitting between a client and an external server, a proxy server acts as the middleman that relays requests and responses. That intermediary role is exactly what a proxy provides: it takes the client’s request, forwards it to the destination server, and then returns the server’s response to the client. Proxies can also cache content to speed up repeated requests, enforce security policies, and hide the client’s identity.

The other options don’t fit that intermediary purpose. The Domain Name System helps locate servers by translating human-friendly names into IP addresses, but it doesn’t forward traffic or mediate sessions. A Web server hosts and serves web content in response to requests, acting as the destination rather than the intermediary. A Telnet server provides remote command-line access to a host, not a middleman for general client-to-server communication.