Which of the following is a network server that acts as an intermediary between a user's computer and the internet, providing increased security, administrative control, and caching service?
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Answer Description
A proxy server is a network device that accesses servers on the behalf of a client requesting access to the resource. Proxy servers are typically used as intermediaries between clients and web servers. One of the advantages of this is that the server being accessed will not be able to see the IP address of the client.
Wikipedia
In computer networking, a proxy server is a server application that acts as an intermediary between a client requesting a resource and the server providing that resource. It improves privacy, security, and performance in the process.
Instead of connecting directly to a server that can fulfill a request for a resource, such as a file or web page, the client directs the request to the proxy server, which evaluates the request and performs the required network transactions. This serves as a method to simplify or control the complexity of the request, or provide additional benefits such as load balancing, privacy, or security. Proxies were devised to add structure and encapsulation to distributed systems. A proxy server thus functions on behalf of the client when requesting service, potentially masking the true origin of the request to the resource server.
Proxy_server - Wikipedia, the free encyclopedia 