A proxy server receives client requests, forwards them to other servers and then returns the responses to the clients. It can cache frequently accessed resources to improve performance and reduce bandwidth usage. Proxies also help conceal internal IP addresses and can enforce access policies. Thus, the type of server described is a proxy server.
Option A:
Option A, switch, forwards frames within a local network segment and does not act as an application level intermediary between clients and external web servers.
Option B:
Option B is correct because a proxy server is specifically designed to act on behalf of clients when accessing other servers, providing functions such as caching and address hiding.
Option C:
Option C, bridge, connects two network segments and forwards traffic based on hardware addresses without engaging with application level requests.
Option D:
Option D, scanner, usually refers to an input device for images or security software that scans for vulnerabilities, neither of which matches the intermediary server role.
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