What is the function of a proxy server?

A proxy server functions primarily as an intermediary between a client and the internet. Its main roles include providing anonymity for users and filtering content based on predefined policies or restrictions. When a user sends a request for resources from the internet, the request first goes to the proxy server, which then relays the request to the destination server. This process effectively masks the user's IP address, enhancing privacy and providing a level of security.

Additionally, proxy servers can implement content filtering, which allows organizations to block access to certain websites or types of content, enforcing usage policies and protecting users from harmful sites. By controlling which requests are fulfilled and which are blocked, proxy servers play a vital role in managing internet access within networks.

The other options do not accurately represent the role of a proxy server. Blocking all network traffic is not a function of a proxy server; rather, it would completely prevent any data passing through, which is not its purpose. Connecting devices in a local network is typically handled by switches or routers, not proxy servers. Lastly, while proxy servers can cache data temporarily to speed up access to frequently requested resources, they are not designed for permanent data backup storage. Thus, the role of a proxy server is appropriately encapsulated in the choice that highlights its function as