Proxy Server as a Computer with External Access

A proxy server is a computer that acts as an intermediary between a user and the internet. It can be used for a variety of purposes, including improving security, performance, and accessibility. In this context, the correct answer to the given question is option 'A' - a proxy server is used as the computer with external access.

Explanation:

A proxy server is typically used to manage and control internet traffic between a user and the internet. It intercepts requests from the user and forwards them to the internet on behalf of the user. Similarly, it intercepts responses from the internet and forwards them back to the user. This process allows the proxy server to perform various functions, such as filtering content, caching frequently accessed content, and providing anonymity to the user.

One of the primary functions of a proxy server is to provide external access to the user. This means that the user can access resources on the internet that would otherwise be unavailable due to restrictions or limitations. For example, a user in a corporate network may not be able to access certain websites or services due to a firewall or security policy. However, if the user connects to a proxy server that is located outside the corporate network, they may be able to access those resources.

Another benefit of using a proxy server for external access is improved performance. By caching frequently accessed content, a proxy server can reduce the amount of time it takes to retrieve data from the internet. This can be particularly useful for large files or media content that would otherwise take a long time to load.

In conclusion, a proxy server is a computer that provides external access to the internet for the user. It can be used for a variety of purposes, including improving security, performance, and accessibility.