Which of the following is NOT a component of a proxy service listener?

The functionality of a proxy service listener is foundational to how a proxy server handles incoming connections and processes requests. Typically, a service listener is characterized by three primary components:

1. Protocol type - This indicates the type of traffic that the listener is designed to handle, such as HTTP or HTTPS, defining the communication protocols supported by the listener.

2. Port number - This specifies the network port on which the listener awaits incoming requests. Different services utilize different ports for communication; for example, HTTP commonly uses port 80 and HTTPS uses port 443.

3. Connection limits - This component defines how many concurrent connections the listener can handle. It plays a crucial role in preventing overload and ensuring stable performance under traffic conditions.

While "proxy type" may refer to the kind of proxy being utilized (such as forward, reverse, or transparent), it is not considered a core component that defines a service listener itself. Rather, it describes the broader category of proxy services that may operate on the listener's underlying components. This distinction makes it clear why the proxy type does not qualify as a fundamental element of a proxy service listener.