Which term describes a system entity that requests and uses a service from another system entity?

Which term describes a system entity that requests and uses a service from another system entity?

• A. Server
• B. Router
• C. Client
• D. Firewall

Answer: (C)

The idea here is the client–server relationship: the entity that asks for and uses a service from another system is the client. A client initiates the request and consumes the service, while the provider is the server that supplies the resource or functionality in response. A common example is a web browser acting as a client when it requests a web page from a web server. Other options don’t fit this role: a router moves data between networks but doesn’t request services; a firewall controls access and monitors traffic rather than consuming a service; a server provides services but does not typically initiate the request itself.

The idea here is the client–server relationship: the entity that asks for and uses a service from another system is the client. A client initiates the request and consumes the service, while the provider is the server that supplies the resource or functionality in response. A common example is a web browser acting as a client when it requests a web page from a web server.

Other options don’t fit this role: a router moves data between networks but doesn’t request services; a firewall controls access and monitors traffic rather than consuming a service; a server provides services but does not typically initiate the request itself.