Which device is known to access services made available by a server?

The device that is known to access services made available by a server is a client. In networking, a client typically refers to a computer or software application that requests services, resources, or data from a server. Clients initiate communication with servers to utilize the services they provide, such as file storage, database access, or web hosting.

For instance, when you use a web browser to visit a website, your browser acts as a client, sending requests to the web server that hosts the site. The server then processes these requests and sends the appropriate responses back to the client, allowing you to view web pages or download files.

In contrast, a router directs traffic between different networks and does not access server resources. Switches operate at the data link layer to connect devices within the same network and facilitate communication between them, while bridges serve to connect separate network segments at the data link layer. Neither routers, switches, nor bridges fulfill the role of accessing server services as clients do. Thus, the definition and functionality of a client make it the correct answer for this question.