In IP networking, an endpoint is defined as

• A. a gateway router
• B. a broadcast domain
• C. an application server
• D. source or destination of an IP packet

Answer: (D)

In IP networking, an endpoint is the device at the ends of a communication—the source or the destination of an IP packet. Each IP packet has a source and a destination address that identify the endpoints involved in that exchange. A gateway router is a forwarding device that connects networks and routes packets between them, not the endpoint of a specific packet. A broadcast domain describes the scope over which broadcast frames propagate, not the endpoints of a particular packet. An application server can be an endpoint, but the most precise definition is any host that originates or terminates IP traffic, which aligns with the idea of the source or destination of an IP packet.