Which information elements construct a route?

The correct choice details the fundamental components that define a route in networking. A route is primarily constructed using a destination subnet, which specifies the network or segment that the route points to. The next-hop IP address indicates where packets should be sent next on their way to the destination, serving as the immediate address that will handle the packet next. Additionally, the outgoing interface is crucial as it designates the specific network interface through which packets should exit the device to reach the next hop.

The combination of these elements ensures that routing protocols and devices understand how to direct traffic efficiently across the network. Each component plays a critical role in routing decisions, allowing for effective packet forwarding and delivery.

Other options include elements that do not accurately reflect how routes are constructed. For example, source IP and subnet mask pertain more to the identification of the originating traffic rather than the routing itself. Protocol type, destination port, and path metrics are relevant in different contexts, such as traffic management or performance evaluation, but they do not constitute the basic building blocks of a route. Lastly, the source subnet and configuration mode do not align with the necessary elements required for a routing table entry.