Directly Connected Networks

C

The correct answer is C: when an interface on the router is configured with an IP address and enabled.

A routing table is a data structure used by routers to determine where to send packets. It contains information about networks and the paths to reach them.

When a router has an interface configured with an IP address, it means that the router is directly connected to that network. For example, if a router has an interface configured with IP address 192.168.1.1/24, it means that the router is directly connected to the network 192.168.1.0/24.

When a packet is received on that interface, the router can look up the destination IP address in its routing table. If the destination IP address belongs to a network that is directly connected to the router, the router can send the packet directly to that network without needing to send it to another router.

So, a routing table entry is identified as directly connected when the router has an interface configured with an IP address and enabled, and the destination IP address belongs to a network that is directly connected to that interface.

Option A is incorrect because the local router being used as the network default gateway does not necessarily mean that the route is directly connected.

Option B is incorrect because the network residing on a remote router that is physically connected to the local router would mean that the route is not directly connected.

Option D is incorrect because a route that is statically assigned to reach a specific network does not necessarily mean that the route is directly connected.