Which of the following is a feature of a directly connected interface in an IPv4 routing table?

A directly connected interface in an IPv4 routing table features the code 'C'. This code indicates that the route uses a network interface that is directly attached to the router, meaning that the router has a physical link to the destination network. When a routing table displays this code, it informs the router's operating system that the device can reach the mentioned network directly without the need for routing through other networks.

In addition to this, the presence of a directly connected interface simplifies the routing process. The router can send packets out on the interface immediately when it needs to reach devices on that network. This direct connection increases efficiency, as it minimizes latency that might occur with additional hops through intermediary devices.

Other codes represent different types of routes, which may involve more complexity regarding the routing path, but 'C' specifically signifies a straightforward, direct association between the router and a device or network segment. This foundational concept is critical for understanding how devices communicate within a local area network (LAN) and the role of routers in directing traffic effectively.