In routing tables, a route that is directly attached to the router’s interface is indicated by which letter?

• A. C
• B. S
• C. D
• D. O

Answer: (A)

A route that is directly attached to the router’s interface is shown as a connected route. This means the destination network is reachable through one of the router’s own interfaces because the router has an IP address on that interface. Such routes are created automatically whenever you assign an IP address to an interface and the interface is up, so the network is reachable without traveling through any other device. They typically have the lowest administrative distance, making them the most trusted type of route in the table. The other markings denote routes learned from elsewhere: static routes you configure manually, or dynamic routes learned via routing protocols like EIGRP or OSPF.