What does the letter D indicate in the routing table?

• A. Learned dynamically from another router using the EIGRP routing protocol
• B. Directly connected interfaces
• C. Static routes
• D. Learned dynamically from another router using the OSPF protocol

Answer: (A)

D in the routing table shows a route learned dynamically from another router using the EIGRP protocol. The routing table uses codes to indicate how each route was obtained: D means EIGRP-learned, C means directly connected, S means static, and O means learned via OSPF. This helps you quickly see the source and method behind each entry. If a route came from another protocol or was redistributed, you might see EX for an EIGRP external route, which is a different dynamic source.