What does the letter O indicate in the routing table?

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

Answer: (A)

In a router’s routing table, each entry shows a code that indicates how that route was learned. The letter O specifically flags routes that came from the OSPF protocol. That means the path was learned dynamically through OSPF’s SPF process, not from a directly connected network (which would be C) and not from a static entry (which would be S). It’s different from how EIGRP routes would appear, which use a different code. So the O indicates the route was learned via OSPF, making it the best answer.