A route learned from a neighboring router using OSPF appears in the route table with which letter?

• A. O
• B. C
• C. D
• D. S

Answer: (A)

In the routing table, the letter shown at the start of a route indicates the source of that route. A route learned from a neighbor using OSPF is labeled with the letter O. This marks it as an OSPF-learned route rather than a directly connected network (C), a static route (S), or a route learned from another protocol like EIGRP (D). So the O code is the designation for OSPF routes.