This document provides answers to commonly asked questions about OSPF routing protocol. It covers the characteristics of OSPF, the need for dividing the autonomous system into areas, the benefits of dividing the network into areas, and the concept of the backbone area. It also explains the roles of Area Border Router (ABR) and Autonomous System Border Router (ASBR), the OSPF router ID, and the parameters required for two routers to become neighbors. Additionally, it discusses the election of DR and BDR, the various OSPF states, OSPF LSA, LSU, and LSR, and OSPF timers. The document concludes with information on multicast addresses used by OSPF and the tables maintained by OSPF.