The router that runs OSPF first enters the Full state and then synchronizes the LSDB.

The statement is incorrect because it reverses the order of events in the OSPF neighbor state machine. LSDB (Link-State Database) synchronization occurs during the Exchange and Loading states. Only after the LSDBs are fully synchronized do the neighboring routers transition to the Full state, which signifies that they are fully adjacent and their databases are identical. The sequence is: Exchange -> Loading -> Full.

The option "True" is incorrect. A router must first exchange Database Description (DBD) packets (Exchange state) and then request and receive any missing or updated Link State Advertisements (LSAs) (Loading state) to build an identical LSDB. The Full state is the final, stable state achieved after synchronization is complete.

1. Huawei, HCIA-Datacom V1.0 Training Material (2020), Section "OSPF Neighbor Relationship Establishment", pp. 2-67 to 2-69. The material explicitly details the state machine: "In Exchange state... In Loading state... After the LSDBs of the two routers are synchronized, the neighbor relationship enters the Full state."

2. Moy, J., "OSPF Version 2", RFC 2328, The Internet Society (April 1998), Section 10.1 "The Neighbor State Machine". This foundational document states, "In this state [Loading], Link State Request packets are sent to the neighbor asking for the more recent LSAs that have been discovered in the Exchange state... Adjacencies are fully functional only when they are in the Full state."