In the OSPF Init State, what occurs after a Hello packet is received?

In the OSPF Init State, when a router receives a Hello packet from a neighboring router, it recognizes that this neighbor is alive and reachable. This action leads to the addition of the neighbor's information to the router's neighbor table. The neighbor table is essential for establishing and maintaining relationships between directly connected OSPF routers, thereby facilitating the subsequent phases of the OSPF adjacency formation process.

After the entry is added, the router will eventually move into the Next state, which is the 2-Way state, if it receives matching Hello packets. This progression ensures that both routers acknowledge each other's existence, allowing them to negotiate the next steps toward forming a full OSPF adjacency.

The other choices describe actions that do not take place immediately after receiving a Hello packet in the Init State. For example, sending a DBD packet typically occurs in the Exchange State, not the Init State. Thus, recognizing that the receipt of a Hello packet directly leads to an entry in the neighbor table clarifies why this is the most accurate answer in the context of OSPF's operation.