OSPF Hello Packet and Device State Transition in Juniper Networks

The OSPF Hello Packet State Transition

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Question

To which OSPF state does a device transaction once it receives an initial hello packet?

Answers

Explanations

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A. B. C. D.

A

When a device running OSPF receives an initial Hello packet from a neighboring device, it enters the "Init" state. The Init state is a temporary state, and the device remains in this state until it receives a response from the neighboring device.

Once the device receives a response to its Hello packet, it transitions to the "2-Way" state. In the 2-Way state, the device has determined that the neighboring device is also running OSPF and is reachable via the network.

After the 2-Way state, the device transitions to the "ExStart" state. In the ExStart state, the devices exchange information about their databases, including their LSDB (link state database). This information exchange allows the devices to determine if they have any new or updated information that needs to be exchanged.

Once the ExStart state is complete, the devices move to the "Exchange" state. In the Exchange state, the devices exchange their LSAs (link state advertisements) and begin to synchronize their databases.

Finally, once the Exchange state is complete, the devices move to the "Full" state. In the Full state, the devices have fully synchronized their databases and are ready to begin exchanging routing updates.

Therefore, the correct answer to the question is A. 2-Way.