Which three statements are correct about OSPF packet types?

Juniper JN0-351 Question Answer

Which three statements are correct about OSPF packet types? (Choose three.)

Link-state request packets are sent after receiving an LSA header not in the OSPF database.

Link-state acknowledgment packets are sent every 30 seconds.

Hello packets are sent every 30 seconds by default.

Database description packets are used during the adjacency formation process.

Link-state update packets contain one or more LSAs.

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