What are the two purposes of an OSPF router ID? (Choose two.)

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Question:
What are the two purposes of an OSPF router ID? (Choose two.)

to uniquely identify the router within the OSPF domain
to facilitate router participation in the election of the designated router
to enable the SPF algorithm to determine the lowest cost path to remote networks
to facilitate the establishment of network convergence
to facilitate the transition of the OSPF neighbor state to Full

Explanation: OSPF router ID does not contribute to SPF algorithm calculations, nor does it facilitate the transition of the OSPF neighbor state to Full. Although the router ID is contained within OSPF messages when router adjacencies are being established, it has no bearing on the actual convergence process.

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