What are the two purposes of an OSPF router ID?

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#1

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

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