Which two requirements are necessary before a router configured with a link-state routing protocol can build and send its link-state packets?

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#1

Which two requirements are necessary before a router configured with a link-state routing protocol can build and send its link-state packets? (Choose two.)

  1. The router has determined the costs associated with its active links.*
  2. The router has built its link-state database.
  3. The routing table has been refreshed.
  4. The router has established its adjacencies.*
  5. The router has constructed an SPF tree.