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.)

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.)

• The router has determined the costs associated with its active links.
• The router has built its link-state database.
• The routing table has been refreshed.
• The router has established its adjacencies.
• The router has constructed an SPF tree.

Explanation: Once a router has established its adjacencies, it can build its link-state packets (LSPs) that contain the link-state information, including the link cost. A router can only build a link-state after it has received link-state packets from adjacent routers. It then constructs its SPF tree from the least cost routes to remote networks which are used to populate its routing table.

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