Which two events will trigger the sending of a link-state packet by a link-state routing protocol?

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#1

Which two events will trigger the sending of a link-state packet by a link-state routing protocol? (Choose two.)

  1. the router update timer expiring
  2. a link to a neighbor router has become congested
  3. **a change in the topology ***
  4. the initial startup of the routing protocol process*
  5. the requirement to periodically flood link-state packets to all neighbors