QuestionQ9

SR OS Control Plane Security

For a link-state routing protocol, which of the following statements regarding link-state updates is FALSE?

  • A When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
  • B When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
  • C Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
  • D The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database
Explanation

An LSA that reaches MaxAge is reflooded so it can be flushed from the routing domain. Routers do not request a new update from the source router merely because an LSA has reached its maximum age. The LS age increments in the link-state database and when copied into a Link State Update packet for flooding. RFC 2328, Section 14

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