An OSPF router receives an LSA and checks the sequence number of the LSA. This number matches the sequence number of an LSA that the receiving router already has. What does the receiving router do with the received LSA?
IT Exam Items Repository › Category: CCNP ENARSI v9 › An OSPF router receives an LSA and checks the sequence number of the LSA. This number matches the sequence number of an LSA that the receiving router already has. What does the receiving router do with the received LSA?
An OSPF router receives an LSA and checks the sequence number of the LSA. This number matches the sequence number of an LSA that the receiving router already has. What does the receiving router do with the received LSA?
- It sends the newer LSU to the source router.
- It adds the LSA to the database.
- It ignores the LSA.
- It floods the LSA to the other routers.
Explanation: OSPF routers use sequence numbers to determine the "newness" of link-state information. If a received LSA has a sequence number that matches the one already stored in the router's Link-State Database (LSDB), the router recognizes it as a duplicate and ignores the LSA.
Related exam: Checkpoint Exam: Layer 3 Technologies – OSPF
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