JN0-649 Exam Dumps | In OSPF, how does a router ensure that LSAs advertised to a neighboring router are received?

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Question 6/28

In OSPF, how does a router ensure that LSAs advertised to a neighboring router are received?

A. LSA flooding guarantees that all routers will receive them successfully.

B. LSAs are sent over a TCP connection.

C. LSAs are acknowledged by the neighboring router.

D. LSAs are advertised with an acknowledgement bit.

Correct Answer: C

* OSPF Protocol Basics:
* OSPF (Open Shortest Path First) is a link-state routing protocol.
* Routers exchange LSAs (Link-State Advertisements) to share topology information.
* LSA Acknowledgment Mechanism:
* OSPF uses a reliable mechanism to ensure LSAs are received.
* When a router sends an LSA to a neighbor, it expects an acknowledgment (ACK).
* If an ACK is not received within a certain period, the router will retransmit the LSA.
* Acknowledgment Process:
* LSAs are sent over OSPF's reliable transport, which ensures delivery through acknowledgments.
* This mechanism helps to maintain consistent and up-to-date topology databases across routers.
References:
* OSPF RFC 2328
* Understanding OSPF Operations

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