The Company XYZ network requires OSPF dead neighbor detection in a subsecond manner. However, the company network does not support BFD. Which other feature can be used to fulfill the design requirement?
A - In the absence of BFD, you would select fast hellos, simple. The sub second dead timer requirement is unachievable with the options available, for which only A is valid. LFA is for re-convergence after a loss of route, not to use instead of BFD or fast hellos.
Answer is D, guys focus on in a subsecond matter which is not supported by fast hello as the dead interval can't be changed to less than 1 sec, while LFA can change to alternative path within 50ms.
Loop Free Alternates (LFA) is a mechanism by which a neighbor can be used as a backup next hop to provide a local repair path for the traffic to flow temporarily in case of failures in the primary next hop (node or link).
DPD is a method used by devices to verify the current existence and availability of IPsec peers.
The OSPF Support for Fast Hello Packets feature provides a way to configure the sending of hello packets in intervals less than 1 second (sub second). Such a configuration results in faster convergence in an Open Shortest Path First (OSPF) network.
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