Exam 300-410 topic 1 question 46 discussion

For those like me who don't what is IP Event Dampening : The IP Event Dampening feature introduces a configurable exponential decay mechanism to suppress the effects of excessive interface flapping events on routing protocols and routing tables in the network. This feature allows the network operator to configure a router to automatically identify and selectively dampen a local interface that is flapping. Dampening an interface removes the interface from the network until the interface stops flapping and becomes stable. Configuring the IP Event Dampening feature improves convergence times and stability throughout the network by isolating failures so that disturbances are not propagated. This, in turn, reduces the utilization of system processing resources by other devices in the network and improves overall network stability. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_pi/configuration/xe-16-11/iri-xe-16-11-book/iri-pi-event-damp.html

Why cisco create this type of questions, i read completely the Enarsi book from cisco press and this is not writed in that book.

C is correct

Interface state changes occur when interfaces are administratively brought up or down or if an interface changes state. Every interface state change requires all affected devices in the network to recalculate best paths, install or remove routes from the routing tables, and then advertise valid routes to peer routers. An unstable interface that flaps excessively can cause other devices in the network to consume substantial amounts of resources for recalculations. The IP Event Dampening feature introduces a configurable mechanism to suppress the effects of excessive interface flapping events on routing protocols and routing tables in the network.

The given answer is correct

The given answer is correct