What are two base components of both a source-based remotely triggered black hole and a destination- based remotely triggered black hole filtering solution? (Choose two.)

NetFlow is a traffic telemetry and accounting tool used to observe flows; it plays no role in the forwarding-plane drop mechanism required by RTBH.

The static route to Null0 is the black hole itself - it must exist on all enforcing routers so that when the triggered next hop is resolved, traffic matching the prefix is silently discarded rather than forwarded.

Infrastructure ACLs protect routing and management plane resources and are a completely separate security construct not involved in the RTBH trigger-and-drop architecture.

A triggered iBGP update advertising a predetermined unused IP address as the BGP next hop is the signaling mechanism that distributes the black hole instruction from the trigger router to all other participating routers in the network.

uRPF is specifically required for source-based RTBH to validate and drop packets whose source address is tagged for black-holing, but it is not a component of destination-based RTBH and therefore not common to both variants.