400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ224

Control, Data, Management Plane, and Operational Design

Which two statements describe how BFD asynchronous mode operates?

Choose two
  • A BFD asynchronous mode with echo packets uses separate control packets and echo packets
  • B BFD asynchronous mode with and without echo packets use control packets
  • C BFD asynchronous mode with echo packets combines the control packets and echo packets into a single packet
  • D BFD asynchronous without echo packets has control packets sent back to the originating router, which echoes the control packet to detect failures
  • E BFD asynchronous mode without echo packets uses control packets, and BFD asynchronous mode with echo packets does not
Explanation

BFD asynchronous mode without echo relies on peers periodically sending BFD control packets to each other. With echo enabled, BFD sends echo packets in addition to—not combined with—BFD control packets; the peer loops echo packets through its forwarding path for failure detection.

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