C (Both modes use control packets):Regardless of whether echo packets are used, BFD asynchronous mode always relies on periodic transmission of control packets to verify session liveliness.
E (Echo mode uses separate packets):When echo is enabled, the echo packets are transmitted in addition to control packets, providing even faster failure detection by relying on data plane processing.
Other options explained:
A: Control and echo packets are never combined into a single packet.
B: Both modes always use control packets; echo packets are optional.
D: BFD echo packets are locally looped, not reflected back from the remote device.
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