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Which two statements about RSTP and MSTP BPDUs are true? (Choose two.)
Correct Answer: A,C
Explanation/Reference: A switch running both MSTP and RSTP supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If this switch receives a legacy 802.1D configuration BPDU (a BPDU with the protocol version set to 0), it sends only 802.1D BPDUs on that port. An MST switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2). Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12- 1_9_ea1/ configuration/guide/scg/swmstp.html