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Which two statements about Packet over SONET are true?

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Which two statements about Packet over SONET are true? (Choose two.)
A. POS is a Layer 2 technology that uses PPP in ATM encapsulation and SONET framing.
B. The Layer 2 frame is encapsulated into a generic HDLC header (not Cisco proprietary HDLC) and placed into the appropriate SONET Payload Envelope.
C. The FCS field can be set to 16 bits on one end and 32 bits on the other end of a POS connection without causing any connectivity issues.
D. The Cisco POS interface supports Cisco HDLC and PPP encapsulation.
E. POS can be used in a point-to-point or point-to-multipoint environment.
Correct Answer: BD

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