Câu 58: 640-875: Building Cisco Service Provider Next-Generation Networks Part 1 (SPNGN1)

Which two statements about Packet over SONET are true? (Choose two.)

1. A. POS is a Layer 2 technology that uses PPP in ATM encapsulation and SONET framing.
2. B. The Layer 2 frame is encapsulated into a generic HDLC header (not Cisco proprietary HDLC) and placed into the appropriate SONET Payload Envelope. — đáp án hiện tại
3. 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.
4. D. The Cisco POS interface supports Cisco HDLC and PPP encapsulation. — đáp án hiện tại
5. E. POS can be used in a point-to-point or point-to-multipoint environment.