[单选] Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label，if the stack bit is set to1，which option is true？（）

A . The stack bit will only be used when LDP is the label distribution protocol
B . The label is the last entry in the label stack.
C . The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.
D . The stack bit is reserved for future use.

When using Overlay Transport Virtualization （OTV）， how do L2 multicast frames traverse the overlay？（） The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transport。 The L2 multicast frames are dropped because multicast cannot be carried across the overlay 。 The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transport。 The L2 multicast frames are forwarded natively across the overlay based on their multicast ID。下列哪一种肉制品含水分最多（）。贡丸。腊肠。肉绒。板鸭。项目的特点包括有（）。一次性。收益性。系统性。目标性。限定性。整体性。关于单板替代关系下面描述正确的有（） RWF可以替代TWF使用。 TWF可以替代RWF使用。 M32可以替代D32使用。 D32可以替代M32使用。 what is the purpose of frame-relay LMI？ Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label，if the stack bit is set to1，which option is true？（）

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[单选] Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label，if the stack bit is set to1，which option is true？（）

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