[多选] Which of these statements about penultimate hop popping are true？（）

A . It is used only for directly connected subnets or aggregate routes
B . It can only be used with LDP.
C . It is only used when two or more labels are stacked.
D . It enables the Edge LSR to request a label pop operation from Its upstream neighbors
E . It is requested through TDP using a special label value that is also called the implicit-null value.
F . It is requested through LDP using a special label value that is also called the implicit-null value.

后付军运客票填写时不填甲联。（）纪事本末体 What are two important guidelines to follow when implementing VTP？（） CDPmust be enabled on all switches in theVTP management domain.。 All switches in the VTPdomain must run the same version of VTP.。 When using secure mode VTP， only configure management domain passwords onVTP servers.。 EnablingVTP pruning on a server willenable the feature for the entire management domain.。 Use of theVTPmulti-domain feature should be restricted to migration and temporary implementation.。旅客自行改晚乘车，如遇所改成的列车晚点2小时以上，其车票有效。（）心情一致性 Which of these statements about penultimate hop popping are true？（）

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[多选] Which of these statements about penultimate hop popping are true？（）

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