Which three 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.

时间:2022-09-05 14:13:07 所属题库:CCIE系列认证综合练习题库

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