单项选择题

Which statement about Remotely Triggered Black Hole （RTBH） is true？（）

A.Route tagging is one of the techniques used by RTBH
B.It is used for BGP authentication
C.It cannot work with static routes
D.It uses extended ACLs for blocking attacks by creating a black hole
E.Before configuring RTBH LDP must be enabled on the interface

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单项选择题

What is one of the primary overhead fields associated with the Optical Payload Unit （OPU）？（）

A.path monitoring
B.tandem connection monitoring activation deactivation （TCM ACT）
C.Payload Structure Identifier （PSI）
D.multiframe alignment signal （MFAS）
E.section monitoring

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Which statement about MPLS traffic engineering policy-based tunnel selection （PBTS） is not true？（）

A.The tunnel that is not configured with the policy-class command acts as the default
B.EXP selection is between multiple tunnels to the same destination
C.There is no requirement for IGP extensions
D.Tunnels are configured using the policy-class command and carry multiple EXP values
E.It supports VRF traffic， IP-to-MPLS switching， and MPLS-to-MPLS switching

单项选择题

What is the label for MPLS over ATM？（）

A.VPI 16
B.DLCI
C.VPI and VCI
D.circuit number
E.PVC and SVC