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
相关考题
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单项选择题
WhatisoneoftheprimaryoverheadfieldsassociatedwiththeOpticalPayloadUnit（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 -
单项选择题
WhichstatementaboutMPLStrafficengineeringpolicy-basedtunnelselection（PBTS）isnottrue？（）
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
WhatisthelabelforMPLSoverATM？（）
A.VPI 16
B.DLCI
C.VPI and VCI
D.circuit number
E.PVC and SVC
