多项选择题

Which two implementations are standard Virtual Private LAN Service （VPLS） implementations that aresupported by the IETF？（）

A.VPLS uses LDP for signaling.
B.VPLS uses BGP for autodiscovery and signaling.
C.VPLS uses extended IS-IS for signaling
D.VPLS uses OSPF version 3 for auto discovery and signaling
E.VPLS uses spanning tree for signaling

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单项选择题

In the IS-IS Designated Intermediate System （DIS） election process， which criteria is used for DIS selection？（）

A.highest router ID first， then highest priority
B.highest MAC address first， then highest priority
C.highest router ID first， then highest MAC address
D.highest priority first， then highest router ID
E.highest priority first， then highest MAC address

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

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