Which of the following is used to periodically multicast by DIS on a LAN to ensure IS-IS link state databaseaccuracy？（）

单项选择题MPLSlabelmappingonanLSRisdisplayedbywhichIOScommand？（）

A.Show mpls Idp neighbor detail
B.Show mpls Idp bindings
C.Show mpls Idp parameters
D.Show mpls Idp discovery

多项选择题WhichthreeprotocolsuseTLVstocarryattributes？（）

A.Cisco Discovery Protocol
B.Label Discovery Protocol
C.Border Gateway Protocol
D.OSPF
E.RIP version 2

单项选择题HowmanymessagesdoesinternetKeyExchangeusetonegotiateSAcharacteristicswhenrunninginmainmode？（）

A.3 messages
B.6 messages
C.4 messages
D.2 messages
E.5 messages

多项选择题WhatarethreecommonreasonsforATMCRCerrors？（）

A.Incorrect VPI and VCI configuration
B.Noise， gain hits， or other transmission problems on the data link equipment
C.ATM cells are dropped due to incorrect ATM routing in the service provider.
D.A faulty or failing ATM interface.
E.Cells are dropped due to traffic policing in the ATM cloud on one or more virtual circuits attached to theATM interface

单项选择题WhichModularQoSCLI（MQC）basedoutputqueuingmethodisdesignedtosupportmultipletrafficclassesincludingVoIPtraffic，mission-criticaltraffic，interactivetraffic，anddefaultclasstraffic？（）

A.CBWFQ
B.CB-WRED
C.LLQ
D.Custom Queueing
E.WRR Queueing