UnicastReversePathForwarding（Urpf）canworkinthefollowingmodes：（）
A. Expressmode
B. Strictmode
C. Loosemode
D. Tunnelmode
E. Safemode
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WhatIOScommandsdisplayMPLSlabelmappingonanLSR？（）
A. Showmplsforwading-table
B. Showmplsldpbindings
C. Showmplsldpneighbordetail
D. Showmplsldpparameters
E. Showmplsldpdiscovery
WhenshouldtrafficshapingbeimplementedonFrameRelayPVCs？（）
A. WhenyouwanttodropexcesstrafficabovetheCIR
B. Whenthereisaspeedmismatchbetweenthecentralsiteandtheremotesite
C. WhenusingFrameRelaySVCs
D. Whenover-subscribingthecentralsitelink
E. WhenLLQisimplementedontheFrameRelayPVC
F. WhenMultilinkPPPLFIisimplementedontheFrameRelayPVC
WhichfouroftheseareMPLSlabelheaderfields？（）
A. Label
B. VPIVCI
C. EXP
D. TTL
E. FCS
F. Sflag
Allsecuredomainrouters（SDRs）havesharedattributesandresources.WhichthreeresourcesaresharedamongallSDRs？（）
A. SNMPtraps
B. fabriccards
C. exec-levelconfiguration
D. privilege-levelconfiguration
E. admin-levelconfiguration
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