单项选择题

WhichistheresultofenablingIPSourceGuardonanuntrustedswitchportthatdoesnothaveDHCPsnoopingenabled？（）

A.DHCPrequestswillbeswitchedinthesoftware，whichmayresultinlengthyresponsetimes.
B.TheswitchwillrunoutofACLhardwareresources.
C.AllDHCPrequestswillpassthroughtheswitchuntested.
D.TheDHCPserverreplywillbedroppedandtheclientwillnotbeabletoobtainanIPaddress.

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TherearenobootsystemcommandsinarouterconfigurationinNVRAM.WhatisthefallbacksequencethattherouterwillusetofindanIOSduringreload?（）

A.TFTPserver,Flash,NVRAM
B.ROM,NVRAM,TFTPserver
C.NVRAM,TFTPserver,ROM
D.Flash,TFTPserver,ROM
E.Flash,NVRAM,ROM

单项选择题

Whichstatementistrue，asrelatestoclassfulorclasslessrouting？（）

A.Automaticsummarizationatclassfulboundriescancauseproblemsondiscontinuoussubnets
B.EIGRPandOSPFareclassfulroutingprotocolsandsummarizeroutesbydefault
C.RIPv1andOSPFareclasslessroutingprotocols
D.Classfulroutingprotocolssendthesubnetmaskinroutingupdates