采用换填垫层法处理湿陷性黄土时，可以采用的垫层为()。

A. Configure the switch to be in VTP client mode.

B. Configure the switch to be in VTP domaint mode.

C. Configure the switch to be in VTP transparent mode.

D. Configure the switch to be in VTPv2.

A.admissioncontrol

B.DSCPclassification

C.monitoring

D.marking

E.scheduling

A. proxy.

B. dual-stack

C. tunneling

D. dot1q

A. when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.

B. unkown unicast frames are retransmitted only to the ports that belong to the same vlan

C. ports between switches should be configured in access mode so that vlans can span across the ports

D. broadcast and multicast frames are retransmitted to ports that are configured on different vlan.

A.minimumbandwidthguarantee

B.averagebandwidthguarantee

C.optimumbandwidthguarantee

D.maximumbandwidthrate

E.IPprecedenceFpriority

A. session

B. network

C. physical

D. data link

E. transport

AcmeCompanyhasofficesaroundthecountry.WiththeuseofCiscoUnifiedCallManager，thecompanyhasdeployedaVoIPnetworkinamultisitecentralizedconfiguration.WhichIOSgatewayfeatureshouldbedeployedtoenableVoIPdevicestoregisterwithalocalgatewayandcontinuetofunctionwhentheconnectiontotheCiscoUnifiedCallManagerisbroken？（）

A.gatekeepermultizone

B.CallAdmissionControl（CAC）

C.AutomaticAlternateRouting（AAR）

D.SurvivableRemoteSiteTelephony（SRST）

A.PIM-SSM

B.Aggregationmulticast

C.PIM-Bidirectional

D.OORhandling

E.integratedmulticast

F.MulticastNSF

A.ARP

B.manualassignment

C.DHCPv6

D.auto-configuredbasedonthe48-bitMACaddress

E.auto-generatedpseudo-randomnumber

A.VPNtrafficneedstobeclassifiedbasedontheLayer2headerinformation

B.VPNtrafficneedstobeclassifiedbasedontheIPprecedenceorDSCP

C.VPNtrafficneedstobeclassifiedbasedonIPfloworLayer3information，suchassourceanddestinationIPaddress

D.VPNtrafficwithAuthenticationHeader（AH）needstopreservetheToSbyte