DES加密算法采用的密钥长度是（)。A．32位B．56位C．64位D．53位

Refertotheexhibit.RouterElearnedaboutthePIMRP（designatedas7.7.7.7）fromfourdifferentsources.RoutersAandDadvertisedthe7.0.0.0networkviaEIGRP.RoutersBandCadvertisedthe7.0.0.0networkviaOSPF.ConsideringthatallfourEthernetinterfacesonrouterEcouldpotentiallyleadbacktothePIM-RP，whenrouterEreceivesthefirstmulticastpacketdownthesharedtree，whichincominginterfacewillbeusedtosuccessfullypasstheRPFcheck？（）

A.E0

B.E1

C.E2

D.E3

E.NoneoftheseinterfaceswillbeusedtosuccessfullypasstheRPFcheck

F.AlloftheseinterfaceswouldsuccessfullypasstheRPFcheck

A.224.0.1.37

B.224.0.1.38

C.224.0.1.39

D.224.0.1.40

A.Addresses are permanently assigned so that the host uses the same address at all times.

B.Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.

C.Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.

D.Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

A.Takeanypacketsourcedfromanyaddressinthe10.2.0.0/16networkordestinedto10.1.14.25andsetthenexthopto10.1.1.1

B.Takeanypacketsourcedfromanyaddressinthe10.2.0.0/16networkanddestinedto10.1.14.25andsetthenexthopto10.1.1.1

C.Nothing；extendedaccesslistsarenotallowedinroutemapsusedforpolicy-basedrouting

D.Dropanypacketsourcedfrom10.2.0.0/16

A.onlythelocalOSPFroutes

B.onlytheOSPFroutesinstalledintheroutingtable

C.onlytheremotelylearnedOSPFroutes

D.alltheOSPFroutesfromtheOSPFdatabasethatareeligibletobeputintheroutingtable

A.ipv6routerripccie distribute-list..

B.ipv6routerripccie offset-list..

C.interfacee0/0 ipv6ripcciedistribute-list..

D.interfacee0/0 ipv6ripccieadvertise..