关于数字签名的描述中，错误的是（)。A．通常能证实签名的时间B．通常能对内容进行鉴别C．必须采用DSS

A.one

B.two

C.three

D.four

E.five

F.six

A.generalcommunicationchannel0（GCC0）

B.sectionmonitoring

C.reserved（RES）

D.generalcommunicationchannels1and2（GCC1GCC2）

E.tandemconnectionmonitoringactivationdeactivation（TCMACT）

A.ItisgeneratedbyanASBRandindicatesthereachabilitytoanABRlocatedinanotherarea.

B.ItisgeneratedbyABRandindicatesthereachabilitytoanASBRlocatedinanotherAS.

C.ItisgeneratedbyABRandindicatesreachabilitytoitself.

D.ItisgeneratedbyABRandindicatesthereachabilitytoanASBRlocatedinanotherarea.

E.ItisgeneratedbyASBRandindicatesthereachabilitytoanABR.

A. The PC has connectivity with a local host.

B. The PC has connectivity with a Layer 3 device.

C. The PC has a default gateway correctly configured

D. The PC has connectivity up to Layer 5 of the OSI model

E. The PC has the TCP/IP protocol stack correctly installed.

A.AutoQoScanbeconfiguredfromadifferentsubinterfaceiftheDLCIisalreadyassignedtoonesubinterface

B.MultilinkPPP(MLP)overFrameRelaymustbemanuallyconfiguredonlowspeedDLCIs

C.forlow-speedFrameRelayDLCIswithFrameRelay-toATMinterworking,theAutoQoScannotbeconfiguredifavirtualtemplateisalreadyconfiguredfortheDLCI

D.AutoQoScanbeconfiguredonaFrameRelayDLCIonlyifamapclassisattachedtotheDLCI

A.allactiveAVFroutersasthefirstresponseisusedbytheclient

B.theAVGrouter，replyingwithadifferentAVFMACaddresseachtime

C.arandomAVFrouter，basedonaGLBPseedhashkey

D.onlytheAVGrouterthatreceivedtheARPrequestfirst

A.Class-basedModel

B.MaximumAllocationModel

C.RussianDollModel

D.GlobalTunnelModel

E.Policy-basedModel

A. by encrypting all passwords passing through the router

B. by encrypting passwords in the plain text configuration file

C. by requiring entry of encrypted passwords for access to the device

D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges

E. by automatically suggesting encrypted passwords for use in configuring the router