题目内容

WhichofthefollowingstatementsthatdescribeDiffieHellmanKeyexchangearecorrect？（）

ADHkeyexchangeisanalgorithmthatutilizesasymmetriccryptographickeys.
B. TheDHkeyexchangeisusedtoestablishasharedsecretoveraninsecuremediumduringanIPSecphase1exchange.
C. TheDHexchangeissusceptibletoman-in-the-middleattacks.
D. TheDHexchangeisusedtoauthenticatethepeerdeviceduringanIPSecphase1exchange.
E. ADHexchangeprovidesPerfectForwardSecrecy（PFS）.

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Which two options are valid WAN connectivity methods？（）

A. PPP
B. WAP
C. DSL
D. Ethernet
E. L2TPv3

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如果样品含有较多的有机物质和悬浮物，要测定总量银，水样应在现场加硝酸酸化，使PH<2.带回实验室后，在分取试液前，应充分摇匀水样，立即分取适量含有悬浮物的混合水样于100ml烧杯中，加（）消解，并蒸发至冒浓厚白烟将尽。

A. HNO3-HCIO4-H2O2
B. HNO3-HCIO4-HCI-H2O2
C. HNO3+H2SO4-H2O2
D. HNO3-HF-H2O2

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WhichstatementaboutMPLStrafficengineeringpolicy-basedtunnelselection（PBTS）isnottrue？（）

A. Thetunnelthatisnotconfiguredwiththepolicy-classcommandactsasthedefault
B. EXPselectionisbetweenmultipletunnelstothesamedestination
C. ThereisnorequirementforIGPextensions
D. Tunnelsareconfiguredusingthepolicy-classcommandandcarrymultipleEXPvalues
E. ItsupportsVRFtraffic，IP-to-MPLSswitching，andMPLS-to-MPLSswitching

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Whatarethemandatory，well-knownBGPattributes？（）

A. origin，AS-path，next-hop
B. AS-path，origin，MED
C. AS-path，origin，weight
D. AS-path，weight，MED

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