单项选择题

Whichdescriptionaboutasymmetricencryptionalgorithmsiscorrect？（）

A.Theyusethesamekeyforencryptionanddecryptionofdata.
B.Theyusedifferentkeysfordecryptionbutthesamekeyforencryptionofdata.
C.Theyusedifferentkeysforencryptionanddecryptionofdata.
D.Theyusethesamekeyfordecryptionbutdifferentkeysforencryptionofdata.

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ArouterisconnectedtoanHDLCcircuitviaaT1physicalinterface.TheSLAforthislinkonlyallowsforasustainedrateof768kb/s.Burstsareallowedforupto30secondsatuptolinerate，withawindowTcof125ms.WhatshouldtheBcandBesettingbewhenusinggenerictrafficshaping？（）
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A.TheSLAforthislinkonlyallowsforasustainedrateof768kb/s.Burstsareallowedforupto30secondsatuptolinerate，withawindowTcof125ms.WhatshouldtheBcandBesettingbewhenusinggenerictrafficshaping？（）
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