题目内容

Howdoesusingtheservicepasswordencryptioncommandonarouterprovideadditionalsecurity?()

A. byencryptingallpasswordspassingthroughtherouter
B. byencryptingpasswordsintheplaintextconfigurationfile
C. byrequiringentryofencryptedpasswordsforaccesstothedevice
D. byconfiguringanMD5encryptedkeytobeusedbyroutingprotocolstovalidateroutingexchanges
E. byautomaticallysuggestingencryptedpasswordsforuseinconfiguringtherouter

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下列关于硫酸盐的描述中不正确的是:()。

A. 硫酸盐在自然界中分布广泛
B. 天然水中硫酸盐的浓度可能从每升几毫克至每升数干毫克
C. 地表水和地下水中的硫酸盐主要来源于岩石土壤中矿物组分的风化和溶淋
D. 岩石土壤中金属硫化物的氧化对天然水体中硫酸盐的含量无影响

Whichthreeofthesestatementsregarding802.1Qtrunkingarecorrect?()

A. 802.1QnativeVLANframesareuntaggedbydefault.
B. 802.1Qtrunkingportscanalsobesecureports.
C. 802.1Qtrunkscanuse10Mb/sEthernetinterfaces.
D. 802.1Qtrunksrequirefull-duplex,point-to-pointconnectivity.
E. 802.1QtrunksshouldhavenativeVLANsthatarethesameatbothends.

ACiscorouterisbootingandhasjustcompletedthePOSTprocess.ItisnowreadytofindandloadanIOSimage.Whatfunctiondoestherouterperformnext?()

A. Itcheckstheconfigurationregister.
B. ItattemptstobootfromaTFTPserver.
C. Itloadsthefirstimagefileinflashmemory.
D. ItinspectstheconfigurationfileinNVRAMforbootinstructions.

在OSI模型的哪层运用RSTP用来防止循环?()

A. 数据链路
B. 网络
C. 物理
D. 传输

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