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全部科目 > 软件认证工程师考试 > 思科认证考试 > CCNA系列认证 > CCNA(650-568)

单项选择题

You are helping the customer customer configure anthentication,a new asyncOS upgradebecomes available,what should you do?() 

A.avoid mentioning the upgrade to the customer
B.schedule a convenient time to upgrade again, backing up the configuration before and after theupgrade
C.contact customer support and ask them to run the upgrade for you
D.immediately show the customer how to run the CLI command upgrade

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