You have two NTP servers 10.1.1.1 & 10.1.1.2 and want to configure a router to use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which command will you use？
正确答案:
Ntp server 10.1.1.1
Ntp server 10.1.1.2 prefer
（notice the answer with the word “prefer”）
Ntp server 10.1.1.2 prefer
（notice the answer with the word “prefer”）
答案解析:有
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