643-832选择题概念性题

tmackobealle

各位大虾，题库里的这种概念性题只需考试时怎么做丫？没有让几个选择，答案给出了，是要记住这个答案？还是考试时有别的多选项呢？
$ i7 Q7 M; k( A$ j+ M# B不懂，如下面的一个题库里的题。给的答案：
$ `2 J' G9 D: ]0 J2 h  PYou 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
1 r' v6 p- Z- Q# G) F2 O3 L( P0 {server before falling back to 10.1.1.1. Which command will you use?
Answer:
ntp server 10.1.1.1
ntp server 10.1.1.2 prefer
(notice the answer with the word “prefer”)