ccnp eigrp 问题咨询

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2. Router R1 has working interfaces S0/0, S0/1, and S0/2, with IP address/prefix combi-
nations of 10.10.10.1/24, 10.10.11.2/24, and 10.10.12.3/22. R1’s configuration includes
the commands router eigrp 9 and network 10.0.0.0. The show ip eigrp interfaces
command lists S0/0 and S0/1 in the command output, but not S0/2. Which answer
gives the reason for the omission? (Choose two answers.)
a. R1 has EIGRP neighbors reachable via S0/0 and S0/1, but not via S0/2, so it
is not included.
b. S0/2 may currently be in a state other than up/up.
c. The network 10.0.0.0 command requires the use of mask 255.0.0.0 due to
EIGRP being classful by default.
d. S0/2 may be configured as a passive interface.

这道题是642-902认证指南学习材料中的题目，题目的官方答案是选B，姑且不说答案个数的问题，我通过实际测试，这道题的答案d是绝对正确，至于B，测试结果显示，即使S0/2端口关闭，但是用show ip eigrp interfaces这条命令显示结果中还是有S0/2端口的信息，这一点与选项不符合。望高手解惑。

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