单项选择题
A.20 B.25 C.69 D.80
A.110.33.24.58 B.66.200.12.33 C.210.41.224.36 D.127.0.0.1
A.交叉线B.直连线C.反转线D.六类线
A.no auto-summary B.auto-summary C.no ip router D.ip router
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