推 forris:把 ip 跟 mask 做 AND,就是答案. (應該是 A 吧) 05/31 23:03
→ vekfvz:我也覺得答案是1..但又怕是我的盲點，有人支持總是比較放心 06/01 00:11
21.Given a host IP address 140.117.12.121 with a mask 255.255.255.248,
what is the host's network number？
(A)140.117.12.120 (B)140.117.12.121 (C)140.117.12.127 (D)140.117.12.128
答案是b
請問要怎麼計算呢？
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