[問題] 一題網路的問題
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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