[問題] 子網路問題

[child47 (child47)]

If three bits are borrowed from host field of a class C network ,

what will the rangeof usable hosts be in the first subnet?

(a).32 through 0.63

(b).0 through .32

(c).33 through 0.62

(d).1 through .31


答案是(a)，為何不是0~31呢？(雖然沒有這個選項)

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→ xsque:答案d吧...
→ xsque:沒事...看錯  應該c吧
→ xsque:要問可用的  應該要去頭去尾吧
→ xsque:不過 我又想想 或許比較新的題目不用去了吧= =
推 Likefeeling:怎麼一堆人都說D??
→ xsque:直覺都選D吧 可是D頭去尾沒去 可以這樣去法嗎?高手請指教
→ child47:(C)選項不是第一個subnet
→ child47:我看另一本考題答案是無解，它解1 through 30
推 Likefeeling:1~30 沒有錯 0跟31不可以使用...