MIT course, CS144, Week 1, LPM

On each hop of each packet, a router decides which link to forward the packet over. x表示任意一個number, wildcards（百搭牌）。dash(/)後面的數字代表block size，爲子網掩碼，32-掩碼爲主機位數。因爲子網掩碼錶示從前往後多少位爲1. Longest prefix match Now,

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