單項選擇題

對于這樣幾個網(wǎng)段:172.128.12.0,172.128.17.0,172.128.18.0,172.128.19.0,最好用下列哪些網(wǎng)段實現(xiàn)路由匯總?()

A.172.128.0.0/21
B.172.128.17.0/21
C.172.128.12.0/22
D.172.128.20.0/20

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