4456对于网络号172.19.26.0/17,它的子网掩码是:A.255.255.128.0B.255.255.252.0C.255.255.192.0D.2556529

对于网络号172.19.26.0/17,它的子网掩码是: A.255.255.128.0 B.255.255.252.0 C.255.255.192.0 D.255.255.126.0 请帮忙给出正确答案和分析,谢谢!

答案解析