题目内容
(请给出正确答案)
[主观题]
IP地址60.178.30.120/30的子网掩码是()
A.255.255.255.0
B.255.255.255.240
C.255.255.255.252
D.255.255.0.0
暂无答案
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A.255.255.255.0
B.255.255.255.240
C.255.255.255.252
D.255.255.0.0
A.172.21.20.8/30
B.172.21.20.6/30
C.172.21.20.9/30
D.172.21.20.4/30
B. 255.255.248.0
C. 255.255.240.0
D. 255.255.252.0
E. 255.255.255.0