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A System p administrator must change the 9.47.53.0 subnet from 128 addresses to 64 addresses. How can the AIX systems in the network be permanently modified to accomplish this（）

A、mktcpip -h hostname -a 9.47.53.x -m 255.255.255.64 -i en0 -g 9.3.230.1
B、ifconfig en0 netmask 255.255.255.64
C、chdev -l en0 -a netmask=255.255.255.192
D、ifconfig en0 netmask 0xffffffc0

正确答案:C

答案解析:有

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