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某网络中PC1无法访问域名为www.aaa.cn的网站,而其他主机访问正常,在PC1上执行ping命令时有如下所示的信息:   
C:>ping www.aaa.cn  
Pinging www.aaa.cn[202.117.112.36] with 32 bytes of data:    
Reply from 202.117.112.36: Destination net unreachable.
Reply from 202.117.112.36:Destination net unreachable.
Reply from 202.117.1 12.36:Destination net unreachable.
Reply from 202.1 17.112.36: Destination net unreachable.
Ping statistics for 202.117.112.36:
Packets: Sent=4,Received=4,Lost=O(0% loss),
Approximate round trip tunes in milli-seconds:
Minimum=0ms, Maximum=0ms, Average=0ms
造成该现象可能的原因是(  )。