在某台主机上无法访问域名为wwaaa.cn 的网站，而局域网中的其他主机可正常访问，在该主机 上执行ping命令时有如下所示的信息:
C:>ping wwwaaa.cn:
Pinging www.aaa.cn [202.114.10.56] with 32 bytes of da ta.:
Reply from 202.11410.56: Destination net unreachable:
Reply from 202.114.10.56: Destination net unreachable:
Reply from 202.114.10.56:Destination net unreachable:
Reply from 202.114.10.56: Destination net unreachable:
Ping statistics for 202.114.10.56:
Packets: Sent = 4. Received = 4. Lost 0 (0% loss):
Approximate round trip times in milli-seconds.:
Minimum =Oms,Maximum =Oms,Average =Oms 分析以上信息，可能造成该现象的原因是（ ）