某網絡中PC1無法訪問域名為www.aaa.cn的網站，而其他主機訪問正常，在PC1上執(zhí)行ping命令時有如下所示的信息：  
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
造成該現(xiàn)象可能的原因是(53)。
A.DNS服務器故障
B.PC1上TCP/lP協(xié)議故障
C．遭受了ACL攔截
D.PC1上hternet屬性參數(shù)設置錯誤