【正确答案】 C

【答案解析】[解析] 命令ping检查到其他主机的连接性，下面是这个命令的完整输出：
C:/＞ ping 172.16.10.2
Pinging 172.16.10.2 with 32 bytes of data:
Reply from 172.16.10.2: bytes=32 time＜1ms TTL=128
Reply from 172.16.10.2: bytes=32 time＜1ms TTL=128
Reply from 172.16.10.2: bytes=32 time＜1ms TTL=128
Reply from 172.16.10.2: bytes=32 time＜1ms TTL=128
Ping statistics for 172.16.10.2:
Packets: Sent= 4, Received= 4, Lost= 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum= 0ms, Maximum= 0ms, Average= 0ms