PING cnbc.snu.ac.kr (147.47.223.60) 56(84) bytes of data.
64 bytes from cnbc.snu.ac.kr (147.47.223.60): icmp_seq=1 ttl=54 time=249 ms
64 bytes from cnbc.snu.ac.kr (147.47.223.60): icmp_seq=2 ttl=54 time=249 ms
64 bytes from cnbc.snu.ac.kr (147.47.223.60): icmp_seq=3 ttl=54 time=248 ms

--- cnbc.snu.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2446ms
rtt min/avg/max/mdev = 248.252/248.992/249.538/0.678 ms