pingコマンドの説明します。
説明
pingは、他のコンピュータと疎通確認をするコマンドです。
使い方：ping
読み方：ピン
略：packet internet grouper
具体例
＃ google.comと疎通確認
[root@CE08PRD101 work]# ping -c 5 google.com
PING google.com(nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e)) 56 data bytes
64 bytes from nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e): icmp_seq=1 ttl=117 time=14.4 ms
64 bytes from nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e): icmp_seq=2 ttl=117 time=13.2 ms
64 bytes from nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e): icmp_seq=3 ttl=117 time=12.9 ms
64 bytes from nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e): icmp_seq=4 ttl=117 time=13.6 ms
64 bytes from nrt12s15-in-x0e.1e100.net (2404:6800:4004:807::200e): icmp_seq=5 ttl=117 time=13.2 ms
--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 330ms
rtt min/avg/max/mdev = 12.949/13.459/14.358/0.512 ms