PING(ping.exe)

Ping is the most common TCP/IP diagnostics tool, and is used to determine whether a particular host is available. The syntax is ping or ping . It will either return a “Successful access in xxx milliseconds” type, or “Host unreachable”. If accessing a machine by name doesn’t work, but by IP address does, then the DNS servers are not configured properly or the remote DNS server is not working.If a “ping localhost” or “ping 127.0.0.1” comes back as a failure, then TCP/IP networking on the local computer is not working properly and needs looking at.
Ping attempts to connect to port 7 on the remote computer and wait for a reply. Just because a ping fails it doesn’t mean that the host is down though, because many routers/firewalls are configured to block ping requestsfor security reasons.