20.3.6 Packet Tracer – Use the ping Command || Cisco Network Academy || Use of PING Command

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Theory:

• Most of these utilities are provided by the operating system as command line interface (CLI) commands.
• The syntax for the commands may vary between operating systems.
• Some of the available utilities include:
• ipconfig – Displays IP configuration information.
• ping – Tests connections to other IP hosts.
• netstat – Displays network connections.
• tracert – Displays the route taken to the destination.
• nslookup – Directly queries the name server for information on a destination domain.
The ping Command
• Most used network utility
• Tests whether or not network devices are reachable
• Echo request message used to send the packet
• Echo reply verifies connectivity
• Request timed out or general failure is an indication of failure
• A ping to a name like www.cisco.com verifies not only connectivity, but DNS as well.
Ping Results
• If neither a ping to an IP address, nor a ping to the name is successful, then network connectivity along the path to the destination is most likely the problem.
• Try to ping the default gateway.
• If the ping to the default gateway is successful, the problem is not local.
• If the ping to the default gateway fails, the problem resides on the local network.
• A ping may fail due to the firewall on the sending or receiving device, or a router along the path that is blocking the pings.

Divide and Conquer with ping

• Use a divide-and-conquer technique to isolate the problem to either the wired or the wireless network.
• Ping from a wired or wireless client to the default gateway. This verifies if the client is connecting as expected.
• Ping from the wireless client to a wired client. This verifies if the wireless router is functioning as expected.

#PING #ddzala #CISCO

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