The ICMP protocol provides a number of functionalities that enable network desig

Question

The ICMP protocol provides a number of functionalities that enable network designers to analyze whether the network has been set up and designed properly.

Imagine that you work as a network engineer and you have just set up a network with brand-new routers and switches to house 150 users. Identify some of the ICMP-based network commands that you would use to verify that your network is set up and working properly. How can you verify that you have configured the most appropriate default gateway settings for your hosts?

Explanation / Answer

After setting up the network newly, the first and foremost thing to verify is the connectivity between the computers and the outside network.The most important commant=d to verify the connectivity is Ping command which uses ICMP messages.Ping is a tool that helps to verify IP-level connectivity; PathPing is a tool that detects packet loss over multiple-hop trips. When troubleshooting, the ping command is used to send an ICMP Echo Request to a target host name or IP address. Ping commnd is used to verify that a host computer can send IP packets to a destination host. Ping tool can also be used to isolate network hardware problems and incompatible configurations
The gateway address must be on the same network as the local host; if not, no messages from the host computer can be forwarded to any location outside the local network. We need to check to make sure that the default gateway address is correct as entered. Finally, we need to see that the default gateway is a router, not just a host, and that it is enabled to forward IP datagrams.We can verify the default gateway reachability with ping command.We can check by pinging the remote host, if everything is OK we should get the response from the remote host.

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