Question

When troubleshooting Domain Name System (DNS) problems, which helpful feature do public servers usually support?​

Answer 1

Answer:

ICMP echo request

Explanation:-

Network administrator or manager should understand what ICMP or Internet Control Message Protocol is. Although this is often a misunderstood protocol, ICMP knowledge comes in handy if you want to understand routing. Among the core concepts of this protocol that you should understand are ICMP echo request and echo reply. And known as ping packets, ICMP echo requests are sent or received using the ping command. An ICMP echo request often means that the host to which the message is addressed should reply directly to the packet using an echo reply. Basically an echo request often includes a set of data that you can specify using the ping command. When a host makes an echo reply, all the data in the ICMP echo request will be sent back. Notably, whenever the basic connectivity operations fail, one of the most basic tests that the users opt to perform is to verify if the remote system attached to their client machines is up and running. This is where the ICMP query messages come into play. These messages are vital tools for network testing and troubleshooting applications. The user sends an ICMP Echo Request message to the remote destination system, with the system replying with an ICMP Echo Reply message to deliver the feedback. According to RFC 1122, each host must implement the ICMP Echo server, making this is Urgently.

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