How does a Client Verify if the DNS server is Alive or down

[Matus UHLAR - fantomas]

On 20.10.15 11:56, Harshith Mulky wrote:
>How can a Client verify if the DNS Server is Running(named service is Running) or Down?

Why should client know such info?
The clients needs to have the answer - it sends message and if the server
replies properly, it's up and running.

>Does it periodically send any messages to the server. What Kind of messages
> are required by the client to be sent towards server to determine if the
> DNS IP is reachable or not?

what is your problem?

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