When creating or updating a vnet using Azure CLI you can set DNS servers (using --dns-servers command) - however there does not appear to be a way to reset this back to the Azure-provided DNS using the Azure CLI (other than using a generic update argument to remove dhcpOptions?).

This is possible on a network interface -

`
Command
az network nic update : Update a network interface.

Arguments
--accelerated-networking : Enable accelerated networking. Allowed values: false, true.
--ip-forwarding : Enable IP forwarding. Allowed values: false, true.
--network-security-group : Name or ID of the associated network security group.
--no-wait : Do not wait for the long-running operation to finish.

DNS Arguments
--dns-servers : Space-separated list of DNS server IP addresses. Use ""('""' in
PowerShell) to revert to default Azure servers.
`

Solution -

Use same solution as above for a vnet (--dns-servers ""('""') or add flag (--az-provideddns) to reset DNS back to Azure provided DNS.

Additional note - update the DNS arguments note or documentation on how to revert when using bash?