Can anyone elucidate how the client can discharge the bigger TTL of their own DNS result for that shorter period with CloudDNS? Or is that a given DNS design s

Can anyone elucidate how the client can discharge the bigger TTL of their own DNS result for that shorter period with CloudDNS? Or is that a given DNS design such that a client too must wait for its longer DNS TTL to lapsed from its own cache before benefiting from CloudDNS?