公開 Web サイトの A レコードが更新された後、一部の訪問者が Web サイトにアクセスできなくなりました。この問題に対処するには、次のうちどれを調整する必要がありますか?
正解:A
When a client gets a DNS reply from a query, it will store it locally (cached) for a period of time to reduce the number of lookups on the DNS servers. In each DNS reply there is a field called TTL, or time to live. This instructs the client how long to store the replay before requesting again. This allows us to reduce the network workload and keep the DNS data fresh on the client. All devices use a cache system that stores the requests locally for a period of time and the time to live (TTL) value tells the client how long that should be.