In article <mailman.43.1472100432.74444.bind-us...@lists.isc.org>, Harshith Mulky <harshith.mu...@outlook.com> wrote:
> I am trying to understand why caching is required on the bind server, when > the client receiving the responses would be caching based on TTL values. A typical caching server has multiple clients. If they're an ISP, it will have thousands of clients, and public DNS servers like OpenDNS and Google DNS it may have hundreds of thousands. So even if the clients have caches of their own (which many do not), the cache is useful so that when different clients look up the same name they can be returned from cache. For example, consider all the thousands of lookups for things like google.com, twitter.com, etc. that an ISP receives every second. If they didn't cache these responses, DNS traffic might rival YouTube (OK, that's an exaggeration). -- Barry Margolin Arlington, MA _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
