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Emphasised system questions around managed DNS 

Added more verbosity on how questions on questions around managed DNS can arrive during interviews.
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Diljit PR 2019-04-19 05:33:32 +05:30 committed by GitHub
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@ -553,6 +553,8 @@ Services such as [CloudFlare](https://www.cloudflare.com/dns/) and [Route 53](ht
* Latency-based
* Geolocation-based
Managed DNS Services such as [CloudFlare](https://www.cloudflare.com/dns/) and [Route 53](https://aws.amazon.com/route53/) are very common during interviews these days. System design questions may revolve around managing mulitple availability zones of your application (e.g. like amazon.in and amaazon.com) and how would you route users to their appropiate geographical location depending on their source, so emphaize on these concepts more.
### Disadvantage(s): DNS
* Accessing a DNS server introduces a slight delay, although mitigated by caching described above.