Telephones used to have a dial. Television viewers used to have to get up to change the channel. Internet connections used to run at 56 kbit/s. And, not so long ago, organizations could run their service from a single data center. Their DNS servers were placed inside it with no contingency plan. After all, if the data center went down, the DNS server was useless. But time and technology march on, and a single data center is now the exception rather than the norm. Enterprises run multiple data centers, sometimes in multiple countries, not to mention cloud regions and highly…
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