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Internet-wide security update put on hold over fears 60 million people would be kicked offline

Charles 9 Silver badge

"Are there more layers of DNS ( like managers) . some group of "master servers"?"

Yes. DNS is hierarchical in nature with varying levels. The "master servers" are the 13 root servers at the top of the hierarchy. It's THEIR keys that are being changed, and each layer down needs to copy or everything below them can go dark.

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