Using dig +trace to understand DNS resolution from start to finish – IBM Blog

Understanding glue records and Dedicated DNS

3 min read – Domain name system (DNS) resolution is an iterative process where a recursive resolver attempts to look up a domain name using a hierarchical resolution chain. First, the recursive resolver queries the root (.), which provides the nameservers for the top-level domain(TLD), e.g.com. Next, it queries the TLD nameservers, which provide the domain’s authoritative nameservers. Finally, the recursive resolver  queries those authoritative nameservers.   In many cases, we see domains delegated to nameservers inside their own domain, for instance, “example.com.” is delegated…

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• Source: https://www.ibm.com/blog/using-dig-trace/