Note
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DNS
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Domain Name System which translates the human friendly hostnames into the machine IP addresses
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DNS is the backbone of the Internet
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DS uses hierarchical naming structure
Terminologies
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Domain Register: Amazon Route 53, GoDaddy, …
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DNS Records: A, AAAA, CNAE
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Zone File: resolves DNS queries (Authoritative or Non-Authoritative)
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Top Level Domain (TLD): .com, .us, .us, .gov, .org …
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Second Level Domain (SLD): amazon, google.com
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Hierarchical Structure
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Top Level Domain (TLD)
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Second Level Domain (SLD)
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Sub Domain
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(Fully Qualified) Domain Name
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Protocol
