June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Top-level domain nameservers
The DNS hierarchy flows from an inverted tree that begins at the internet root, which is signified by the .. As we'll see, each . in a hostname or domain name signifies another layer in the tree.
All hostnames terminate with an inferred .; however, they are frequently written without them. Take a look at this diagram:
From right-to-left, each dot in a hostname corresponds to the next level in the inverted DNS tree
The root and top-level domain nameservers are required for resolvers to discover which authoritative nameservers to send any given query to. Now look at this diagram:
The DNS system forms an inverted ...
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