DNS maps human-readable names to records (A, AAAA, MX, CNAME, TXT, NS). Resolution is hierarchical: recursive resolvers query authoritative servers from the root (.) downward. Caching TTL reduces load — stale records are a common outage cause after migrations.
Recursive resolution (concept)
Resolver
🌳Root .
📦TLD .com
📚Auth NS
💻Stub client
Content is available with subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.