Vendor-neutral DNS fundamentals for MSP techs.
Domains and DNS sit underneath almost every customer ticket: web isn't loading, email won't send, the verification step won't go through. This track takes you from 'I don't really know DNS' to 'I can reason about any DNS change before I make it'. Record types, registrars, mail authentication, propagation, transfers, and the change requests that look harmless but aren't.
Build the four-layer mental model (registrar, DNS host, web host, mail host), work through domain registration end to end, then become fluent in the daily-bread A/AAAA/CNAME/MX/TXT records and TTL discipline the helpdesk touches every shift.
Less-common DNS records (SRV, CAA, NS delegation, PTR), the lookup-tools toolbelt (dig, nslookup, Resolve-DnsName), and applying SPF, DKIM, and DMARC from a vendor's setup wizard.
Registrar and DNS-host transfers, mail-vs-web migration independence, TTL lowering as the universal pre-flight, the DNSSEC safe-disable checklist, and the judgement calls (cardinal sins, reversibility test, calibrated escalation) that prevent client outages.