Does CNAME mask subdomains?

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Say I create the following records:

; zonefile for
www             IN      CNAME   us-east-1.dynamic
staging.www     IN      CNAME   us-east-2.dynamic
admin.www       IN      A
  1. Should and be accessible, assuming no bugs in my authoritative server or the client resolver?

  2. In practice, will the latter two records function on industry-standard software (Bind9 server; Windows/Cloudflare/systemd clients; etc.)?


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