Wildcard, DNAME e DNS inverso

Wildcards, DNAME, and reverse DNS

A wildcard record such as *.example.test can answer for names that do not have a closer match, but it is not a blanket rule that overrides every existing name. Wildcard behavior depends on the DNS tree and can surprise operators who expect it to cover every missing label.

DNAME redirects a subtree at the DNS naming level: names below one node are mapped under another node. It differs from CNAME, which aliases an individual owner name. Reverse DNS uses zones such as in-addr.arpa for IPv4 and ip6.arpa for IPv6; PTR records map reverse names to host names but do not prove identity.

References: RFC 6672 — DNAME · RFC 1035 — inverse queries

Check your understanding

Choose the best answer. The examples use training names and do not send real DNS queries.

Quiz#dns.m12.l3.e1

Which statement about PTR is correct?

PTR is cryptographic proof of identityPTR lives in reverse zones and maps an address to a namePTR replaces A and AAAA