-The Domain Name System (DNS) has evolved significantly from its original design as specified in {{RFC1035}}. While traditional DNS operates over unencrypted UDP and TCP connections on port `53`, modern DNS deployments increasingly use encrypted transports to provide confidentiality and integrity. These secure protocols include DNSCrypt {{!I-D.denis-dprive-dnscrypt}}, DNS-over-TLS (DoT) {{RFC7858}}, DNS-over-HTTPS (DoH) {{RFC8484}}, DNS-over-QUIC (DoQ) {{RFC9250}}, and Oblivious DNS-over-HTTPS {{ODOH}}.
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