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In an effort to keep CISA.gov current, the archive contains outdated information that may not reflect current policy or programs.Addressing DNS Resolution on Federal Networks
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The purpose of this memorandum is to remind agencies of their legal requirement to use EINSTEIN 3 Accelerated (E3A)’s Domain Name System (DNS) sinkholing capability for DNS resolution and to provide awareness about recent security and privacy enhancements to DNS resolution protocols – in particular, DNS over HTTPS (DoH) and DNS over TLS (DoT).