2. Requirements Language

The RFC uses the BCP 14 key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL as defined in RFC 2119 and RFC 8174, but only when they appear in all capitals.

This matters because much of the document is operational guidance, while the capitalized terms define the actual normative requirements for NQB senders, NQB PHB nodes, traffic protection, DSCP treatment, Wi-Fi mapping, and the RFC 8325 update.