RFC 3958:Domain-Based Application Service Location...
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requirement


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... It MAY choose to run simultaneous DDDS resolutions for more than one protocol, in which case the requirements above apply for each protocol independently. That is, do not switch protocols mid- ...


... Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. ...



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