Google Interview Question: if you do a configuration on CNAME (part of the postini service) does it matter if use capital or small letters?

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if you do a configuration on CNAME (part of the postini service) does it matter if use capital or small letters?

Anonymous

17 Aug 2010

Comment: *BLONK*

Anonymous

24 Nov 2016

DNS is case insensitive.

Anonymous

17 June 2018

A Record and MX record, are case sensitive. DNS vaues for SPF and TXT are also case sensitive. Rest of the DNS entries are case-INsensitive. RFC4343