If you receive a sufficient number of up-votes, yes. I would recommend using simple language, and avoid digressing too deeply in to networking concepts. Keep in mind that HN is full of hackers, but it's also full of product people, sales people, and new-comers.

This is a good high-level write up for people who might know a little about how DNS works because they've configured a domain, but don't know a lot of detail about the different record types. I can see how a lot of people would find it interesting.

Yes. Part 2 could cover CNAMEs.

You don't even need to address common problems or have any remotely interesting commentary whatsoever!