What’s on the DNS poster
A 7-row table: Record · Points to · Used for.
The record types you will actually configure.
- A — IPv4 address — The main mapping
- AAAA — IPv6 address — Same, for IPv6
- CNAME — Another name — Aliases — never at the apex
- MX — Mail server — Email routing
- TXT — Free text — Verification, SPF, DKIM
- NS — Name servers — Delegating a zone
- CAA — Certificate authority — Who may issue certs
TTL controls caching. Lower it hours before a planned migration, or the old answer lingers as long as the old TTL.
Questions about the DNS poster
- What’s on the DNS poster?
- A 7-row table: Record · Points to · Used for. The record types you will actually configure. A — IPv4 address — The main mapping; AAAA — IPv6 address — Same, for IPv6; CNAME — Another name — Aliases — never at the apex; MX — Mail server — Email routing; TXT — Free text — Verification, SPF, DKIM; NS — Name servers — Delegating a zone; CAA — Certificate authority — Who may issue certs. TTL controls caching. Lower it hours before a planned migration, or the old answer lingers as long as the old TTL.
- Who is the DNS poster for?
- DNS belongs to the Computing section rather than to a school year, because computing is not something one grade owns. Anyone learning systems can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the DNS poster?
- When a site is unreachable but its IP works, it is DNS. It is very often DNS. A wall chart earns its place by being glanceable from where the work is happening, so DNS belongs on the wall where that computing work actually happens, within glancing distance, rather than filed away.
- What other posters go with DNS?
- Caching, Concurrency & Parallelism and Garbage Collection sit alongside DNS in the Computing section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.CachingConcurrency & ParallelismGarbage Collection
- Is the DNS poster free to download and print?
- Yes. DNS downloads as a free PDF with no account, no email and no watermark, like everything else in the Computing section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the DNS poster print at?
- DNS is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of DNS loses nothing.Printing guide
Related posters
Charts that sit alongside DNS on the same wall.
Browse every Computing poster, or start from the full catalogue.