Introductory DNS
This talk will begin with a very general introduction to DNS, covering:
- What DNS is
- Why it is important
- How a catastrophic world war might start if it failed
- Who ‘the 13’ are.
After introducing some of the basic record types (A,AAAA,CNAME,MX,NS,SOA), I will present an examination of recursive DNS resolution, including walking through manual examples of different DNS queries. This section will include a discussion of authoritative vs nonauthoritative DNS servers. From this point, if there is time, some other topics that could be covered are:
- DNS hijacking and running your own recursive resolver to avoid this
- More advanced DNS records
- Why CNAME records can cause lots of problems if they are used incorrectly.
- DNS cache poisoning
