Domain Name System¶
Resolve a name deliberately, predict cache behavior, and roll out record changes without guessing.
Topics¶
| # | Topic | Practice outcome |
|---|---|---|
| 01 | DNS Resolution Flow | Trace stub, recursive, and authoritative resolution. |
| 02 | Record Types | Choose records that match the routing requirement. |
| 03 | DNS Load Balancing | Understand what DNS can and cannot balance. |
| 04 | DNS Caching and TTL | Predict propagation and stale-answer windows. |
| 05 | GeoDNS and Anycast | Compare location-based answers with routed anycast. |
Practice loop¶
Query from at least two resolvers, inspect the authoritative answer and TTL, then write the expected old/new answer window before changing a record.