Section Map
This section covers Amazon Route 53 — AWS's managed DNS service. It starts with DNS fundamentals and builds up to advanced routing policies and health checks.
| # | Topic | Key Concepts |
|---|---|---|
| 01 | What is DNS? | DNS hierarchy, FQDN, recursive resolution, TLD, SLD, name servers |
| 02 | Route 53 Overview | Hosted zones (public/private), record types (A, AAAA, CNAME, NS), domain registration, EC2 setup |
| 03 | Records and TTL | Time To Live, caching behavior, high vs low TTL trade-offs |
| 04 | CNAME vs Alias | Zone apex restriction, Alias targets, free queries, health check support |
| 05 | Routing Policies | Simple, Weighted, Latency-based routing |
| 06 | Health Checks & Failover | Endpoint checks, calculated checks, CloudWatch Alarm checks, Failover routing |
| 07 | Advanced Routing Policies | Geolocation, Geoproximity (bias), IP-based, Multi-Value |
| 08 | Third-Party Domains | Domain registrar vs DNS service, using Route 53 with GoDaddy, section cleanup |
Key Exam Topics
- Alias vs CNAME — zone apex, free queries, valid targets
- Routing policies — when to use each (Weighted for canary, Latency for performance, Geolocation for localization, Geoproximity for traffic shifting)
- Health checks — endpoint, calculated, CloudWatch Alarm (for private resources)
- Failover routing — primary/secondary, mandatory health check on primary
- 100% availability SLA — only AWS service with this guarantee
Check yourself
Quiz