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Route53 DNS

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These were the topics I created flashcards for (Remnote) and would revise them using spaced repetition. The formatting is an export from Remnote.

  • An 'Alias' in Route 53 can point to which four resources? ↓
    • S3 sites
    • ELB
    • CloudFront
    • API Gateway
  • Can a CNAME point to an Apex record?―No.
  • Can an ALIAS point to an Apex record?―Yes.
  • What resource in Route 53 hosts DNS records?―Hosted Zone.
  • What kind of Hosted Zone is available to requests OUTSIDE of a VPC?―Public Hosted Zone.
  • What kind of Hosted Zone is only available to requests within a VPC?―Private Hosted Zone.
  • Routing Policies
    • What are the 6 available Route 53 routing policies? ↓
      • Simple
      • Multi-value
      • Weighted
      • Latency Based
      • Geolocation
      • Geoproximity
    • Can Simple Routing Policy return multiple DNS record values for a single domain?―Yes.
    • What is the difference between Simple Routing Policy and Multi-Value Policy?―Multi-Value has health checks (Simple does not).
    • Multi-Value can return up to how many healthy records?―8.
    • If I want to distribute or "load balance" requests to my EC2 instances using Route 53, what Policy should I use?―Weighted Routing Policy.
    • What Routing Policy should I use to ensure my users connect to the destination with the fastest response time?―Latency Based Routing.
    • Geolocation Policy must have this configured for all records, in case there is "no match" for location to route the user to?―Default A Record.
    • What Routing Policy should I use influence how much traffic is routed to a specific Region, based on ONE value?―Geoproximity (bias value)
  • Health Checks
    • What are the 3 kinds of health checks in Route53? ↓
      • Endpoint
      • Other health checks (called "Calculated Health Check")
      • CloudWatch (metric to alarm on)
    • What kind of failover happens when a health check for one endpoint fails?―A DNS Failover.
  • DNS Failover
    • What are the two DNS failover configurations? ↓
      • Active-active
      • Active-passive
    • In an Active-passive configuration, which endpoint does Route 53 return first?―Primary (if healthy).