A company has deployed the same web application into two Regions and owns the domain example.com. Visitors should be sent to whichever Regional deployment answers them fastest, and away from one that has stopped responding. Which TWO components deliver that?
AWS Certified Cloud Practitioner (CLF-C02), objective 3. Cloud technology and services medium
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The options
Choose 2.
Correct Amazon Route 53 with a latency-based routing policy and health checks on each Regional endpoint
Correct. Route 53 is the authoritative DNS service, and the routing policy plus health checks are what decide which Region's address a given visitor is given, and what stops handing out an address that is failing its check.
Correct An Elastic Load Balancer in each Region distributing requests across that Region's instances
Correct. DNS gets the visitor to a Region; something inside the Region still has to spread the requests across healthy instances and Availability Zones, and that is the load balancer's job.
Not correct VPC peering between the two Regions
Wrong for this purpose. Peering lets resources in the two VPCs address each other privately. It plays no part in deciding where a visitor's request goes.
Not correct A NAT gateway in each public subnet
Wrong. A NAT gateway is for outbound connections from private subnets. Inbound visitor traffic never passes through one.
Not correct An S3 bucket configured for static website hosting
Wrong. That is a way to serve a static site cheaply; it neither answers DNS queries for the domain nor balances traffic across Regions.
Why
Keep the two layers separate in your head. Route 53 answers the question 'which address does this name resolve to', and its routing policies — simple, weighted, latency-based, failover, geolocation, geoproximity, multivalue — are how you express a global answer. Elastic Load Balancing answers 'which of my healthy servers gets this request' inside one Region. Route 53 also registers domains and runs the health checks that make failover automatic.
Where this comes from
- Cited
- AWS exam guide task statement 3.5
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