Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 410 discussion

An application load balancer exposes a hostname a not an IP address. An A record uses an IP address. cname maps hostname to hostname. I go with D.

A is the answer. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routing-policy-latency

Geoproximity routing policy – Use when you want to route traffic based on the location of your resources and, optionally, shift traffic from resources in one location to resources in another.

I think the answer should be A: For example, suppose you have ELB load balancers in the US West (Oregon) Region and in the Asia Pacific (Singapore) Region. You created a latency record for each load balancer. Here's what happens when a user in London enters the name of your domain in a browser: DNS routes the query to a Route 53 name server. Route 53 refers to its data on latency between London and the Singapore region and between London and the Oregon region. If latency is lower between the London and Oregon regions, Route 53 responds to the query with the IP address for the Oregon load balancer. If latency is lower between London and the Singapore region, Route 53 responds with the IP address for the Singapore load balancer. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy-latency.html

Latency routing policy – Use when you have resources in multiple AWS Regions and you want to route traffic to the region that provides the best latency. You can use latency routing to create records in a private hosted zone. Geolocation routing policy – Use when you want to route traffic based on the location of your users. You can use geolocation routing to create records in a private hosted zone. Failover routing policy – Use when you want to configure active-passive failover. You can use failover routing to create records in a private hosted zone. Geoproximity routing policy – Use when you want to route traffic based on the location of your resources and, optionally, shift traffic from resources in one location to resources in another.

I'm going with A. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-to-elb-load-balancer.html https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html

First rule out B & C For A: To use latency-based routing, you create latency records for your resources in multiple AWS Regions. When Route 53 receives a DNS query for your domain or subdomain (example.com or acme.example.com), it determines which AWS Regions you've created latency records for, determines which region gives the user the lowest latency, and then selects a latency record for that region. A is better.

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What is difference between geolocation and Geoproximity routing? You can use geolocation routing to create records in a private hosted zone. Geoproximity routing policy – Use when you want to route traffic based on the location of your resources and, optionally, shift traffic from resources in one location to resources in another.

A is correct since the question is asking highest possible performance -> latency policy.

A think it's "A" "Route 53 supports latency-based routing for A, AAAA, TXT, and CNAME records, as well as aliases to A and AAAA records." https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/TutorialTransitionToLBR.html

I see following sentence "If your application is hosted in multiple AWS Regions, you can improve performance for your users by serving their requests from the AWS Region that provides the lowest latency." link - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html So "A"

Answer is A. Refer url: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-values-latency.html A — IPv4 address An IP address in IPv4 format, for example, 192.0.2.235. CNAME — Canonical name The fully qualified domain name (for example, www.example.com) that you want Route 53 to return in response to DNS queries for this record.

Answer is A. Refer url which revealed IP address is supported by ALB. https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-listeners.html#host-conditions

A https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routing-policy-latency

Latency routing policy – Use when you have resources in multiple AWS Regions and you want to route traffic to the Region that provides the best latency with less round-trip time. Answer should be A

Answer is D. Since ALB exposes a name (and not an IP) we need a CNAME, so this rules out A&B. Between failover and geoproximity, the second can do the trick. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routing-policy-geoproximity