SOA-C03 practice question: CloudFront and Global Accelerator (2 of 2)

Networking and Content Delivery A free question from our original SOA-C03 practice exam. Try it, then open the answer to see why each option is right or wrong.

An esports league hosts real-time match servers that use UDP in us-west-2 and eu-central-1 behind Network Load Balancers. Players around the world connect through a game client that can store only two fixed IP addresses. The league wants players to enter the AWS network near them for lower jitter, and traffic to move to the other Region within seconds if one Region's servers become unhealthy. What should a CloudOps engineer use?

Choose one answer.

A. An Amazon CloudFront distribution with both Network Load Balancers in an origin group.
B. An AWS Global Accelerator accelerator with an endpoint group for each Region that contains that Region's Network Load Balancer.
C. Route 53 latency-based records for the two load balancers, with health checks on each record.
D. Elastic IP addresses on each Network Load Balancer, with the client switching to the other Region when it detects a failure.

Show the answer and explanation

Answer: B

A. Wrong: CloudFront serves HTTP and HTTPS, including WebSocket, but it does not carry arbitrary UDP game traffic. Origin groups also fail over per request for HTTP responses only. Learn more: What is Amazon CloudFront? (opens in a new tab)
B. Right: Correct. Global Accelerator gives two static anycast IP addresses that players enter at the nearest edge location, and it supports UDP. Its health checks move traffic to the healthy endpoint group quickly, without DNS changes. Learn more: What is AWS Global Accelerator? (opens in a new tab)
C. Wrong: Latency records give DNS names, not fixed IP addresses for the client. Failover also depends on DNS caching, which can take longer than seconds. Learn more: Latency-based routing (opens in a new tab)
D. Wrong: The client can store only two addresses, and each Regional load balancer has its own addresses per Availability Zone. Failover would also rely on client logic rather than the network. Learn more: What is a Network Load Balancer? (opens in a new tab)

Explanation

Global Accelerator suits non-HTTP traffic such as UDP games that needs fixed IP addresses and fast Regional failover. Its two static anycast addresses bring players onto the AWS network close to them, and health-based routing shifts traffic between endpoint groups without waiting for DNS caches. CloudFront is for HTTP content, and DNS-based approaches cannot give fixed addresses.

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What is AWS Global Accelerator?

SOA-C03 practice question: CloudFront and Global Accelerator (2 of 2)

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