A company wants to receive a globally accessed TCP-based application on fixed static IP addresses and route it through the AWS global network to the nearest healthy Region to improve availability and performance. Which service is BEST suited?

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Select an answer
CorrectC

Explanation

Question Overview

Selecting a service that routes a TCP application globally with high speed and availability.

Requirements to satisfy
  • 1「TCP-based application」It must support forwarding TCP/UDP traffic, not HTTP cache delivery
  • 2「fixed static IP addresses」It must provide static anycast IP addresses as the entry point
  • 3「nearest healthy Region」It must direct globally to a healthy endpoint based on health checks
Per-option explanation
AIncorrect

Amazon CloudFront

Amazon CloudFront is a CDN that caches HTTP/HTTPS content at the edge and delivers it.

What it excels at is speeding up the delivery of web content, and the requirement to receive TCP/UDP traffic on static IP addresses and optimize the path end to end is handled by Global Accelerator, so it is incorrect.

BIncorrect

Amazon Route 53

Amazon Route 53 is a DNS service and can do things such as latency-based routing.

However, after DNS returns a result, the communication path is left to the internet, and it does not provide fixed static IP addresses. Putting the path itself on the AWS network to speed it up is the role of Global Accelerator, so it is incorrect.

CCorrect

AWS Global Accelerator

Correct. AWS Global Accelerator is a service that makes access from around the world fast and stable.

There are three key points. (1) The entry point provides two unchanging static IP addresses. (2) Traffic enters the AWS dedicated network from the nearest location and reaches the destination without passing through the congestion-prone internet (which is why it is fast). (3) A Region experiencing a failure is automatically avoided, and traffic is directed to a healthy Region.

It works not only for HTTP but also for TCP/UDP applications.

DIncorrect

Elastic Load Balancing (ELB)

Elastic Load Balancing is a service that distributes traffic across multiple targets within a single Region.

It cannot handle global routing that spans multiple Regions, so it is incorrect. In practice it is used as a backend endpoint behind Global Accelerator.

Key Takeaway

'Static IP addresses', 'TCP/UDP', and 'to the nearest healthy endpoint' point to AWS Global Accelerator. For cache delivery of HTTP content, use CloudFront. Distinguish by how they work: GA = path optimization (no caching) / CloudFront = cache delivery. ELB is within a Region, and Route 53 is DNS.

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