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AWS Wavelength

AWS Wavelength embeds AWS compute and storage services directly inside Telecommunications Providers’ (Telco) data centers—at the edge of the 5G network.

  • The Problem it Solves: Normally, mobile traffic has to travel from the device Cell Tower Telco Core Network Internet AWS Region. This introduces latency (lag).
  • The Wavelength Solution: Traffic goes from Device Cell Tower Wavelength Zone (AWS servers inside the Telco facility). It skips the public internet hop entirely for the lowest possible latency to mobile devices.

- 2. Key Architecture Concepts for the Exam

- Wavelength Zones

  • Similar to an Availability Zone (AZ) but located inside a carrier's 5G network (e.g., Verizon in the US, Vodafone in Europe).
  • VPC Extension: You extend your existing VPC to a Wavelength Zone. You create a subnet in the Wavelength Zone, just like you would in a regular AZ.

- Carrier Gateway

  • Critical Exam Keyword: Just as an Internet Gateway connects a VPC to the Internet, a Carrier Gateway allows resources in the Wavelength subnet to communicate with the carrier's mobile network and the internet.
  • Function: It performs NAT (Network Address Translation) to assign carrier IP addresses to your EC2 instances so mobile devices can reach them directly.

- 3. Common Exam Scenarios (Use Cases)

If a question describes one of these scenarios, look for AWS Wavelength in the answers:

Scenario Keywords to Watch For
Smart Cities / IoT "Connected vehicles," "Traffic analysis," "5G IoT sensors."
Real-time Gaming "Game streaming to mobile devices," "Minimize jitter for mobile players."
AR / VR "Augmented Reality rendering," "Virtual Reality for field workers," "Low latency rendering."
Machine Learning Inference "Real-time inference at the edge," "Medical image analysis on mobile tablets."

- 4. "Edge" Service Comparison: The Exam Trap

The exam often asks you to choose between Outposts, Local Zones, and Wavelength. Use this cheat sheet to distinguish them:

  • Choose AWS Wavelength if:
  • The users are on Mobile / 5G devices.
  • You need ultra-low latency specifically for mobile networks.

  • You do not own the data center (it's the Telco's facility).

  • Choose AWS Local Zones if:

  • The users are generic internet users (corporate offices, home gamers, content creators) in a specific city (e.g., Los Angeles, Houston).

  • You need single-digit millisecond latency to a specific geographic metro area, regardless of whether they are on 5G, Wi-Fi, or wired fiber.

  • Choose AWS Outposts if:

  • The workload must run on-premises (in your own physical building/data center).
  • Keywords: "Data residency requirements," "Run in client's own facility," "Hybrid cloud with local processing."