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Question

Difficulty: EasyApplication Load Balancing and Delivery

A company has a regional TCP-based application deployed on Azure Virtual Machines in a single region. The virtual machines use Standard SKU public IP addresses. The solution must distribute TCP traffic at the transport layer and support the existing Standard SKU resources without configuration validation errors. Which load balancing service should you recommend?

  1. A
    Azure Basic Load Balancer
  2. Azure Standard Load BalancerAnswer
  3. C
    Azure Traffic Manager
  4. D
    Azure Front Door

Answer

Azure Standard Load Balancer
Azure Standard Load Balancer operates at Layer 4 (TCP/UDP) and supports backend resources configured with Standard SKU public IP addresses. Since the application requires regional TCP load balancing and the virtual machines have Standard SKU public IPs, the Standard Load Balancer is the correct choice and avoids SKU validation errors.

Step-by-Step Solution

1
Identify the protocol and routing requirements.
The application requires regional load balancing for TCP (Layer 4) traffic without HTTP-specific features.
This rules out HTTP/HTTPS application-layer load balancers like Azure Front Door.
2
Check the SKU requirements of the backend resources.
The backend virtual machines are configured with Standard SKU public IP addresses.
To prevent SKU mismatch validation errors, the load balancer SKU must match the backend public IP resource SKU (both must be Standard).
3
Select the load balancer that matches both layer and SKU constraints.
Azure Standard Load Balancer operates at Layer 4 and is compatible with Standard SKU backend resources.
This satisfies all constraints without validation failures.

Key Concept

Azure Load Balancer SKU matching and protocol constraints
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Topics

Application Load Balancing and Delivery

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