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AZ-900 · Question #251

Identify what purpose does the load balancer resource have.

The correct answer is B. Its distributes virtual machine traffic evenly across multiple instances. The primary purpose of an Azure Load Balancer is to distribute incoming network traffic evenly across multiple backend resources, such as virtual machines or virtual machine scale sets, to ensure high availability and improve application performance.

Submitted by luis.pe· Mar 5, 2026Describe Azure Architecture and Services

Question

Identify what purpose does the load balancer resource have.

Options

  • AIts uses URL-based routing to route web traffic across multiple instances
  • BIts distributes virtual machine traffic evenly across multiple instances
  • CIt delivers internet traffic to the datacenter that is geographically closest to the user.
  • DIts add or removes virtual machine instances as demand increases

How the community answered

(28 responses)
  • A
    4% (1)
  • B
    93% (26)
  • D
    4% (1)

Why each option

The primary purpose of an Azure Load Balancer is to distribute incoming network traffic evenly across multiple backend resources, such as virtual machines or virtual machine scale sets, to ensure high availability and improve application performance.

AIts uses URL-based routing to route web traffic across multiple instances

URL-based routing is a feature of Application Gateway (Layer 7 load balancer) or Front Door, not a basic Azure Load Balancer.

BIts distributes virtual machine traffic evenly across multiple instancesCorrect

An Azure Load Balancer operates at Layer 4 (TCP, UDP) of the OSI model and distributes traffic to healthy instances within a single Azure region. It uses a hash-based distribution mode by default, routing new connections to the backend pool instances.

CIt delivers internet traffic to the datacenter that is geographically closest to the user.

Delivering internet traffic to the geographically closest datacenter is the function of a global load balancer like Azure Front Door or Azure Traffic Manager, not a regional Azure Load Balancer.

DIts add or removes virtual machine instances as demand increases

Adding or removing virtual machine instances as demand increases is a function of auto-scaling, typically implemented with Virtual Machine Scale Sets, not the Load Balancer itself.

Concept tested: Purpose of Azure Load Balancer

Source: https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-overview

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