200-901 Question #196: Real Exam Question with Answer & Explanation

Question

How are load balancers used in modern application deployments?

Options

• ATurn off traffic and take down compute units, then update and bring the compute units back up.
• BAllow traffic to continue as new compute units are brought up and old compute units are taken
• CAllow http and https traffic to continue as old compute units are discontinued before new units are
• DBring up new compute units, test the compute units, and switch the traffic from old units to new

Explanation

Load balancers enable modern application deployments to achieve high availability and zero-downtime updates by intelligently distributing incoming traffic across healthy compute units, allowing for seamless scaling and updates.

Common mistakes.

• A. Turning off traffic and taking down compute units for updates represents a downtime-prone deployment strategy, which load balancers are specifically designed to avoid.
• C. This option describes a scenario where old units are discontinued before new ones are fully available, which would cause downtime or service degradation, precisely what load balancers prevent.
• D. While load balancers facilitate bringing up new units and switching traffic, option B better encompasses the continuous nature ("allow traffic to continue") and the full lifecycle of updating and replacing old units, which is the primary benefit of using a load balancer in such a scenario.

Concept tested. Load balancer benefits in deployment strategies

Reference. https://learn.microsoft.com/en-us/azure/architecture/guide/design-principles/scale-out#load-balancing

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