Developing Applications and Automating Workflows Using Cisco Platforms (DEVASC) — Question 109

How are load balancers used in modern application deployments?

Answer options

• A. Turn off traffic and take down compute units, then update and bring the compute units back up.
• B. Allow traffic to continue as new compute units are brought up and old compute units are taken down.
• C. Allow HTTP and HTTPS traffic to continue as old compute units are discontinued before new units are brought up.
• D. Bring up new compute units, test the compute units, and switch the traffic from old units to new units.

Correct answer: B

Explanation

The correct answer, B, highlights the load balancer's role in maintaining service availability by allowing traffic to flow seamlessly during the introduction of new compute units and the decommissioning of old ones. Option A is incorrect as it suggests shutting down traffic, which would lead to downtime. Option C incorrectly specifies only HTTP and HTTPS traffic without mentioning the overall traffic management, while option D implies testing new units before switching traffic, which is not the primary function of a load balancer.