Free AWS DOP-C02 Actual Exam Questions - Question 7 Discussion
Balancer (ALB) The EC2 Instances are in multiple Availability Zones The application was
misconfigured in a single Availability Zone, which caused a partial outage of the application.
A DevOps engineer made changes to ensure that the unhealthy EC2 instances in one Availability
Zone do not affect the healthy EC2 instances in the other Availability Zones. The DevOps engineer
needs to test the application's failover and shift where the ALB sends traffic During failover. the ALB
must avoid sending traffic to the Availability Zone where the failure has occurred.
Which solution will meet these requirements?
I think D fits best here. Using the readiness check with the ELB target group ARN gives a more targeted way to control traffic to specific AZs, which seems safer than just turning off cross-zone load balancing. It ensures that only healthy targets get traffic during failover, which is what they want.
B/C? B feels right since cross-zone is set on the target group, and ARC can shift traffic away from the bad AZ. But C could work if ARC handles ALB DNS-level failover cleanly.
D imo, because using the readiness check with the ELB target group ARN gives more precise control over which AZs get traffic, making failover safer than just toggling cross-zone load balancing.
B/D? B makes sense since cross-zone load balancing is on the target group, not ALB. But D’s readiness check could add extra validation to avoid sending traffic to bad zones.
B vs D—B fits better since cross-zone balancing is target group config, not ALB-wide.
It’s B because cross-zone load balancing is controlled per target group, not the ALB itself.
B, since cross-zone load balancing applies to target groups, not the ALB itself.
B/C? I’m ruling out A because turning off cross-zone load balancing on the ALB itself doesn’t seem right—it’s usually managed at the target group level. Between B and C, B mentions turning off cross-zone load balancing specifically on the target group, which aligns better with how ALB routing works. Also, using Application Recovery Controller to shift traffic away from a failing zone fits the failover testing requirement. C seems off since it talks about a resource set with the ALB’s DNS hostname, which might not directly control traffic shift like targeting the ARN in B or D would.
Does the question specify which version of the ALB or Route 53 features are available?