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High Availability Flashcards

7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 High Availability flashcards as text

  1. A company uses AWS Systems Manager Run Command to patch EC2 instances. How should the DevOps team structure patching to maintain high availability?

    Answer: Use Patch Manager with maintenance window rate controls to patch a percentage of instances at a time

    Patch Manager's rate controls allow patching a defined percentage or count of targets concurrently, maintaining service capacity during patching.

  2. An application running on EC2 uses an Elastic IP address for high availability. What is a significant limitation of this approach compared to using a load balancer?

    Answer: Failover requires re-associating the Elastic IP, causing brief downtime and requiring automation

    Elastic IP failover requires disassociation from the failed instance and association to a replacement, introducing downtime and complexity compared to load balancer health-check-based routing.

  3. Which AWS service provides a fully managed, highly available message broker that supports industry-standard protocols like AMQP and MQTT for migrating on-premises messaging?

    Answer: Amazon MQ

    Amazon MQ is a managed Apache ActiveMQ and RabbitMQ service that supports AMQP, MQTT, and other standard protocols, easing migration from on-premises brokers.

  4. A DevOps team is designing a pipeline to deploy a containerized microservice. Which approach best supports zero-downtime deployments in Amazon EKS?

    Answer: Use Kubernetes rolling update strategy with maxUnavailable=0 and maxSurge=1

    Setting maxUnavailable=0 ensures no pods are terminated before replacement pods are ready, and maxSurge=1 allows one extra pod during the rollout.

  5. AWS CloudWatch composite alarms can improve high-availability alerting. What is the primary advantage over individual alarms?

    Answer: They reduce alarm noise by only alerting when multiple conditions are simultaneously true, indicating a real issue

    Composite alarms combine multiple alarms with AND/OR logic, reducing false positives by alerting only when a combination of conditions indicates a genuine incident.

  6. A company needs its API Gateway to remain available even during a regional AWS outage. Which architecture achieves this?

    Answer: Deploy identical APIs in multiple regions with Route 53 health-check-based failover routing

    Deploying API Gateway endpoints in multiple regions with Route 53 health checks provides automatic DNS-based failover if an entire region becomes unavailable.

  7. What does the RPO (Recovery Point Objective) measure in a high-availability and disaster recovery strategy?

    Answer: The maximum acceptable amount of data loss measured in time from the last backup to the failure

    RPO defines the maximum tolerable data loss, expressed as the time window between the last recovery point and the failure event.