Get Your CertCLF-C02PlayCompete
‹ All CLF-C02 questions

CLF-C02 Practice Question 7: Availability Zones

AWS Certified Cloud Practitioner (CLF-C02) · Test 1 · question 7 of 10

Cloud Technology & Serviceseasy

An application currently runs on several EC2 instances that all sit in a single Availability Zone. The business needs the application to stay available if that entire Availability Zone becomes unavailable, while keeping the change as simple as possible. What should be done?

Select one answer
Show answer and explanation

Answer:

  • D. Run instances in at least two Availability Zones in the Region behind a load balancer

An AWS Region contains multiple Availability Zones, physically separate groups of data centers with independent power, cooling, and networking, connected by low-latency links. Spreading instances across two or more Availability Zones behind an Elastic Load Balancer is the standard way to survive the loss of a single zone, and it is the smallest change here.

Option A adds capacity to instances that still share one zone's fate. Option B is the classic trap: a second subnet does not help if it lives in the same Availability Zone, because subnets never span zones. Option C improves latency and caching for viewers and can absorb some load, but CloudFront edge locations still fetch dynamic content from the origin; if the origin's only Availability Zone fails, the application is still down.

Reference: Regions and Availability Zones

Practice Test 1 ›

Study guides for CLF-C02

AWS interview questions: scenarios, freshers to experiencedAWS interview questions on EC2, Lambda, S3, databases, VPC and IAM, by level, with four scenarios worked end to end and the facts old answers get wrong.
Free cloud certifications in 2026: which are really freeWhich free cloud certifications are really free in 2026: Oracle's free OCI exams, and the voucher routes for AWS, Microsoft and Google, with prices.
SAA-C03 exam guide: what's on it and how to passSAA-C03 exam guide for 2026: the four domains, 65 questions in 130 minutes, price in USD and INR, the October 2026 guide update and a study plan.
Business Automation Examples: McDonald's to Step FunctionsBusiness automation examples from McDonald's, KFC, Ford and Toyota, the four moves they share, what to automate first, and AWS Step Functions.
How AWS Certification Exams Work: Scoring and RenewalHow AWS certification exams work: levels, booking, question types, unscored questions, scaled scores, pass marks, validity and how recertification works.
What Is Amazon RDS? Multi-AZ, Read Replicas and BackupsWhat is Amazon RDS? Engines, Multi-AZ, read replicas, backups, RDS Proxy, Aurora and pricing explained, with the traps that AWS exams set around each one.
AWS Cloud Practitioner exam (CLF-C02) and how to pass itAWS Cloud Practitioner exam (CLF-C02): 65 questions, a 700 pass mark, four domains, exam price, and a free plan to prepare.
What Is AWS Lambda? Triggers, Concurrency and Cold StartsWhat is AWS Lambda? How functions run, cold starts, triggers vs event source mappings, concurrency, layers, aliases, pricing and the exam traps.
What jobs can you get with AWS Cloud Practitioner?What jobs can you get with AWS Cloud Practitioner (CLF-C02)? The roles it helps with, the ones it won't land on its own, and what to add next.
Which cloud certification is best? AWS vs Azure vs GoogleWhich cloud certification is best for a beginner? AWS Cloud Practitioner, AZ-900 and Google Cloud Digital Leader compared: cost, format and which first.
AWS certification cost in 2026, and free ways to prepareWhat every AWS certification costs in 2026 in USD and INR, retake and reschedule rules, the 50% voucher, and the free official ways to prepare.
Which AWS certification should you get? 2026 roadmapWhich AWS certification to get first, by role and experience, with each exam's status in October 2026, what is changing, and prices in USD and INR.
What Is AWS Glue? Data Catalog, Crawlers and ETL JobsWhat is AWS Glue? The Data Catalog, crawlers, ETL jobs and DPUs, workflows, streaming, job bookmarks, Flex and Data Quality, plus the traps AWS exams set.
AWS Edge Locations and CloudFront, ExplainedHow AWS edge locations work: CloudFront POPs, regional edge caches, the request path, edge location vs Region, and the Global Accelerator exam trap.
What Is Amazon EC2? Instances, AMIs, EBS and Auto ScalingAmazon EC2 explained: instances, AMIs, instance types, security groups, EBS, Auto Scaling groups and pricing options, with the traps AWS exams set.
Amazon S3 storage classes and lifecycle rulesHow S3 storage classes, Intelligent-Tiering and lifecycle rules work, with the retrieval fees and minimum durations that AWS exam questions turn on.
IAM users, roles and policies on AWSHow IAM users, roles, identity-based and resource-based policies, cross-account access, SCPs and permissions boundaries fit together for AWS exams.
The AWS shared responsibility model explainedWhat AWS secures and what you secure on EC2, RDS, Lambda and S3, how the line moves with each service, and how Cloud Practitioner questions test it.