Final Quizizz

A company runs a 3-tier web application in private subnets and needs to allow EC2 instances to download updates. What should they do?

• Assign Elastic IPs
• Use IGW
• Use NAT Gateway in public subnet and route from private
• Use VPC peering

Answer explanation

A NAT Gateway in a public subnet allows outbound internet access from private subnets.

How can a company preserve EC2 in-memory data during a 2-week shutdown?

• Snapshot and restore
• Use hibernation-enabled EC2
• Reattach EBS
• Stop/start normally

Answer explanation

Hibernation stores instance RAM to disk and resumes with memory intact.

How to allow fast failover between EC2 instances using the same private IP?

• Elastic IP reassignment
• Use DHCP option set
• Move Elastic Network Interface
• Private hosted zone update

Answer explanation

Elastic Network Interfaces can be detached and reattached across instances.

How to enable JavaScript in browsers to fetch objects from your S3 bucket?

• Enable signed URLs
• Enable CORS
• Use CloudFront
• Enable S3 Logging

Answer explanation

Cross-Origin Resource Sharing (CORS) allows scripts to make cross-domain requests.

What encryption methods meet the requirement for customer-managed key storage on-premises?

• SSE-S3 and SSE-KMS
• SSE-C and client-side encryption
• KMS with key rotation
• CloudHSM

Answer explanation

SSE-C and client-side encryption allow customers to use and manage their own keys.

What's the most cost-effective way to handle EC2 batch processing that exceeds reserved instance hours?

• More reserved instances
• Use Spot Instances
• Switch to On-Demand
• Auto Scaling

Answer explanation

Spot Instances offer significant savings for batch, fault-tolerant workloads.

Which EC2 feature improves network performance for latency-sensitive applications?

• Enhanced networking
• Auto Recovery
• Dedicated Hosts
• Nitro Enclaves

Answer explanation

Enhanced networking provides higher IOPS and lower latency.

Which S3 storage class is suitable for infrequent access with sub-minute retrieval?

• S3 Standard
• S3 IA
• S3 Glacier Deep Archive
• S3 Glacier Instant Retrieval

Answer explanation

S3 Glacier Instant Retrieval offers low-cost storage with milliseconds access time.

Which AWS service is used to distribute static web assets globally with caching?

• Global Accelerator
• Route 53
• CloudFront
• Lambda@Edge

Answer explanation

Amazon CloudFront provides content delivery network (CDN) services.

Which service provides metrics and alarms for AWS resources?

• CloudTrail
• CloudWatch
• AWS Config
• SNS

Answer explanation

CloudWatch monitors resources and triggers alarms when thresholds are breached.