Community Q&A

SAP-C02 — frequently asked questions

Community-vetted answers to 16 common questions about this exam, each traced back to a specific practice question.

Questions from real practice questions

Each Q&A comes from a specific question — follow the link for the full analysis

Improving Application Reliability with Auto Scaling and Aurora

Why is adding a second VPC peering connection (B) wrong for reliability?

VPC peering is not a high-availability mechanism. It connects two VPCs but does not provide redundancy against AZ failures or instance crashes within those VPCs.

Can I move an existing EC2 instance to another VPC easily?

No. You cannot directly move a running EC2 instance to a different VPC. You must create a new instance in the target VPC from a snapshot or AMI, which disrupts service.

How Should a Company Design High-Performance Hybrid DNS for cloud.example.com?

Why is a Route 53 outbound resolver wrong for on-premises queries?

An outbound Resolver endpoint forwards DNS queries from VPCs to on-premises resolvers; on-premises systems need an inbound endpoint to query Route 53 private hosted zones.

Does associating the private hosted zone with every VPC reduce performance?

No. Local association lets each VPC answer cloud.example.com directly, avoiding hairpins through the shared services VPC and improving resolution performance.

How to Let a New Account Update AWS Config Under Root SCPs?

Why can’t an allow SCP on a temporary Onboarding OU override the root deny-list SCP?

SCPs are filters, not grants; an explicit deny at the organization root still applies to every child OU and account, so a lower-level allow cannot take effect while the root deny remains.

Why move the root SCP to the Production OU instead of deleting it?

Moving it keeps the same deny-list protections for Production accounts while freeing the new account in Onboarding to update AWS Config; deleting it would remove enforcement for everyone.

How to Share VPC Subnets Across AWS Accounts with RAM?

Why is a transit gateway (A) not needed for sharing subnets across accounts?

A TGW routes traffic between VPCs but does not grant accounts permission to launch resources in another account's subnets; the requirement is delegated subnet use via AWS RAM.

Why must resource sharing be enabled in the Organizations management account?

AWS RAM sharing with an OU requires resource sharing enabled at the organization level; without it, the infrastructure account's resource share cannot target the OU.

Which S3 storage solution archives private documents at the lowest cost?

Why is S3 Glacier Deep Archive not the lowest-cost answer here?

Its per-GB storage is cheaper, but restoring archived objects takes hours and adds retrieval/request costs; without a restore workflow the intranet cannot serve them directly.

Why does S3 One Zone-IA fit data copied from physical media?

Because the archive is a secondary copy, losing one Availability Zone does not lose the only copy, and One Zone-IA costs less than Standard-IA.

How Do You Detect Unsolicited Inbound Traffic in NAT Gateway Flow Logs?

Why is CloudTrail wrong for analyzing NAT gateway flow logs?

VPC Flow Logs are delivered to CloudWatch Logs (or S3/Firehose), not CloudTrail, which records AWS API activity rather than packet flows.

Why query dstAddr like 198.51.100.2 instead of the inbound record already seen?

The visible inbound record only shows the public IP sending traffic; the reverse flow with dstAddr 198.51.100.2 and srcAddr 203.0 shows whether the EC2 instance initiated the connection first.

How to Replicate Aurora MySQL Cross-Region for DR at Lowest Cost?

Why is DMS CDC to S3 not a valid Aurora DR solution here?

DMS writes change data as CSV or Parquet in S3, not a restorable Aurora cluster. Restoring would require ETL and reload, so it does not meet the database DR requirement.

Can Aurora automated backups be disabled to use hourly cross-Region backups?

Aurora automated backups cannot be disabled; retention is managed at the DB cluster level. That makes option D not implementable as written.

How to Collect Migration Evaluator Assessment and VM Dependencies with Least Overhead?

Why can't AWS Migration Hub alone generate the Quick Insights report?

Quick Insights is produced by Migration Evaluator; Migration Hub visualizes ADS discovery data but does not replace the Migration Evaluator Collector or its assessment workflow.

Is agentless Application Discovery enough for VM dependency mapping?

Agentless collection is useful for inventory, but application dependency visualization often needs agent-based inbound/outbound network connection data, especially when the scenario permits installing agents on every VM.