SOA-C02 Practice Test 40 — 15 Questions

Question 1

A SysOps administrator manages an Amazon RDS for MySQL instance that handles a critical web application. During peak traffic, the number of database connections exceeds 500 for more than 15 minutes, leading to connection timeouts. The administrator wants to automatically increase the DB instance size when the connection count remains high, and decrease it when the load drops, to balance performance and cost. Which combination of AWS services should be used to achieve this automation with the least operational overhead?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Set up an Amazon CloudWatch alarm on the DatabaseConnections metric that triggers an AWS Lambda function to modify the DB instance class via the RDS API.. It uses a CloudWatch alarm to monitor the DatabaseConnections metric, which triggers an AWS Lambda function that directly calls the RDS ModifyDBInstance API to change the instance class. This approach provides the least operational overhead by leveraging native AWS services without additional infrastructure, custom resources, or periodic polling, and it enables real-time, event-driven scaling based on the specified threshold.

Answer

Configure a CloudWatch alarm on DatabaseConnections that triggers an Amazon CloudWatch Events rule, which directly modifies the DB instance class using a CloudFormation custom resource.

Answer

Use an AWS Config rule to monitor DatabaseConnections and invoke an AWS Lambda function to scale the RDS instance when the threshold is breached.

Answer

Use an AWS Systems Manager Automation runbook to periodically check the DatabaseConnections metric and adjust the RDS instance class if needed.

Question 2

A company runs a read-heavy database workload on Amazon RDS for PostgreSQL with a primary instance and two read replicas. The SysOps administrator observes that the read replicas frequently experience high replica lag during peak hours, causing stale reads for the application. The administrator needs to reduce replica lag while optimizing costs. The workload is predictable, with spikes during business hours and low traffic at night. Which combination of actions should the administrator take?

Accepted Answer

Upgrade the instance class of the read replicas to a larger type with more CPU and memory to handle the increased WAL replay rate.. Upgrading the read replica instance class provides more CPU and memory, which directly increases the WAL replay rate. In RDS for PostgreSQL, replica lag is primarily caused by the replica's inability to apply WAL changes as fast as the primary generates them. A larger instance class alleviates this bottleneck without incurring the cost of upgrading the primary instance.

Answer

Convert the read replicas to Multi-AZ instances to improve the replication process and reduce lag.

Answer

Add additional read replicas to distribute the read load and reduce the lag on each individual replica.

Answer

Upgrade the primary DB instance to a larger class with increased IOPS to reduce the amount of data that needs to be replicated.

Question 3

An application stores its RDS PostgreSQL credentials in AWS Secrets Manager. The security policy requires credentials to be rotated every 30 days automatically. During rotation, the application must continue to serve traffic with zero downtime. The application retrieves credentials by calling GetSecretValue at the start of each database connection. What must be configured to satisfy all requirements?

Accepted Answer

Enable automatic rotation in Secrets Manager with a 30-day schedule; use the AWS-provided Lambda rotation function for RDS PostgreSQL; ensure the application calls GetSecretValue per connection rather than caching credentials. AWS Secrets Manager's automatic rotation, combined with the AWS-provided Lambda rotation function for RDS PostgreSQL, ensures credentials are rotated every 30 days without manual intervention. The application's practice of calling GetSecretValue at the start of each database connection guarantees it always retrieves the current secret, avoiding stale credentials and achieving zero downtime during rotation.

Answer

Rotate credentials manually every 30 days by updating the secret value in the console and restarting the application

Answer

Create an EventBridge scheduled rule every 30 days that triggers a Lambda to generate a new RDS password and update both the database and the secret

Answer

Store credentials in an environment variable on the application's EC2 instance and rotate by updating the environment variable and reloading the application

Question 4

A company requires that all users in an AWS account must authenticate with multi-factor authentication (MFA) before they can perform any actions on Amazon EC2 instances. The SysOps administrator needs to implement this requirement using IAM policies. Which IAM policy condition key should be used to enforce MFA?

Accepted Answer

aws:MultiFactorAuthPresent. The `aws:MultiFactorAuthPresent` condition key checks whether the user authenticated using a valid MFA device before making the API request. By setting this condition to `true` in an IAM policy, you can enforce that all actions on EC2 instances require MFA authentication, meeting the company's requirement.

Answer

aws:SourceIp

Answer

aws:RequestedRegion

Answer

iam:PassedToService

Question 5

Drag and drop the steps to create an Amazon CloudWatch alarm that sends an email notification when CPU utilization exceeds 90% into the correct order.

Accepted Answer

Set up an SNS topic, then create the alarm selecting the CPU utilization metric, then define the condition (CPU > 90%), then add the notification action with the SNS topic.. First set up the SNS topic, then create the alarm selecting the metric, define the condition, and finally add the notification action.

Answer

Create the alarm selecting the CPU utilization metric, then set up an SNS topic, then define the condition (CPU > 90%), then add the notification action with the SNS topic.

Answer

Set up an SNS topic, then add the notification action with the SNS topic, then create the alarm selecting the CPU utilization metric, then define the condition (CPU > 90%).

Answer

Create the alarm selecting the CPU utilization metric, then define the condition (CPU > 90%), then set up an SNS topic, then add the notification action with the SNS topic.

Question 6

A SysOps administrator needs to deploy a new version of a web application to Amazon EC2 instances using AWS Elastic Beanstalk. The administrator wants to deploy the new version with zero downtime and validate the new version before routing production traffic to it. Which deployment policy should be used?

Accepted Answer

Immutable. Immutable deployment is correct because it launches a completely new set of EC2 instances in a separate Auto Scaling group, deploys the new application version to them, and passes health checks before swapping the environment's CNAME record to point to the new instances. This ensures zero downtime and allows validation of the new version before any production traffic is routed to it, as the old instances remain untouched until the swap is complete.

Answer

All at once

Answer

Rolling

Answer

Traffic splitting

Question 7

A company's security policy requires that all Amazon S3 buckets must have server-side encryption with AWS Key Management Service (SSE-KMS) enabled. The SysOps administrator needs to automatically detect any existing or new S3 bucket that does not have SSE-KMS enabled and automatically apply the encryption configuration. The solution must use managed AWS services with minimal custom code. Which combination of AWS services should be used?

Accepted Answer

Use AWS Config with a custom rule backed by an AWS Lambda function that checks if the S3 bucket has default SSE-KMS encryption enabled, and auto-remediates by enabling SSE-KMS default encryption (e.g., calling the PutBucketEncryption API).. It uses AWS Config with a custom Lambda-backed rule to detect non-compliant S3 buckets (those missing SSE-KMS) and auto-remediate by calling the PutBucketEncryption API to enable default SSE-KMS encryption on the bucket. This satisfies the requirement for minimal custom code (only the Lambda function) and uses managed AWS services (AWS Config, Lambda, S3) to automatically detect and fix both existing and new buckets, ensuring that all S3 buckets have SSE-KMS enabled as per the security policy.

Answer

Enable default encryption on the AWS account's S3 buckets using an S3 account-level setting in the S3 console, which automatically applies SSE-KMS to all new buckets.

Answer

Create an AWS CloudTrail event that triggers an AWS Lambda function when a bucket is created, and the Lambda applies SSE-KMS encryption. Use AWS Config to periodically scan existing buckets and apply encryption.

Answer

Use AWS Identity and Access Management (IAM) with a Service Control Policy (SCP) that denies any S3 bucket creation without SSE-KMS enabled, and use AWS Config to detect and notify on non-compliance.

Question 8

A company has two Amazon VPCs: VPC-A (10.0.0.0/16) and VPC-B (10.1.0.0/16) in the same AWS Region. The SysOps administrator needs to enable private IP connectivity between the two VPCs without using the public internet. The solution must be simple, low-cost, and provide high throughput. Which AWS service should the administrator use?

Accepted Answer

VPC peering. VPC peering is the correct choice because it enables direct private IP connectivity between two VPCs using the AWS global network, without requiring internet gateways, VPNs, or physical connections. It is simple to set up (no additional hardware or software), low-cost (no per-hour charges, only data transfer costs), and provides high throughput (bandwidth is limited only by the instance types, not by the peering connection itself).

Answer

AWS Site-to-Site VPN

Answer

AWS Direct Connect

Answer

AWS Transit Gateway

Question 9

A company has a VPC with public and private subnets. The private subnets need outbound internet access to download software updates while preventing any inbound internet traffic. The SysOps administrator must minimize costs. Which solution should the administrator implement?

Accepted Answer

Launch a NAT instance in a public subnet with an Elastic IP and disable source/destination check, then update private subnet route tables. A NAT instance, when launched in a public subnet with an Elastic IP and source/destination check disabled, can route outbound traffic from private subnets to the internet while blocking unsolicited inbound connections. This solution minimizes costs compared to a NAT Gateway, as NAT instances use existing EC2 instance pricing and can be further reduced with spot instances or smaller instance types.

Answer

Create a NAT Gateway in a public subnet and update the private subnet route table to use it

Answer

Attach an Internet Gateway to the VPC and add a default route to the Internet Gateway in the private subnets

Answer

Use AWS Transit Gateway with a VPN connection to an on-premises data center for internet access

Question 10

An environment has 12 individual CloudWatch metric alarms covering CPU, memory, disk, and network. When one instance degrades, all 12 alarms fire simultaneously and send 12 separate notifications to the on-call engineer. The team wants a single notification per incident regardless of how many individual alarms trigger. What CloudWatch feature addresses this?

Accepted Answer

Create a composite alarm that enters ALARM state when any of the 12 child alarms is in ALARM state, and configure a single SNS action on the composite alarm only. A composite alarm in CloudWatch can aggregate multiple child alarms into a single parent alarm. When any of the 12 child alarms enters the ALARM state, the composite alarm transitions to ALARM and triggers a single SNS notification, thereby reducing alert noise to one notification per incident.

Answer

Increase the alarm evaluation period on all 12 alarms to 30 minutes so they fire less frequently

Answer

Use an SNS topic with a delivery policy that batches notifications sent within a 60-second window

Answer

Configure all 12 alarms to write to the same CloudWatch Events rule and suppress duplicate events with EventBridge deduplication

Question 11

A company uses Amazon S3 to serve large files to users. The files are accessed frequently for the first 30 days after upload, then access drops significantly. The SysOps administrator wants to minimize storage costs while ensuring low-latency access for frequently accessed files and automatic optimization for changing access patterns. Which S3 storage class configuration should be used?

Accepted Answer

Use S3 Intelligent-Tiering.. S3 Intelligent-Tiering is the correct choice because it automatically moves objects between three access tiers (frequent, infrequent, and archive instant) based on changing access patterns, without any lifecycle rules or performance impact. This meets the requirement for low-latency access for frequently accessed files and automatic optimization, while minimizing storage costs as access drops after 30 days.

Answer

Use S3 Standard for 30 days, then transition to S3 Glacier Deep Archive.

Answer

Use S3 Standard then transition to S3 Glacier Flexible Retrieval after 30 days.

Answer

Use S3 One Zone-IA for the first 30 days, then transition to S3 Standard-IA.

Question 12

A web application publishes a custom metric 'FailedLoginAttempts' to Amazon CloudWatch. The SysOps administrator needs to be notified via Amazon SNS when the number of failed login attempts exceeds 100 within a 5-minute period. Which AWS service or feature should be used to create this notification?

Accepted Answer

Amazon CloudWatch alarm. An Amazon CloudWatch alarm is the correct service because it monitors a specific CloudWatch metric (such as 'FailedLoginAttempts') and triggers an action (such as sending an SNS notification) when the metric crosses a defined threshold over a specified period. In this case, the alarm evaluates whether the sum of 'FailedLoginAttempts' exceeds 100 within a 5-minute period, and upon breaching, it publishes to the SNS topic to notify the SysOps administrator.

Answer

Amazon CloudWatch Logs metric filter

Answer

Amazon CloudWatch dashboard

Answer

AWS Config rule

Question 13

A company uses AWS Direct Connect to connect its on-premises network to AWS. The SysOps team notices that traffic from the on-premises network to a VPC is not using the Direct Connect connection but instead is going over the internet. The VPC has a virtual private gateway attached and the on-premises router is advertising a specific route. What is the most likely cause?

Accepted Answer

The BGP session between the on-premises router and the Direct Connect router is down.. The BGP session between the on-premises router and the Direct Connect router is down. When BGP is down, the on-premises router cannot exchange routes with the AWS side over Direct Connect. Even though the on-premises router may be advertising a specific route, without an active BGP session, that route is not received by the Direct Connect router, and the virtual private gateway does not propagate it into the VPC. As a result, traffic from the on-premises network to the VPC falls back to using the internet route instead of Direct Connect. Option B is incorrect because the VPC route table controls outbound traffic from the VPC, not inbound traffic from on-premises; a default route to an Internet Gateway would cause asymmetric routing for return traffic but would not prevent inbound traffic from using Direct Connect if the BGP session is active.

Answer

The on-premises network does not have a route to the VPC CIDR.

Answer

The VPC route table has a more specific route (e.g., 0.0.0.0/0) pointing to an Internet Gateway.

Answer

The virtual private gateway is not attached to the VPC.

Question 14

The monitoring team needs to collect per-process CPU and memory utilization for a specific Java process (named 'app.jar') running on EC2 Linux instances. Standard EC2 metrics show aggregate CPU but not per-process details. Which CloudWatch agent configuration section enables this?

Accepted Answer

Add a procstat section under metrics_collected in the CloudWatch agent config, specifying process_name = 'app.jar' to collect per-process CPU and memory. The CloudWatch agent's `procstat` plugin is specifically designed to collect per-process metrics such as CPU and memory utilization. By adding a `procstat` section under `metrics_collected` in the agent configuration file and specifying the process name (e.g., `process_name = 'app.jar'`), the agent will gather the required per-process metrics and send them to CloudWatch. This is the only native method within the CloudWatch ecosystem to achieve per-process monitoring on EC2 Linux instances.

Answer

Enable enhanced monitoring on the EC2 instance and select 'per-process metrics' from the console

Answer

Configure a CloudWatch Logs metric filter on the Java GC log output to derive CPU and memory figures

Answer

Use the aws ec2 describe-instance-status API on a schedule to pull process metrics from the instance's system status checks

Question 15

A company runs a web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application stores session state in memory on each instance. The SysOps administrator wants to make the application highly available across multiple Availability Zones without losing session data when instances are terminated or replaced. The solution must minimize application changes. Which approach should the administrator take?

Accepted Answer

Store session data in a shared Amazon ElastiCache cluster and modify the application to read/write session state to ElastiCache.. Storing session state in a shared Amazon ElastiCache cluster decouples session data from individual EC2 instances, allowing any instance in the Auto Scaling group to serve any user request without losing session data when instances are terminated or replaced. This approach requires minimal application changes (only modifying the session handler to point to ElastiCache) and supports high availability across multiple Availability Zones by using a replicated ElastiCache cluster (e.g., Redis with replication).

Answer

Use sticky sessions (session affinity) on the ALB and configure the Auto Scaling group with a larger min size.

Answer

Deploy the application in multiple AWS Regions and use Amazon Route 53 with latency-based routing.

Answer

Store session data in an Amazon RDS for MySQL database and configure the application to read/write session state to the database.