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NEW QUESTION # 158
A company ' s CloudOps engineer deploys four new Amazon EC2 instances by using the standard Amazon Linux Amazon Machine Image (AMI). The company needs to be able to use AWS Systems Manager to manage the instances. The CloudOps engineer notices that the instances do not appear in the Systems Manager console.
What must the CloudOps engineer do to resolve this issue?
Answer: C
Explanation:
Standard Amazon Linux AMIs typically already include the Systems Manager Agent. If instances do not appear as managed nodes in Systems Manager, the most common missing requirement is the instance profile permissions that allow the SSM Agent to communicate with Systems Manager service endpoints. The AWS managed policy AmazonSSMManagedInstanceCore grants the required permissions for core Systems Manager functionality. Option A is unnecessary because the standard Amazon Linux AMI already includes SSM Agent in most supported versions. Option B is irrelevant; ACM certificates are not required for SSM Agent registration. Option C is also wrong because the ssm-user account is created and managed by Session Manager when needed; manually creating it does not register the instance. Therefore, attach an IAM instance profile with AmazonSSMManagedInstanceCore.
NEW QUESTION # 159
A company needs to deploy instances of an application and associated infrastructure to multiple AWS Regions. The company wants to use a single AWS CloudFormation template to achieve this goal. The company uses AWS Organizations and wants to administer and run this template from a central administration account. What should a CloudOps engineer do to meet these requirements?
Answer: D
Explanation:
AWS CloudFormation StackSets are designed specifically for deploying a single CloudFormation template across multiple AWS accounts and multiple AWS Regions. With service-managed permissions, StackSets integrate with AWS Organizations so the administrator does not need to manually create IAM roles in every target account. AWS documentation states that service- managed StackSets can deploy stacks to accounts managed by AWS Organizations in specific Regions and that CloudFormation creates the required IAM roles on your behalf. This directly satisfies central administration, multi-account deployment, and multi-Region deployment. Options A, B, and C add unnecessary complexity and do not provide native organization-wide lifecycle management. Nested stacks are useful for modular templates, not centralized deployment across many accounts and Regions. Therefore, StackSets with service-managed permissions is the correct CloudOps automation approach.
NEW QUESTION # 160
A global company runs a critical primary workload in the us-east-1 Region. The company wants to ensure business continuity with minimal downtime in case of a workload failure. The company wants to replicate the workload to a second AWS Region.
A CloudOps engineer needs a solution that achieves a recovery time objective (RTO) of less than 10 minutes and a zero recovery point objective (RPO) to meet service level agreements.
Which solution will meet these requirements?
Answer: C
Explanation:
According to the AWS Cloud Operations and Disaster Recovery documentation, the active-active multi- Region architecture provides the lowest possible RTO and RPO among all disaster recovery strategies. In this approach, workloads are deployed and actively running in multiple AWS Regions simultaneously. All data is continuously replicated in real time between Regions using fully managed replication services, ensuring zero data loss (zero RPO).
Because both Regions are active and capable of handling requests, failover between them is instantaneous, meeting the RTO of less than 10 minutes. Amazon Route 53 is used with weighted or latency-based routing policies and health checks to automatically route traffic away from an impaired Region to the healthy Region without manual intervention.
In contrast:
* Pilot Light Architecture maintains only a minimal copy of the environment in the secondary Region. It requires time to scale up infrastructure during a disaster, resulting in longer RTO and potential data loss (non-zero RPO).
* Warm Standby Architecture keeps partially running infrastructure in the secondary Region. Although faster than pilot light, it still requires scaling and synchronization, resulting in higher RTO and RPO compared to active-active.
* Backup and Restore (option D) relies on periodic backups and restores data when needed. This approach has the highest RTO and RPO, unsuitable for mission-critical workloads demanding high availability and zero data loss.
Therefore, based on AWS-recommended disaster recovery strategies outlined in the AWS Cloud Operations and Disaster Recovery Guide, the Active-Active Multi-Region architecture (Option C) is the only approach that guarantees RTO < 10 minutes and RPO = 0, achieving continuous availability and business continuity across Regions.
Reference: AWS Cloud Operations and Disaster Recovery Whitepaper - Section: Disaster Recovery Strategies - Multi-Site (Active-Active) Approach; AWS CloudOps Best Practices for Reliability and Business Continuity.
NEW QUESTION # 161
A SysOps administrator is configuring an Auto Scaling group of Amazon EC2 instances for an application. The average CPU utilization of the instances in the Auto Scaling group must remain at approximately 40% when the load on the application changes.
Which solution will meet this requirement in the MOST operationally efficient manner?
Answer: C
Explanation:
Target tracking scaling policies are designed to automatically maintain a specific metric at a desired target value with the least administrative effort. AWS CloudOps documentation states that target tracking works like a thermostat, continuously adjusting capacity to keep the selected metric close to the defined target.
By specifying a target value of 40% average CPU utilization, the Auto Scaling group automatically scales out or in based on real-time demand without requiring manual thresholds, multiple alarms, or predefined scaling steps. This approach is fully managed by AWS and is the most operationally efficient option.
NEW QUESTION # 162
A company moves workloads from public subnets to private subnets to improve security. During testing, the company discovers that servers in the private subnets cannot reach an external API. The VPC has a CIDR block of 10.0.0.0/16. The VPC contains two public subnets and two private subnets. The VPC has one internet gateway and has a NAT gateway in each of the private subnets.
The company must ensure that workloads that run in the private subnets can reach the external API.
Which solution will meet this requirement?
Answer: D
Explanation:
Instances in private subnets do not have direct routes to an internet gateway, so they cannot reach public internet endpoints unless the VPC provides a managed egress path. The standard AWS architecture for private-subnet outbound internet access is to use a NAT device (typically a NAT gateway) placed in a public subnet, with an Elastic IP address and a route from the private subnet to that NAT gateway for 0.0.0.0/0 traffic. The NAT gateway then forwards traffic to the internet through the VPC's internet gateway while preventing unsolicited inbound connections to the private instances.
The scenario states that the VPC has a NAT gateway in each private subnet. That placement prevents proper egress because a NAT gateway itself must be in a public subnet with a route to the internet gateway to function for internet-bound traffic. Without that, private instances will fail to reach external services such as a third-party API, exactly as observed.
Option C corrects the architecture by deploying NAT gateways in the public subnets with Elastic IPs and updating the private subnet route tables so that outbound internet traffic targets the NAT gateways. This enables private workloads to initiate outbound connections while remaining unreachable from the public internet directly, maintaining the intended security posture.
Option A is incorrect because an outbound-only internet gateway is designed for IPv6 egress, not IPv4 internet access. Option B misunderstands routing: API Gateway is an application-layer proxy service and is not a target for VPC route tables to provide generic internet access. Option D is not applicable because VPC interface endpoints provide private connectivity to supported AWS services via PrivateLink, not to arbitrary external public APIs.
Therefore, deploying NAT gateways in the public subnets and routing private subnet egress through them is the correct solution.
NEW QUESTION # 163
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