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NEW QUESTION # 115
A CloudOps engineer has created a VPC that contains a public subnet and a private subnet. Amazon EC2 instances that were launched in the private subnet cannot access the internet. The default network ACL is active on all subnets in the VPC, and all security groups allow outbound traffic.
Which solution will provide the EC2 instances in the private subnet with access to the internet?
Answer: A
Explanation:
According to the AWS Cloud Operations and Networking documentation, instances in a private subnet do not have a direct route to the internet gateway and thus require a NAT gateway for outbound internet access.
The correct configuration is to create a NAT gateway in the public subnet, associate an Elastic IP address, and then update the private subnet's route table to send all 0.0.0.0/0 traffic to the NAT gateway. This enables instances in the private subnet to initiate outbound connections while keeping inbound traffic blocked for security.
Placing the NAT gateway inside the private subnet (Options C or D) prevents connectivity because it would not have a route to the internet gateway. Configuring routes from the public subnet to the NAT gateway (Option B) does not serve private subnet traffic.
Hence, Option A follows AWS best practices for enabling secure, managed, outbound-only internet access from private resources.
Reference: AWS Cloud Operations & Networking Guide - Section: Providing Internet Access to Private Subnets Using NAT Gateway
NEW QUESTION # 116
A company runs a high performance computing (HPC) data-processing application on Amazon EC2 instances in one Availability Zone within a development environment. The application uses a dataset that the company stores on an Amazon S3 general purpose bucket in the same AWS Region as the EC2 instances.
A SysOps administrator must improve the application's performance for retrieval of objects from Amazon S3.
Which solution will meet these requirements?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract of AWS CloudOps Documents:
The correct answer is D because Amazon S3 Express One Zone with directory buckets and zonal endpoints is specifically designed for single-Availability Zone, high-performance workloads such as HPC, machine learning, and analytics applications running on Amazon EC2. AWS CloudOps documentation states that S3 Express One Zone delivers single-digit millisecond latency and up to 10x higher request performance compared to general purpose S3 buckets when data is accessed from the same Availability Zone.
An S3 directory bucket is required to use the S3 Express One Zone storage class. These buckets are explicitly associated with a single Availability Zone and use zonal endpoints, which eliminate cross-AZ network hops and significantly reduce latency. Importing the data from the existing general purpose bucket ensures compatibility while achieving maximum throughput and lowest latency.
Option A is incorrect because S3 Transfer Acceleration is optimized for long-distance, internet-based transfers, not for in-Region HPC workloads. Option B is incorrect because lifecycle policies cannot move objects into S3 Express One Zone, and S3 Express One Zone does not use Regional endpoints. Option C is incorrect because general purpose buckets do not support zonal endpoints and therefore cannot achieve the same performance benefits.
AWS CloudOps performance optimization guidance clearly identifies S3 directory buckets with S3 Express One Zone and zonal endpoints as the optimal architecture for high-throughput, low-latency workloads in a single Availability Zone.
References:
Amazon S3 User Guide - S3 Express One Zone and Directory Buckets
AWS SysOps Administrator Study Guide - Storage Performance Optimization AWS Well-Architected Framework - Performance Efficiency Pillar
NEW QUESTION # 117
A company has an application running on EC2 that stores data in an Amazon RDS for MySQL Single-AZ DB instance. The application requires both read and write operations, and the company needs failover capability with minimal downtime.
Which solution will meet these requirements?
Answer: A
Explanation:
According to the AWS Cloud Operations and Database Reliability documentation, Amazon RDS Multi-AZ deployments provide high availability and automatic failover by maintaining a synchronous standby replica in a different Availability Zone.
In the event of instance failure, planned maintenance, or Availability Zone outage, Amazon RDS automatically promotes the standby to primary with minimal downtime (typically less than 60 seconds). The failover is transparent to applications because the DB endpoint remains the same.
By contrast, read replicas (Option B) are asynchronous and do not provide automated failover. Auto Scaling (Option C) applies to EC2, not RDS. RDS Proxy (Option D) improves connection management but does not add redundancy.
Thus, Option A - converting the RDS instance into a Multi-AZ deployment - delivers the required high availability and business continuity with minimal operational effort.
Reference: AWS Cloud Operations & Database Continuity Guide - Implementing Multi-AZ Deployments for Automatic RDS Failover
NEW QUESTION # 118
A company has an internal web application that runs on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group in a single Availability Zone. A CloudOps engineer must make the application highly available.
Which action should the CloudOps engineer take to meet this requirement?
Answer: D
Explanation:
High availability for an EC2-based web application behind an ALB is primarily achieved by eliminating single points of failure at the infrastructure layer. A single Availability Zone (AZ) deployment is vulnerable to AZ-level impairment (power/network issues, facility events, or service disruptions). The most direct and standard AWS approach is to distribute the Auto Scaling group across multiple AZs within the same Region.
Updating the Auto Scaling group to use subnets in at least two AZs allows instances to be launched across AZs automatically. The ALB is built to route traffic across targets in multiple AZs, and Auto Scaling can replace unhealthy instances in any enabled AZ. This provides resilience without the complexity of multi- Region architectures.
Options A and B address capacity for peak load but do not address the core availability requirement. Even with more instances, a full AZ outage would still take the entire application down if all instances are in the same AZ.
Option D (multi-Region) can improve resilience further, but it introduces significantly more operational overhead: cross-Region traffic routing, data replication, DNS failover strategy, application state handling, and potentially active-active or active-passive designs. For "make the application highly available" from a single- AZ baseline, multi-AZ in the same Region is the standard, least-overhead improvement.
NEW QUESTION # 119
A company has a multi-account AWS environment that includes the following:
- A central identity account that contains all IAM users and groups
- Several member accounts that contain IAM roles
A SysOps administrator must grant permissions for a particular IAM group to assume a role in one of the member accounts. How should the SysOps administrator accomplish this task?
Answer: B
Explanation:
Cross-account role assumption requires two explicit permissions. AWS CloudOps documentation states that the target role must trust the principal, and the principal must be allowed to call sts:AssumeRole.
In the member account, the role's trust policy must list the IAM group ARN (or the identity account) as a trusted principal. In the identity account, the IAM group must have an inline or attached policy that allows the sts:AssumeRole action for the target role ARN. This dual configuration enables secure and controlled cross-account access.
NEW QUESTION # 120
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