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NEW QUESTION # 51
A CloudOps engineer creates a new VPC that includes a public subnet and a private subnet. The CloudOps engineer successfully launches 11 Amazon EC2 instances in the private subnet. The CloudOps engineer attempts to launch one more EC2 instance in the same subnet but receives an error stating that not enough free IP addresses are available.
What must the CloudOps engineer do to deploy more EC2 instances?
Answer: B
Explanation:
Each subnet in a VPC has a fixed CIDR range that determines how many private IP addresses are available.
AWS reserves five IP addresses per subnet, reducing the usable address count. Once the available IP addresses are exhausted, no more instances can be launched in that subnet.
AWS does not allow changing the CIDR block of an existing subnet. Therefore, Option A is invalid. Option B does not increase the number of IP addresses; Availability Zones are properties of subnets, not expansions of their CIDR ranges. Option C is incorrect because Elastic IP addresses are public IPs and do not increase the number of private IP addresses available in a subnet.
The only viable solution is to create a new subnet with a larger or additional CIDR range and deploy additional EC2 instances there. This approach aligns with AWS VPC design principles and is the standard method for handling IP exhaustion.
NEW QUESTION # 52
A company has a VPC that contains a public subnet and a private subnet. The company deploys an Amazon EC2 instance that uses an Amazon Linux AMI and has the AWS Systems Manager Agent (SSM Agent) installed in the private subnet. The EC2 instance is in a security group that allows only outbound traffic.
A CloudOps engineer needs to give a group of privileged administrators the ability to connect to the instance through SSH without exposing the instance to the internet.
Which solution will meet this requirement?
Answer: D
Explanation:
EC2 Instance Connect Endpoint (EICE) enables secure SSH access to instances in private subnets without requiring public IP addresses, bastion hosts, or inbound internet access. By deploying the endpoint in the private subnet, administrators can connect securely using IAM-based authentication.
The instance security group must allow inbound SSH (port 22) from the EICE security group. Access control is handled via IAM, which eliminates the need to distribute or manage SSH keys.
Option B incorrectly attempts to use Systems Manager for SSH, which is unnecessary when EICE is available. Option C incorrectly places the endpoint in a public subnet, which does not align with the requirement to keep access private. Option D is incorrect because Systems Manager Session Manager does not require SSH and AmazonEC2ReadOnlyAccess does not allow instance access.
EICE provides the least overhead and most secure SSH access path for private EC2 instances.
NEW QUESTION # 53
An ecommerce company hires a cybersecurity company to audit the ecommerce company's AWS account. The cybersecurity company requests read-only access to the account. The ecommerce company creates an IAM role, adds a trust relationship with the cybersecurity company's AWS account, and adds read-only permissions to the ecommerce company's account.
An employee at the cybersecurity company unsuccessfully tries to assume the read-only role that the ecommerce company created.
A CloudOps engineer at the ecommerce company must resolve the access issue.
Which solution will meet this requirement?
Answer: D
Explanation:
For cross-account role access, the target account must trust the external AWS account, and the principal in the external account must also have permission to call sts:AssumeRole on the target role. Adding that permission to the cybersecurity employee's role allows the employee to assume the read-only role in the ecommerce company's account.
NEW QUESTION # 54
A company hosts a web application on an Amazon EC2 instance. The web server logs are published to Amazon CloudWatch Logs. The log events have the same structure and include the HTTP response codes that are associated with the user requests. The company needs to monitor the number of times that the web server returns an HTTP 404 response.
What is the MOST operationally efficient solution that meets these requirements?
Answer: C
Explanation:
A CloudWatch Logs metric filter can automatically scan log events in real time and extract specific patterns - such as HTTP 404 response codes - to publish custom metrics. This provides continuous, automated monitoring without the need for scheduled queries or external scripts, making it the most operationally efficient and scalable solution.
NEW QUESTION # 55
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: B
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.
NEW QUESTION # 56
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