Cloud-Deployment-and-Operations Exam Dumps : WGUCloud Deployment and Operations

Comprehensive and Detailed Explanation From Exact Extract:

The Reachability Analyzer in AWS VPC should be used to troubleshoot connectivity issues from on-premises computers to EC2 instances, especially when a network security group (NSG) is suspected. It analyzes the network path and identifies blocked traffic due to NSG rules or route tables. The WGU Cloud Deployment and Operations Study Guide (Section 3.2, VPC Troubleshooting) states, "Reachability Analyzer helps diagnose connectivity issues by simulating traffic paths, identifying if an NSG rule (e.g., blocked port) or route table is causing the problem from on-premises to EC2 public IPs." Flow Logs provide data but not analysis, PrivateLink is for private connections, and Traffic Mirroring is for monitoring.

Comprehensive and Detailed Explanation From Exact Extract:

CloudWatch should be used to identify and shut down idle EC2 instances by monitoring metrics such as CPU utilization or network activity. Custom alarms can be set to trigger an AWS Lambda function or Systems Manager automation to terminate idle instances, optimizing costs. The WGU Cloud Deployment and Operations Study Guide (Section 4.1, CloudWatch Metrics) states, "CloudWatch can monitor EC2 instance metrics like CPUUtilization; an alarm can be configured to invoke a Lambda function to terminate idle instances, ensuring cost efficiency." CloudFront, CloudSearch, and CloudTrail are not designed for this monitoring and automation task.

Elastic Load Balancing (ELB) should be used to horizontally scale Amazon EC2 instances by distributing incoming traffic across multiple instances, improving availability and fault tolerance. ELB works in conjunction with Auto Scaling groups to add or remove instances based on demand. The WGU Cloud Deployment and Operations Study Guide (Section 3.2, Elastic Load Balancing) notes, "Elastic Load Balancing distributes traffic across EC2 instances, enabling horizontal scaling as part of an Auto Scaling group to handle increased load efficiently." Elastic IPs, elastic network interfaces, and Elastic Beanstalk do not provide this scaling functionality.