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

Comprehensive and Detailed Explanation From Exact Extract:

After stopping and starting an EC2 instance, the public IP address may change (unless an Elastic IP is attached), but the security group rules remain intact. If the instance is no longer accessible via SSH, it’s likely due to an inbound rule (e.g., for port 22) not being correctly configured or applied. Adding or verifying a rule in the security group associated with the network interface (NIC) to allow SSH (port 22) from the administrator’s IP resolves this. The WGU Cloud Deployment and Operations Study Guide (Section 3.2, Security Groups) states, "Stopping and starting an EC2 instance may require verifying or adding an inbound SSH rule (port 22) in the security group if connectivity is lost due to IP or rule misconfiguration." Route table or IP changes are not the primary issue here.

AWS Trusted Advisor provides recommendations to help follow AWS best practices, analyzing the environment for cost optimization, security, performance, and fault tolerance. It offers actionable insights to improve resource usage. The WGU Cloud Deployment and Operations Study Guide (Section 6.4, Trusted Advisor) states, "Trusted Advisor evaluates your AWS environment against best practices, providing recommendations in categories like cost optimization and security (e.g., enabling MFA or removing unused resources)." Options A, B, and C overstate or misrepresent its role, as it does not focus solely on unused IAM roles, holistic health overviews, or patch recommendations.

The `disk_io_time` metric, collected by the CloudWatch agent on EC2 Linux instances, measures the total time (in milliseconds) that read and write requests have waited on I/O, helping to assess disk performance for instance sizing. The WGU Cloud Deployment and Operations Study Guide (Section 4.1, CloudWatch Agent Metrics) states, "The `disk_io_time` metric, available via the CloudWatch agent, tracks the time spent waiting for I/O operations, providing insight into disk contention for optimizing EC2 instance sizing." disk_read_ops, diskio_reads, and diskio_read_bytes measure operation counts or bytes, not wait times.