Module 4: Troubleshooting Scenarios

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In this post, I provide accurate answers and detailed explanations for Module 4: Troubleshooting Scenarios of Course 4: Cloud Support Essentials: A Technical Approach – AWS Cloud Support Associate Professional Certificate.

Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question.

Final Assessment

Graded Assignment

1. Which command is used to change the current working directory to the parent directory?

  • cd .. ✅
  • cd ~
  • cd /
  • cd parent
  • cd up

Explanation:
.. represents the parent directory in Linux. The command cd .. moves you up one level in the directory tree.

2. Which of the following commands is used to move a file or directory?

  • cp
  • rm
  • mv ✅
  • ls
  • cd

Explanation:
mv (move) command is used to move files or directories to a different location, and it can also be used to rename them.

3. Which of the following commands is used to search for a specific pattern in files or text streams?

  • ls
  • cat
  • grep ✅
  • W
  • find

Explanation:
grep stands for Global Regular Expression Print. It’s used to search text or search the given file for lines matching a pattern.

4. Which of the following statements accurately describes the role of DNS in the context of web browsing?

  • DNS translates human-readable domain names into IP addresses, enabling computers to communicate with each other. ✅
  • DNS is responsible for encrypting data transmitted between web servers and clients.
  • DNS manages the allocation of IP addresses to devices on a network.
  • DNS is a protocol used for transferring files between computers on the internet.
  • DNS is a firewall that protects computers from unauthorized access.

Explanation:
Computers use IP addresses to communicate. DNS (Domain Name System) translates easy-to-remember names like google.com into their corresponding IP addresses.

5. Which cron expression will run a job on the first day of every month at 6 AM?

  • 0 6 1 * * ✅
  • 0 6 * 1 *
  • 0 6 1 * ?
  • 0 6 * * 1
  • 0 6 1 1 *

Explanation:
In cron:

  • 0 → minute
  • 6 → hour
  • 1 → day of month
  • * → every month
  • * → every day of the week
    → So this means: 6:00 AM, on the 1st of every month.

6. Which of the following commands is used to display a snapshot of all running processes on a Linux system?

  • top
  • ps aux ✅
  • systemctl list-unit-files
  • killall
  • pkill

Explanation:
ps aux lists all running processes along with detailed information like user, CPU usage, and process ID.

7. Which of the following protocols are commonly used for network communication? (Select TWO)

  • TCP (Transmission Control Protocol) ✅
  • FTP (File Transfer Protocol)
  • UDP (User Datagram Protocol) ✅
  • SMTP (Simple Mail Transfer Protocol)
  • HTTP (Hypertext Transfer Protocol)

Explanation:

  • TCP: Ensures reliable and ordered delivery of data.
  • UDP: Faster, but doesn’t guarantee delivery (used in real-time applications like gaming or streaming).

8. Which of the following statements accurately describes the purpose of a health check in Amazon Route 53?

  • A health check monitors the availability of a domain name registration.
  • A health check monitors the availability of a hosted zone in Amazon Route 53.
  • A health check monitors the availability of an AWS resource, such as an EC2 instance or a load balancer. ✅
  • A health check monitors the availability of a specific DNS record in a hosted zone.
  • A health check monitors the availability of an Amazon Route 53 resolver.

Explanation:
Route 53 health checks automatically monitor whether a resource is up and reachable. If not, DNS routing can change based on health check results.

9. Which of the following statements accurately describes the behavior of the AWS CLI when providing incorrect input during the `aws configure` command?

  • The AWS CLI will validate the input and prompt you to re-enter the correct values if they are invalid.
  • The AWS CLI will accept any input, even if it is nonsensical or invalid, without validation. ✅
  • The AWS CLI will automatically detect and correct invalid input based on predefined rules.
  • The AWS CLI will terminate the configuration process if invalid input is provided.

Explanation:
The CLI does not validate entries like Access Keys or Regions during configuration. It’s the user’s responsibility to input the correct values.

10. Which of the following statements about security groups in AWS is true? (Select TWO)

  • Security groups are stateful, meaning that if you allow inbound traffic for a specific port, the corresponding outbound traffic is automatically allowed. ✅
  • Security groups are associated with network interfaces, not instances. ✅
  • Security groups can reference other security groups rules, allowing you to create reusable sets of rules.
  • Security groups are automatically configured with a default rule that allows all inbound traffic.
  • Security groups can span multiple VPCs within the same AWS account and region.

Explanation:

  • Security groups are stateful — AWS automatically allows response traffic.
  • Technically, security groups are attached to the network interfaces (ENIs) of EC2 instances, not directly to the instances themselves.

Related contents:

Module 1: Linux Command Line
Module 2: Command Line Troubleshooting
Module 3: Network Troubleshooting

You might also like:

Course 1: Introduction to Information Technology and AWS Cloud
Course 2: AWS Cloud Technical Essentials
Course 3: Skills and Best Practices for Cloud Support Associates
Course 5: Skills for Working as an AWS Cloud Consultant
Course 6: DevOps on AWS and Project Management
Course 7: Capstone: Preparing to work as a Cloud Support Associate

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