EX294 Implement advanced Ansible automation Practice Question
This EX294 practice question tests your understanding of implement advanced ansible automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization uses Ansible to manage an AWS EC2 environment. The Ansible control node runs on a Linux server, and the team uses a dynamic inventory script (ec2.py) to automatically populate hosts. Recently, they need to run a playbook only against EC2 instances that have a specific tag, 'Environment', set to 'production'. The team has placed the ec2.ini configuration file in the same directory as the inventory script. However, when they run the playbook with '-i ec2.py', the playbook runs against all instances instead of only production ones. The team verifies that the tag exists on the correct instances and that the environment variable AWS_PROFILE is set correctly. Which action should resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the ec2.ini file to include 'filters = tag:Environment=production' under the [ec2] section.
The ec2.py dynamic inventory script uses ec2.ini settings to filter instances. To filter by tags, the 'regions_exclude' and 'destination_variable' are set, but the 'filters' setting inside the 'ec2' section must be configured to include 'tag:Environment=production'. Option B correctly identifies that the ec2.ini must be modified with the 'filters' option. Option A is incorrect because 'hostname' is for naming hosts, not filtering. Option C would not filter by the tag. Option D is unrelated.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Set the environment variable 'EC2_TAGS=Environment=production' before running the playbook.
Why it's wrong here
ec2.py does not use an environment variable for filtering tags.
✓
Modify the ec2.ini file to include 'filters = tag:Environment=production' under the [ec2] section.
Why this is correct
This restricts the inventory to instances with the specified tag.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use the '--limit' option with the playbook command to specify the tag.
Why it's wrong here
--limit limits hosts after inventory is built, not during population.
✗
Add the option 'hostname = tag_Name' to the ec2.ini file.
Why it's wrong here
This changes host naming but does not filter instances.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.
Implement advanced Ansible automation — This question tests Implement advanced Ansible automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Modify the ec2.ini file to include 'filters = tag:Environment=production' under the [ec2] section. — The ec2.py dynamic inventory script uses ec2.ini settings to filter instances. To filter by tags, the 'regions_exclude' and 'destination_variable' are set, but the 'filters' setting inside the 'ec2' section must be configured to include 'tag:Environment=production'. Option B correctly identifies that the ec2.ini must be modified with the 'filters' option. Option A is incorrect because 'hostname' is for naming hosts, not filtering. Option C would not filter by the tag. Option D is unrelated.
What should I do if I get this EX294 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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