This EX200 practice question tests your understanding of manage security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which three statements about firewalld zones are correct? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The default zone can be changed using firewall-cmd.
Option A is true: default zone can be changed. Option B is false: zones can have targets like 'default', 'ACCEPT', 'DROP', 'REJECT', not only 'DROP' or 'ACCEPT'. Option C is false: an interface can belong to only one zone. Option D is true: rich rules allow detailed control. Option E is true: public is more restrictive than trusted.
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.
✓
The default zone can be changed using firewall-cmd.
Why this is correct
--set-default-zone changes the default zone.
Related concept
Static NAT maps one inside address to one outside address.
✗
A network interface can be assigned to multiple zones simultaneously.
Why it's wrong here
Each interface can be in only one zone at a time.
✓
The 'public' zone is more restrictive than the 'trusted' zone.
Why this is correct
Public is untrusted, trusted is least restrictive.
Related concept
Static NAT maps one inside address to one outside address.
✓
Rich rules can specify source and destination addresses.
Why this is correct
Rich rules allow detailed filtering.
Related concept
Static NAT maps one inside address to one outside address.
✗
Zones can have a default target of only 'DROP' or 'ACCEPT'.
Why it's wrong here
Zones can also have 'default', 'REJECT' targets.
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 EX200 NAT questions on configuration and troubleshooting.
Manage security — This question tests Manage security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The default zone can be changed using firewall-cmd. — Option A is true: default zone can be changed. Option B is false: zones can have targets like 'default', 'ACCEPT', 'DROP', 'REJECT', not only 'DROP' or 'ACCEPT'. Option C is false: an interface can belong to only one zone. Option D is true: rich rules allow detailed control. Option E is true: public is more restrictive than trusted.
What should I do if I get this EX200 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 EX200 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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