This PCNSA practice question tests your understanding of core concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
Refer to the exhibit.
configure
edit vsys1
set rulebase nat rules mynat
set destination nat
set original-packet source-zone trust
set original-packet destination-address 203.0.113.10
set original-packet destination-port 80
set translated-packet source-zone trust
set translated-packet destination-address 10.0.0.5
set translated-packet destination-port 80
Refer to the exhibit. A packet arrives with source IP 192.168.1.10, destination IP 203.0.113.10, destination port 80, from zone trust. After this NAT rule is applied, what will be the destination IP and port of the packet?
Refer to the exhibit.
configure
edit vsys1
set rulebase nat rules mynat
set destination nat
set original-packet source-zone trust
set original-packet destination-address 203.0.113.10
set original-packet destination-port 80
set translated-packet source-zone trust
set translated-packet destination-address 10.0.0.5
set translated-packet destination-port 80
A
Destination IP 10.0.0.5, Destination port 80, Source IP changed to firewall IP
Why wrong: No source NAT is configured in this rule; source IP remains 192.168.1.10.
B
Destination IP 203.0.113.10, Destination port 8080
Why wrong: The rule specifies translation to 10.0.0.5:80, not port 8080.
C
Destination IP 203.0.113.10, Destination port 80, Source port changed to 5000
Why wrong: Source port is not changed by this rule; only destination is translated.
D
Destination IP 10.0.0.5, Destination port 80
The destination NAT translates the destination address and keeps the port as 80.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Destination IP 10.0.0.5, Destination port 80
Option C is correct. The destination NAT rule translates the destination IP from 203.0.113.10 to 10.0.0.5, and the destination port remains 80 (as specified). Option A is wrong because source IP is not changed by this rule (no source NAT configured). Option B is wrong because the port changes to 8080 is not configured. Option D is wrong because the source port is not modified.
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.
✗
Destination IP 10.0.0.5, Destination port 80, Source IP changed to firewall IP
Why it's wrong here
No source NAT is configured in this rule; source IP remains 192.168.1.10.
✗
Destination IP 203.0.113.10, Destination port 8080
Why it's wrong here
The rule specifies translation to 10.0.0.5:80, not port 8080.
✗
Destination IP 203.0.113.10, Destination port 80, Source port changed to 5000
Why it's wrong here
Source port is not changed by this rule; only destination is translated.
✓
Destination IP 10.0.0.5, Destination port 80
Why this is correct
The destination NAT translates the destination address and keeps the port as 80.
Related concept
Static NAT maps one inside address to one outside address.
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 PCNSA NAT questions on configuration and troubleshooting.
Core Concepts — This question tests Core Concepts — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Destination IP 10.0.0.5, Destination port 80 — Option C is correct. The destination NAT rule translates the destination IP from 203.0.113.10 to 10.0.0.5, and the destination port remains 80 (as specified). Option A is wrong because source IP is not changed by this rule (no source NAT configured). Option B is wrong because the port changes to 8080 is not configured. Option D is wrong because the source port is not modified.
What should I do if I get this PCNSA 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 PCNSA 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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Question Discussion
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