The correct conclusion is that the router is performing NAT overload (PAT), as shown by the `show ip nat translations` command output where multiple inside local addresses (10.0.0.10 and 10.0.0.11) share the same inside global address (192.168.1.10) but are differentiated by unique port numbers. This is the hallmark of Port Address Translation, which conserves public IPs by multiplexing many private hosts behind a single global address. On the ENCOR 350-401 exam, this concept tests your ability to interpret NAT translation tables and distinguish between static NAT, dynamic NAT, and PAT. A common trap is assuming the `---` protocol entry indicates a problem, but it simply means the translation is not protocol-specific or has aged out. Remember the key PAT indicator: one inside global IP with many different port numbers. A useful memory tip is "PAT = Port Address Translation = one IP, many ports."
CCNP NetFlow and Telemetry Practice Question
This 350-401 practice question tests your understanding of netflow and telemetry. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on Router R1:
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global
--- 192.168.1.10:1024 10.0.0.10:1024 203.0.113.5:80 203.0.113.5:80
tcp 192.168.1.10:1025 10.0.0.10:1025 203.0.113.5:80 203.0.113.5:80
--- 192.168.1.11:2048 10.0.0.11:2048 198.51.100.2:443 198.51.100.2:443
Why wrong: Static NAT would show a one-to-one mapping without port numbers; here we see port numbers, indicating PAT.
B
The router is performing dynamic NAT without overload
Why wrong: Dynamic NAT without overload would not show port numbers in the inside global column; it would show only IP addresses.
C
The router is performing NAT overload (PAT)
Multiple inside local addresses (10.0.0.10 and 10.0.0.11) are using the same inside global address (192.168.1.10) with different port numbers, which is characteristic of PAT.
D
The router is performing destination NAT
Why wrong: Destination NAT would show changes to the destination address, not the source address as seen here.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router is performing NAT overload (PAT)
The output shows NAT translations. Inside global addresses are the public IPs seen on the outside, and inside local are the private IPs. The first entry has no protocol (---) indicating a static NAT or a translation that has timed out. The second and third entries are TCP translations. The correct answer is that the router is performing NAT overload (PAT) because multiple inside local addresses are mapped to the same inside global address (192.168.1.10).
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 router is performing static NAT
Why it's wrong here
Static NAT would show a one-to-one mapping without port numbers; here we see port numbers, indicating PAT.
✗
The router is performing dynamic NAT without overload
Why it's wrong here
Dynamic NAT without overload would not show port numbers in the inside global column; it would show only IP addresses.
✓
The router is performing NAT overload (PAT)
Why this is correct
Multiple inside local addresses (10.0.0.10 and 10.0.0.11) are using the same inside global address (192.168.1.10) with different port numbers, which is characteristic of PAT.
Related concept
Static NAT maps one inside address to one outside address.
✗
The router is performing destination NAT
Why it's wrong here
Destination NAT would show changes to the destination address, not the source address as seen here.
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.
Trap categories for this question
Command / output trap
Static NAT would show a one-to-one mapping without port numbers; here we see port numbers, indicating PAT.
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 350-401 NAT questions on configuration and troubleshooting.
NetFlow and Telemetry — This question tests NetFlow and Telemetry — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The router is performing NAT overload (PAT) — The output shows NAT translations. Inside global addresses are the public IPs seen on the outside, and inside local are the private IPs. The first entry has no protocol (---) indicating a static NAT or a translation that has timed out. The second and third entries are TCP translations. The correct answer is that the router is performing NAT overload (PAT) because multiple inside local addresses are mapped to the same inside global address (192.168.1.10).
What should I do if I get this 350-401 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 350-401 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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