Quick Answer
The answer is that the 'extended' flag indicates the translation includes port information, typical of Port Address Translation (PAT). This flag appears in the output of show ip nat translations verbose when the NAT entry is using a combination of IP address and Layer 4 port numbers to map multiple inside local addresses to a single inside global address, rather than a simple one-to-one static mapping. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to interpret NAT operational details and distinguish between dynamic NAT and PAT; a common trap is confusing 'extended' with 'static' or assuming it means the translation is for an extended ACL. Remember the memory tip: "Extended equals ports" — if you see the extended flag, think of PAT multiplexing many internal hosts through one public IP by tracking their unique port numbers.
This 300-410 practice question tests your understanding of nat and pat. 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 to verify NAT translations:
R1# show ip nat translations verbose
Pro Inside global Inside local Outside local Outside global --- 10.2.2.2 10.1.1.1 192.168.1.1 192.168.1.1 create 00:00:15, use 00:00:05, flags: extended, timing-out
What does the 'extended' flag indicate?
The translation is for a single port only.
Why wrong: Extended means multiple ports or sessions are being multiplexed.
The translation includes port information, typical of PAT.
Extended NAT entries include protocol and port numbers for PAT.
The translation is static and never times out.
Why wrong: Static entries have the 'static' flag.
The translation is for a VPN tunnel.
Why wrong: No indication of VPN.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The translation includes port information, typical of PAT.
The 'extended' flag indicates that this is a PAT (Port Address Translation) entry, using port numbers for multiplexing.
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
For each option: why learners choose it and why it is or isn't the right answer here.
The translation is for a single port only.
Why it's wrong here
Extended means multiple ports or sessions are being multiplexed.
The translation includes port information, typical of PAT.
The translation is static and never times out.
Why it's wrong here
Static entries have the 'static' flag.
The translation is for a VPN tunnel.
Why it's wrong here
No indication of VPN.
Common exam traps
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
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.
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
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
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 300-410 NAT questions on configuration and troubleshooting.
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FAQ
NAT and PAT — This question tests NAT and PAT — Static NAT maps one inside address to one outside address..
The correct answer is: The translation includes port information, typical of PAT. — The 'extended' flag indicates that this is a PAT (Port Address Translation) entry, using port numbers for multiplexing.
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 300-410 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
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