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300-410 Practice Question: Runs the following command to verify NAT…
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?
⚠ Common exam trap
Many candidates confuse the 'extended' flag with static NAT or assume it means a single-port translation, when in fact it specifically denotes PAT with port multiplexing, as seen in dynamic overload configurations.
Answer choices
Why each option matters
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 in the output of 'show ip nat translations verbose' indicates that the NAT translation includes Layer 4 port information, which is characteristic of Port Address Translation (PAT) or NAT overload. This allows multiple internal hosts to share a single public IP address by using unique port numbers, as opposed to a simple one-to-one translation without port multiplexing.
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 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.
Why this is correct
Extended NAT entries include protocol and port numbers for 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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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