mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine this configuration: interface…
Examine this configuration:
interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.0 ip nat inside
!
interface GigabitEthernet0/1 ip address 198.51.100.1 255.255.255.0 ip nat outside
!
ip nat inside source static tcp 10.0.0.10 80 198.51.100.10 8080 extendable
Which statement is true?
⚠ Common exam trap
Cisco often tests the misconception that static NAT translates all traffic from an inside host, when in fact a static NAT with port specification only translates traffic matching that specific protocol and port, leaving other traffic untranslated.
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
✓
Incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80.
The configuration uses a static NAT with TCP port translation (also known as NAT with port forwarding). The command `ip nat inside source static tcp 10.0.0.10 80 198.51.100.10 8080 extendable` creates a one-to-one mapping between the inside local address/port (10.0.0.10:80) and the inside global address/port (198.51.100.10:8080). This means any incoming packet destined to 198.51.100.10 on TCP port 8080 will have its destination translated to 10.0.0.10 port 80, and the response traffic is reverse-translated. Option B correctly describes this behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All traffic from 10.0.0.10 is translated to 198.51.100.10.
Why it's wrong here
Only TCP port 80 is translated; other ports are not affected.
- ✓
Incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80.
Why this is correct
Static NAT/PAT maps the outside address/port to the inside address/port bidirectionally.
- ✗
The 'extendable' keyword is invalid for static NAT.
Why it's wrong here
'extendable' is valid and allows overlapping static translations.
- ✗
This translation will not work unless 'ip nat inside source list' is also configured.
Why it's wrong here
Static NAT is independent and does not require a dynamic NAT rule.
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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which statement accurately describes the behavior of the ip nat inside source static command when configuring static NAT for a single inside host?
easy- A.It dynamically allocates the global address from a pool and removes the entry after an idle timeout.
- ✓ B.It creates a permanent mapping that remains in the NAT table until the configuration is removed.
- C.It requires the use of an access list to define which traffic is translated.
- D.It translates only TCP and UDP traffic by default.
Why B: The `ip nat inside source static` command creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address. This static entry remains in the NAT table indefinitely until the administrator explicitly removes it with the `no ip nat inside source static` command, making option B correct.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.