mediumMultiple Choice
350-401 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global --- 203.0.113.10 192.168.1.10 --- --- --- 203.0.113.11 192.168.1.11 --- --- tcp 203.0.113.10:1024 192.168.1.10:1024 198.51.100.5:80 198.51.100.5:80
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between static and dynamic NAT by showing entries with '---' in the protocol field, which candidates may misinterpret as incomplete data or PAT, but it actually indicates a static mapping that does not use ports.
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 router is performing static NAT for two internal hosts.
The output shows two entries with '---' for protocol, indicating static NAT translations that map inside local addresses (192.168.1.10, 192.168.1.11) to inside global addresses (203.0.113.10, 203.0.113.11). The third entry is a dynamic translation for TCP traffic, but the presence of static entries confirms that static NAT is configured for at least two internal hosts. Therefore, option A is correct.
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 for two internal hosts.
Why this is correct
These translations are one-to-one and permanent, with no protocol or port fields and no outside address — a signature of manually configured static NAT. Each entry maps a private inside-local address to a public inside-global address, allowing consistent inbound and outbound connectivity for those two hosts. There is no address-pool assignment or timeout behavior, which further distinguishes it from dynamic and PAT translations.
- ✗
The router is performing dynamic NAT for all translations.
Why it's wrong here
Dynamic NAT would create translations on demand from a pool of public addresses and tear them down after an idle timeout, so all entries would reflect temporary assignments. The first two entries are clearly static because they persist regardless of traffic and lack the protocol and outside information that accompanies dynamically learned translations. Even if the third entry is dynamic, the presence of two permanent entries makes the statement 'all translations' incorrect.
- ✗
The router is performing Port Address Translation (PAT) for all translations.
Why it's wrong here
PAT overloads a single public IP by using unique source port numbers for each concurrent session, so every translation would appear as a protocol type (TCP/UDP) with a port in both inside-local and inside-global addresses. The first two entries contain no port numbers at all, which immediately rules out PAT for those translations. The third entry may involve a port, but that alone does not make the overall NAT operation PAT for all translations, and the static entries remain unaffected.
- ✗
The router is translating outside global addresses to inside local addresses.
Why it's wrong here
NAT configuration proceeds from inside-local to inside-global addresses, meaning source internal private addresses are translated to public addresses before leaving the network. The given entries follow that direction, so they are not translating outside global addresses to inside local addresses. A translation of outside global to inside local would be destination NAT, typically used to redirect inbound traffic to a specific server, and would be visibly labeled as such in the translation table.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.