hardMultiple Choice
200-901 Practice Question: Based on the NAT translation table, what type of…
Exhibit
R1# show ip nat translations Pro Inside global Inside local Outside local Outside global icmp 203.0.113.10:1 10.0.0.1:1 192.0.2.5:1 192.0.2.5:1 tcp 203.0.113.10:80 10.0.0.1:80 192.0.2.5:80 192.0.2.5:80
Based on the NAT translation table, what type of NAT is being used?
⚠ Common exam trap
Cisco often tests the distinction between Dynamic NAT (which uses a pool of public IPs) and PAT (which overloads a single public IP with port numbers), and the trap here is that candidates see multiple translations and assume Dynamic NAT, missing the key clue that the public IP is identical across entries.
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
✓
PAT (overload)
The NAT translation table shows multiple internal IP addresses (e.g., 10.1.1.1, 10.1.1.2) being translated to the same public IP address (e.g., 203.0.113.1) but with different source ports. This is the defining characteristic of Port Address Translation (PAT), also known as NAT overload, where a single public IP is shared among many internal hosts by multiplexing on layer-4 port numbers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dynamic NAT
Why it's wrong here
Dynamic NAT assigns public addresses from a pool on a first-come basis and translates addresses only, leaving port numbers untouched; the table shows ports being rewritten, which dynamic NAT does not perform. Tempting because pool-based translation is common for outbound access, and dynamic NAT would be correct if many hosts shared a pool of public addresses without port overloading.
- ✗
Static PAT
Why it's wrong here
Static PAT maps a fixed internal address and port to a fixed public address and port; the table shows multiple internal hosts sharing one public address with differing translated ports, indicating overloading rather than a fixed one-to-one port mapping. Tempting because static PAT is used to publish internal services, and it would be correct for a permanently reachable server port.
- ✗
Static NAT
Why it's wrong here
Static NAT maps one private address to one public address permanently, with no port translation; the table shows port numbers being rewritten, which static NAT never does. Tempting because static mappings are fixed and predictable, and static NAT would be correct if a single internal host needed a permanent one-to-one public address.
- ✓
PAT (overload)
Why this is correct
PAT (overload) maps many inside local addresses to a single inside global address, differentiating sessions by source port number. The translation table showing multiple private IPs sharing one public IP with distinct port entries confirms port-level multiplexing rather than static or dynamic one-to-one mapping.
Visual reference
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.