- A
PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
Correct. PAT multiplexes many inside addresses to one outside address by differentiating TCP/UDP ports.
- B
The NAT translation table for PAT includes the inside global IP and port, and the outside global IP and port.
Correct. The full entry includes inside local, inside global, outside local, and outside global addresses and ports.
- C
The command 'ip nat inside source list 1 interface GigabitEthernet0/0 overload' enables PAT using the interface IP.
Correct. This is the standard command for PAT where the interface IP is used as the inside global address.
- D
The 'ip nat inside source static' command automatically enables PAT when multiple inside hosts are configured.
Why wrong: Incorrect. Static NAT creates a one-to-one mapping and does not use PAT; each inside host requires a separate public IP.
- E
The 'ip nat pool' command is required for all PAT configurations.
Why wrong: Incorrect. PAT can use a single interface IP without a pool; a pool is only needed when using a range of addresses.
Quick Answer
The correct answer identifies that the command 'ip nat inside source list 1 interface GigabitEthernet0/0 overload' enables PAT using the interface IP. This is because PAT overload behavior in Cisco IOS relies on unique port numbers to multiplex multiple inside hosts behind a single public IP address, with the NAT table storing a five-tuple mapping—protocol, inside local IP:port, inside global IP:port, outside local IP:port, and outside global IP:port—to track each session. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to distinguish PAT from static NAT or dynamic NAT with a pool, as the overload keyword is the key differentiator; a common trap is confusing 'ip nat inside source static' (which creates a one-to-one mapping without overload) or assuming a pool is required when PAT can use a single interface IP. Remember the mnemonic "POINT" for the five NAT table fields: Protocol, Outside, Inside, Next-hop, and Translation—or simply recall that overload means port multiplexing on one IP.
300-410 NAT and PAT Practice Question
This 300-410 practice question tests your understanding of nat and pat. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE statements about NAT and PAT behavior in Cisco IOS are true? (Choose THREE.)
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 allows multiple inside hosts to share a single public IP address by using unique source port numbers.
PAT (overload) uses unique port numbers to distinguish multiple inside hosts sharing a single public IP. The NAT table stores five tuples (protocol, inside local IP:port, inside global IP:port, outside local IP:port, outside global IP:port). 'ip nat inside source list 1 interface GigabitEthernet0/0 overload' is the correct syntax for PAT with an interface. The 'ip nat inside source static' command creates a one-to-one mapping and does not use overload. The 'ip nat pool' command defines a range of addresses, but PAT can also use a single interface IP.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
- ✓
The NAT translation table for PAT includes the inside global IP and port, and the outside global IP and port.
Why this is correct
Correct. The full entry includes inside local, inside global, outside local, and outside global addresses and ports.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
The command 'ip nat inside source list 1 interface GigabitEthernet0/0 overload' enables PAT using the interface IP.
- ✗
The 'ip nat inside source static' command automatically enables PAT when multiple inside hosts are configured.
- ✗
The 'ip nat pool' command is required for all PAT configurations.
Why it's wrong here
Incorrect. PAT can use a single interface IP without a pool; a pool is only needed when using a range of addresses.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
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
Got this wrong? Here's your next step.
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.
- →
NAT and PAT — study guide chapter
Learn the concepts, then practise the questions
- →
NAT and PAT practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 300-410 question test?
NAT and PAT — This question tests NAT and PAT — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers. — PAT (overload) uses unique port numbers to distinguish multiple inside hosts sharing a single public IP. The NAT table stores five tuples (protocol, inside local IP:port, inside global IP:port, outside local IP:port, outside global IP:port). 'ip nat inside source list 1 interface GigabitEthernet0/0 overload' is the correct syntax for PAT with an interface. The 'ip nat inside source static' command creates a one-to-one mapping and does not use overload. The 'ip nat pool' command defines a range of addresses, but PAT can also use a single interface IP.
What should I do if I get this 300-410 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways 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 TWO statements about NAT overload (PAT) are true? (Choose TWO.)
medium- ✓ A.PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
- B.PAT is only supported with a single public IP address configured on the outside interface.
- ✓ C.PAT is also known as NAT overload and is defined in RFC 2663.
- D.PAT cannot translate traffic for protocols that use static port numbers, such as DNS or HTTP.
- E.PAT requires the ip nat inside source list command with the overload keyword.
Why A: PAT uses port numbers to multiplex multiple inside hosts to a single public IP, and it is commonly used to conserve public IPv4 addresses. PAT can also be used with a pool of addresses, not just a single interface IP.
Last reviewed: Jun 19, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.