- A
nat (inside,outside) dynamic interface
Why wrong: This performs PAT, not NAT exemption.
- B
nat (inside,outside) source dynamic any interface
Why wrong: This overloads all inside traffic to the outside interface IP.
- C
access-list outside_access_in permit ip 192.168.1.0 255.255.255.0 any
Why wrong: ACLs do not control NAT; they control traffic flow.
- D
nat (inside,outside) source static 192.168.1.0 192.168.1.0 no-proxy-arp route-lookup
This creates an identity NAT (no translation) for the subnet.
Question 964 of 988
350-701 Network Security Practice Question
This 350-701 practice question tests your understanding of network security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An organization has a Cisco ASA with two interfaces: inside (security 100) and outside (security 0). They want to allow traffic from inside to outside without NAT for a specific subnet. Which configuration achieves this?
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
✓
nat (inside,outside) source static 192.168.1.0 192.168.1.0 no-proxy-arp route-lookup
A NAT exemption rule with 'nat 0' (on ASA 9.x+) or 'nat (inside,outside) source static' with an identity NAT can be used. In modern ASA, 'nat (inside,outside) source static NET NET no-proxy-arp route-lookup' is typical.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
nat (inside,outside) dynamic interface
- ✗
nat (inside,outside) source dynamic any interface
Why it's wrong here
This overloads all inside traffic to the outside interface IP.
- ✗
access-list outside_access_in permit ip 192.168.1.0 255.255.255.0 any
Why it's wrong here
ACLs do not control NAT; they control traffic flow.
- ✓
nat (inside,outside) source static 192.168.1.0 192.168.1.0 no-proxy-arp route-lookup
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 350-701 question test?
Network Security — This question tests Network Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: nat (inside,outside) source static 192.168.1.0 192.168.1.0 no-proxy-arp route-lookup — A NAT exemption rule with 'nat 0' (on ASA 9.x+) or 'nat (inside,outside) source static' with an identity NAT can be used. In modern ASA, 'nat (inside,outside) source static NET NET no-proxy-arp route-lookup' is typical.
What should I do if I get this 350-701 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jul 4, 2026
This 350-701 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 350-701 exam.
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