350-701 Network Security Practice Question
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.
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
Why it's wrong here
This performs PAT, not NAT exemption.
- ✗
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
Why this is correct
This creates an identity NAT (no translation) for the subnet.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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