- A
The packet is forwarded because the security levels allow traffic from higher to lower, and an ACL permits it.
Correct. Higher to lower is allowed by default, and the ACL explicitly permits the traffic.
- B
The packet is dropped because no ACL is applied to the DMZ interface.
Why wrong: The ACL is applied to the inside interface, which is sufficient for inbound traffic.
- C
The packet is dropped because traffic from higher to lower security levels is implicitly denied.
Why wrong: Traffic from higher to lower is implicitly allowed; only lower to higher is implicitly denied.
- D
The packet is forwarded only if a NAT rule exists for the source address.
Why wrong: NAT is not required for traffic from inside to DMZ unless the destination expects a translated address.
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 engineer configures a Cisco ASA firewall with three interfaces: inside (security level 100), outside (security level 0), and DMZ (security level 50). Traffic from the inside network to the DMZ network is sourced from 10.1.1.0/24 and destined to 192.168.1.0/24. The inside interface is configured with IP 10.1.1.1, DMZ interface with IP 192.168.1.1. An ACL on the inside interface permits IP traffic from 10.1.1.0/24 to 192.168.1.0/24. What happens when a packet from 10.1.1.10 to 192.168.1.10 arrives at the inside interface?
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 packet is forwarded because the security levels allow traffic from higher to lower, and an ACL permits it.
The ASA allows traffic from higher to lower security levels by default, but only if an ACL permits it. Since the inside level (100) is higher than DMZ (50), and the ACL permits the traffic, the packet is forwarded.
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.
- ✓
The packet is forwarded because the security levels allow traffic from higher to lower, and an ACL permits it.
- ✗
The packet is dropped because no ACL is applied to the DMZ interface.
Why it's wrong here
The ACL is applied to the inside interface, which is sufficient for inbound traffic.
- ✗
The packet is dropped because traffic from higher to lower security levels is implicitly denied.
Why it's wrong here
Traffic from higher to lower is implicitly allowed; only lower to higher is implicitly denied.
- ✗
The packet is forwarded only if a NAT rule exists for the source address.
Why it's wrong here
NAT is not required for traffic from inside to DMZ unless the destination expects a translated address.
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.
Visual reference
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 350-701 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-701 question test?
Network Security — This question tests Network Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The packet is forwarded because the security levels allow traffic from higher to lower, and an ACL permits it. — The ASA allows traffic from higher to lower security levels by default, but only if an ACL permits it. Since the inside level (100) is higher than DMZ (50), and the ACL permits the traffic, the packet is forwarded.
What should I do if I get this 350-701 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 350-701 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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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