- A
ACL on outside interface inbound permitting HTTP to DMZ; ACL on inside interface inbound permitting database traffic from DMZ.
Why wrong: Incorrect. Database traffic from DMZ to inside is from lower to higher; ACL on inside inbound would not be evaluated for traffic from DMZ (unless global).
- B
No ACL needed because traffic from higher to lower is implicitly allowed.
Why wrong: Incorrect. Traffic from lower to higher (outside to DMZ) is blocked by default.
- C
ACL on inside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside.
Why wrong: Incorrect. HTTP from outside to DMZ would not be permitted because no ACL on outside.
- D
ACL on outside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside.
Correct. Allows inbound HTTP from outside to DMZ, and outbound database from DMZ to inside.
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.
A network architect is designing a DMZ for a web server farm. The ASA firewall will have three interfaces: inside (level 100), DMZ (level 50), and outside (level 0). They want to allow HTTP traffic from the internet to the DMZ web servers and also allow the web servers to initiate connections to the inside for database updates. What is the minimal ACL configuration to achieve 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
ACL on outside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside.
Traffic from higher to lower security is implicitly allowed, so from inside (100) to DMZ (50) is allowed by default. Traffic from DMZ (50) to inside (100) is blocked by default, so an ACL on the DMZ interface inbound (or inside interface outbound) is needed to permit the database updates. For traffic from outside (0) to DMZ (50), it is from lower to higher, so an ACL on the outside interface inbound is needed to permit HTTP.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ACL on outside interface inbound permitting HTTP to DMZ; ACL on inside interface inbound permitting database traffic from DMZ.
Why it's wrong here
Incorrect. Database traffic from DMZ to inside is from lower to higher; ACL on inside inbound would not be evaluated for traffic from DMZ (unless global).
- ✗
No ACL needed because traffic from higher to lower is implicitly allowed.
Why it's wrong here
Incorrect. Traffic from lower to higher (outside to DMZ) is blocked by default.
- ✗
ACL on inside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside.
- ✓
ACL on outside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside.
Why this is correct
Correct. Allows inbound HTTP from outside to DMZ, and outbound database from DMZ to inside.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-701 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this 350-701 question test?
Network Security — This question tests Network Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: ACL on outside interface inbound permitting HTTP to DMZ; ACL on DMZ interface inbound permitting database traffic to inside. — Traffic from higher to lower security is implicitly allowed, so from inside (100) to DMZ (50) is allowed by default. Traffic from DMZ (50) to inside (100) is blocked by default, so an ACL on the DMZ interface inbound (or inside interface outbound) is needed to permit the database updates. For traffic from outside (0) to DMZ (50), it is from lower to higher, so an ACL on the outside interface inbound is needed to permit HTTP.
What should I do if I get this 350-701 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-701 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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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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