- A
The rule is assigned to the wrong interface
Why wrong: Rules are global by default; interface-specific rules require zone configuration.
- B
The intrusion policy is overriding the block action
Why wrong: Intrusion policy does not override access control actions.
- C
The device is in passive mode
Why wrong: Passive mode only monitors, but the device is inline.
- D
A trust rule exists before the block rule in the policy
Correct. Traffic matching an earlier trust rule will bypass later block rules.
Question 48 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.
A Cisco FTD device is deployed inline and configured with an access control policy that includes a rule to block traffic from a specific source IP address. However, traffic from that IP is still passing through. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
A trust rule exists before the block rule in the policy
In Cisco FTD, the access control policy rules are evaluated in order. If a rule earlier in the order permits the traffic (e.g., a trust rule), subsequent block rules are not evaluated. The rule order must be correct.
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.
- ✗
The rule is assigned to the wrong interface
Why it's wrong here
Rules are global by default; interface-specific rules require zone configuration.
- ✗
The intrusion policy is overriding the block action
Why it's wrong here
Intrusion policy does not override access control actions.
- ✗
The device is in passive mode
Why it's wrong here
Passive mode only monitors, but the device is inline.
- ✓
A trust rule exists before the block rule in the policy
Why this is correct
Correct. Traffic matching an earlier trust rule will bypass later block rules.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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.
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: A trust rule exists before the block rule in the policy — In Cisco FTD, the access control policy rules are evaluated in order. If a rule earlier in the order permits the traffic (e.g., a trust rule), subsequent block rules are not evaluated. The rule order must be correct.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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