- A
Place the block rule first, then the permit rule.
Why wrong: If block rule is first, all traffic including the specific IPs will be blocked.
- B
Place the permit rule first, then the block rule.
The permit rule matches first for allowed sources; the block rule catches all others.
- C
Use a single rule with permit and block conditions combined.
Why wrong: A single rule cannot simultaneously permit some and block others based on source IP.
- D
Order does not matter because FMC processes rules in parallel.
Why wrong: Rules are processed sequentially from top to bottom.
Question 8 of 1,000
350-701 Network Security Practice Question
This 350-701 practice question tests your understanding of network security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company uses Cisco Firepower Threat Defense (FTD) managed by FMC. They need to create an access control policy that allows traffic from specific source IPs to a web server, but blocks all other traffic. How should the rule base be ordered?
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
✓
Place the permit rule first, then the block rule.
Access control rules are evaluated in order from top to bottom. The first matching rule is applied. Therefore, the permit rule for the specific source IPs must come before the final block rule.
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.
- ✗
Place the block rule first, then the permit rule.
Why it's wrong here
If block rule is first, all traffic including the specific IPs will be blocked.
- ✓
Place the permit rule first, then the block rule.
Why this is correct
The permit rule matches first for allowed sources; the block rule catches all others.
Related concept
Standard ACLs match source addresses.
- ✗
Use a single rule with permit and block conditions combined.
Why it's wrong here
A single rule cannot simultaneously permit some and block others based on source IP.
- ✗
Order does not matter because FMC processes rules in parallel.
Why it's wrong here
Rules are processed sequentially from top to bottom.
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: Place the permit rule first, then the block rule. — Access control rules are evaluated in order from top to bottom. The first matching rule is applied. Therefore, the permit rule for the specific source IPs must come before the final block rule.
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
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