Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A company wants to allow external users to access a web server located in the DMZ. The firewall has three interfaces: inside, outside, and DMZ. Which firewall rule is necessary?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
A
Allowing from inside to DMZ would permit internal users to access the web server, not external users.
B
Best answer
B
This rule permits external users to initiate connections to the web server in the DMZ on port 80.
C
Distractor review
C
Allowing from DMZ to inside is not needed for external access and could pose a security risk.
D
Distractor review
D
A deny rule from outside to inside would block all incoming traffic, defeating the purpose.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this N10-009 question test?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: B — To allow external users to reach the web server, the firewall must permit traffic from the outside (internet) interface to the DMZ interface on the appropriate port (HTTP port 80). Other rules may be needed for return traffic, but this is the primary rule.
What should I do if I get this N10-009 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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