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hardmultiple choiceObjective-mapped

A security engineer is configuring a firewall to protect an internal network. The requirement is that internal users can initiate connections to the internet, but external hosts should not be able to initiate connections to internal hosts unless the internal host first requested the connection. Which firewall technology should be used?

Question 1hardmultiple choice
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A security engineer is configuring a firewall to protect an internal network. The requirement is that internal users can initiate connections to the internet, but external hosts should not be able to initiate connections to internal hosts unless the internal host first requested the connection. Which firewall technology should be used?

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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

Stateless packet filtering

Stateless firewalls filter each packet independently without considering connection state, making them unable to allow only return traffic.

B

Best answer

Stateful inspection

Stateful firewalls track the state of connections and permit inbound packets only if they match an existing session.

C

Distractor review

Application proxy

Application proxy acts as an intermediary and can filter at the application layer, but it is not the primary technology for stateful traffic control.

D

Distractor review

Packet filtering based on ACL only

ACL-based filtering is stateless and would require explicit rules for return traffic, which is less efficient.

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.

Question 1

A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?

Question 2

A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?

Question 3

A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?

Question 4

A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?

Question 5

A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?

Question 6

A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?

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: Stateful inspection — Stateful inspection firewalls maintain a state table to track active connections and allow return traffic only for established sessions, blocking unsolicited inbound traffic.

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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