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A small business uses a wireless network for employees and guests. The owner wants to ensure that guest devices cannot access internal resources such as file servers and printers. Which network security technique should be implemented?

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A small business uses a wireless network for employees and guests. The owner wants to ensure that guest devices cannot access internal resources such as file servers and printers. Which network security technique should be implemented?

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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

Best answer

VLAN segmentation with separate SSID for guests

Placing guest traffic on a separate VLAN and configuring access control lists (ACLs) prevents guest devices from reaching internal subnets while still providing internet access.

B

Distractor review

MAC address filtering

MAC filtering only controls which devices can associate with the wireless network, but does not restrict access to internal resources once connected.

C

Distractor review

WPA2 encryption

Encryption protects data confidentiality but does not enforce access policies between different user groups within the network.

D

Distractor review

Disabling SSID broadcast

Hiding the SSID is a weak security measure that prevents casual discovery but does not segment traffic or protect internal resources.

Common exam trap

Common exam trap: an active trunk can still block the VLAN you need

A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.

Technical deep dive

How to think about this question

VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.

KKey Concepts to Remember

  • Access ports place end devices into a single VLAN.
  • Trunk ports carry multiple VLANs between switches.
  • Allowed VLAN lists decide which VLANs can cross a trunk.
  • Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

  • Use show vlan brief to verify access VLANs.
  • Use show interfaces trunk to verify trunk state and allowed VLANs.
  • Do not treat every same-VLAN issue as a routing problem.

Related practice questions

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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?

Access ports place end devices into a single VLAN.

What is the correct answer to this question?

The correct answer is: VLAN segmentation with separate SSID for guests — The most effective method is to create separate VLANs for employee and guest traffic, with an SSID for each, and apply ACLs or firewall rules to block guest VLAN from internal resources. MAC filtering is easily bypassed and does not segment traffic. WPA2 encryption protects data in transit but does not control access to resources. Hiding the SSID provides minimal security and does not prevent resource access.

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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