Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A security auditor discovers that several unused switch ports are in default configuration. The auditor recommends implementing a security measure that will disable the port if an unauthorized device is connected, and then automatically re-enable the port after a specified time period. Which feature should be configured on the switch ports?
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
802.1X with RADIUS authentication and guest VLAN
802.1X can place unauthorized devices in a guest VLAN but does not disable the port or automatically re-enable it based on a simple time period.
B
Best answer
Port security with violation mode 'shutdown' and errdisable recovery interval
Port security shutdown disables the port on violation, and errdisable recovery allows automatic re-enablement after a configured time.
C
Distractor review
DHCP snooping and dynamic ARP inspection
These features prevent DHCP spoofing and ARP poisoning but do not disable ports on unauthorized connection or auto-recover.
D
Distractor review
Storm control and broadcast suppression
These control traffic storms, not unauthorized device access.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
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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?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: Port security with violation mode 'shutdown' and errdisable recovery interval — Port security with violation mode 'shutdown' disables the port when a violation occurs (e.g., unknown MAC address). The port must be manually re-enabled or configured with 'errdisable recovery' to automatically re-enable after a timeout. This matches the requirement: disable on unauthorized device, then auto-reenable after time.
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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