Network+ DHCP snooping and ARP inspection
DHCP snooping helps distinguish trusted server-facing ports from ordinary client ports and can build binding information. Dynamic ARP inspection can use trusted bindings to validate ARP messages. These controls address different parts of local-network spoofing and need correct trust configuration. Static-addressed devices may require additional handling according to the switch platform and the network design.
How to read the scenario
A control enabled with the wrong trusted ports can interrupt legitimate clients. Verify the topology, expected server path, and validation behavior.
Identify the required outcome, the evidence already provided, and the limits on the technician’s action. Compare every option against those details before deciding. Record why the closest alternative does not meet the stated need.
Original practice example
A guest WLAN should provide internet access while reducing exposure to corporate systems. Which TWO controls should be configured? Select TWO.
- Place guests in a separate segment.
- Deny guest access to internal private services.
- Reuse the administrator network for all guests.
- Permit guests to manage the access points.
Show the answer and explanation
Place guests in a separate segment.; Deny guest access to internal private services.
Segmentation and explicit access restrictions separate guest use from internal resources and management interfaces.
Study questions
Which objective does this guide support?
N10-009, objective 4.3. This independent guide supports original practice and does not replace the full official objectives.
What should I watch for in a scenario?
A control enabled with the wrong trusted ports can interrupt legitimate clients. Verify the topology, expected server path, and validation behavior.
Source and version
CompTIA official N10-009 objectives, objective 4.3. Verified November 5, 2026. Use the exam code when choosing study materials; similarly named certifications can have different objectives.