CompTIA Updated N10-009 Exam Questions and Answers by indigo

DHCP snooping is a security feature on network switches that helps to prevent unauthorized (rogue) DHCP servers from assigning IP addresses to clients. By implementing DHCP snooping, the network administrator can restrict DHCP responses to authorized servers only, preventing unauthorized DHCP configurations, such as incorrect DNS IPs, from being assigned to clients. This helps prevent man-in-the-middle attacks where malicious actors misconfigure DNS to redirect users to fraudulent sites. (Reference: CompTIA Network+ Study Guide, Chapter on Network Security)

The most likely cause is that the PoE power budget has been exceeded. Wireless access points commonly receive power through Power over Ethernet. If newly installed APs are not broadcasting at all, one of the first things to verify is whether the switch has enough available PoE capacity to power them. A switch can have enough physical ports available but still lack sufficient PoE wattage. When the total PoE budget is exhausted, some APs may fail to power on, partially boot, reboot repeatedly, or never begin broadcasting an SSID.

The CompTIA Network+ N10-009 objectives include network devices, wireless infrastructure, PoE, power budgets, and troubleshooting physical connectivity. Wireless APs must have both data connectivity and sufficient power before they can operate normally. An improper VLAN assignment could prevent clients from reaching network resources or receiving DHCP addresses, but the AP would usually still power on and broadcast. Limited signal strength would affect coverage, not prevent broadcasting entirely. An uplink transceiver issue applies more to fiber or modular uplink connections and is less likely for newly installed APs. Therefore, the best answer is PoE power budget exceeded.

Understanding the Vulnerability:

Vulnerabilities in the router CPU can be exploited to cause performance degradation, unauthorized access, or other security issues.

Firmware Update:

Firmware Role: The firmware is low-level software that controls the hardware of a device. Updating the firmware can address vulnerabilities by providing patches and enhancements from the manufacturer.

Procedure: Download the latest firmware from the vendor’s website, follow the manufacturer ' s instructions to apply the update, and verify that the update resolves the vulnerability.

Comparison with Other Options:

Replace the System Board: This is a costly and often unnecessary step if the issue can be resolved with a firmware update.

Patch the OS: Patching the OS is relevant for devices with a full operating system but not directly applicable to addressing a CPU vulnerability on a router.

Isolate the System: Temporarily isolating the system can mitigate immediate risk but does not resolve the underlying vulnerability.

Best Practice:

Regularly check for and apply firmware updates to ensure that network devices are protected against known vulnerabilities.