CompTIA Updated N10-009 Exam Questions and Answers by emmeline

VLAN hopping is an attack where an attacker crafts packets with multiple VLAN tags, allowing them to traverse VLAN boundaries improperly. This can result in gaining unauthorized access to network segments that are supposed to be isolated. The other options do not involve the use of multiple network tags. MAC flooding aims to overwhelm a switch’s MAC address table, DNS spoofing involves forging DNS responses, and ARP poisoning involves sending fake ARP messages.

Power over Ethernet (PoE) allows devices such as cameras, access points, and VoIP phones to receive both power and data over the same Ethernet cable. If only eight out of twelve cameras turn on, the most likely issue is that the PoE switch has exceeded its power budget (total wattage capacity).

PoE Budget Limitation: PoE switches have a maximum power output, which can limit the number of devices they support simultaneously.

Voltage Check: Different PoE standards exist:

802.3af (PoE): Supplies up to 15.4W per port

802.3at (PoE+): Supplies up to 30W per port

802.3bt (PoE++): Supplies up to 60-100W per port

Power Draw Calculation: If each camera requires 15W and the switch can only provide 120W, then only 8 cameras (8 × 15W = 120W) will turn on.

Incorrect Options:

A. Ethernet Cable Type: Most PoE devices work with Cat5e and above. Cable type could be an issue, but power limitation is the more immediate concern.

C. Transceiver Compatibility: Only relevant if fiber transceivers or modules are in use, but not likely the root cause for power-related issues.

D. DHCP Addressing: DHCP issues affect network connectivity, not power delivery.

To increase overall security after a recent breach, implementing least privilege network access and central policy management are effective strategies.

Least Privilege Network Access: This principle ensures that users and devices are granted only the access necessary to perform their functions, minimizing the potential for unauthorized access or breaches. By limiting permissions, the risk of an attacker gaining access to critical parts of the network is reduced.

Central Policy Management: Centralized management of security policies allows for consistent and streamlined implementation of security measures across the entire network. This helps in quickly responding to security incidents, ensuring compliance with security protocols, and reducing the chances of misconfigurations.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Discusses network security principles, including least privilege and policy management.

Cisco Networking Academy: Provides training on implementing security policies and access controls.

Network+ Certification All-in-One Exam Guide: Covers strategies for enhancing network security and managing policies effectively.

Switches in sealed enclosures are at risk of overheating because airflow is restricted. The temperature factor is critical since heat buildup can damage components, shorten device lifespan, and cause outages. Proper cooling or ventilation must be ensured.

A. Fire suppression is important for data centers but not the primary concern in a sealed box.

B. Power budget applies to PoE allocations, not environmental safety.

D. Humidity matters, but overheating is far more immediate in sealed environments.

References (CompTIA Network+ N10-009):

Domain: Network Infrastructure — Environmental considerations, switch installation, temperature control.