Pass the CompTIA Network+ N10-009 Questions and answers with ExamsMirror

The correct answer is Power redundancy because the devices in the rack are equipped with dual power supplies, which are specifically designed to support redundant power sources. According to CompTIA Network+ (N10-009) objectives under high availability and physical infrastructure concepts, redundancy is a key strategy to eliminate single points of failure.

If only one PDU (Power Distribution Unit) is installed, both power supplies from each device may ultimately rely on the same power source. This creates a single point of failure—if the PDU fails or loses upstream power, all connected equipment will shut down despite having dual power supplies.

By installing a second PDU connected to a separate power circuit (and ideally a separate UPS or power feed), each power supply in the servers and switches can connect to different PDUs. If one PDU fails, the other continues delivering power, ensuring uninterrupted operation.

Option B (Failed PSU monitoring) is not the primary reason for adding another PDU. Option C (Surge protection) can be provided by a single PDU. Option D (Electricity conservation) is unrelated to redundancy design.

Therefore, adding a second PDU provides true power redundancy.

The best answer is D. TXT. When a provider asks an administrator to prove ownership of a domain, the most common method is to have the administrator place a specific verification value inside a DNS TXT record. The provider then checks public DNS for that value. If the expected text is present, it confirms that the person managing the migration has control over the domain’s DNS settings.

This matches how TXT records are commonly used in real network environments. They are flexible and can store readable text strings for verification, policy, and security-related purposes. In Network+ study material, TXT records are frequently associated with things like domain validation and email-related configurations such as SPF and other verification mechanisms.

The other record types do not fit this task. An A record maps a hostname to an IPv4 address. A CNAME points one name to another name. A PTR record is used for reverse DNS, mapping an IP address back to a hostname. None of those are typically created just to prove domain ownership during provider onboarding.

The key clue is the phrase “domain ownership proof”, which strongly points to a TXT record.

Definition of MAC Flooding:

MAC flooding is an attack where a malicious actor sends numerous fake MAC addresses to a switch, overwhelming its CAM table. The CAM table stores MAC addresses and their associated ports for efficient traffic forwarding.

Impact of MAC Flooding:

CAM Table Overflow: When the CAM table is full, the switch cannot learn new MAC addresses and is forced to broadcast traffic to all ports, leading to a degraded network performance and potential data interception.

Switch Behavior: The switch operates in a fail-open mode, treating the network as a hub, which can be exploited for eavesdropping on traffic.

Comparison with Other Attacks:

ARP Spoofing: Involves sending false ARP (Address Resolution Protocol) messages to associate the attacker ' s MAC address with the IP address of another device.

Evil Twin: Involves creating a rogue wireless access point that mimics a legitimate one to intercept data.

DNS Poisoning: Involves corrupting the DNS cache with false information to redirect traffic to malicious sites.

Preventive Measures:

Port Security: Configure port security on switches to limit the number of MAC addresses per port, preventing CAM table overflow.

Network Segmentation: Use VLANs to segment network traffic and limit the impact of such attacks.

GSM (Global System for Mobile communications) is the international standard that uses SIM cards to authenticate and connect phones to the cellular network. GSM allows users to place and receive calls while traveling globally, provided they have a SIM card. CDMA, on the other hand, does not use SIM cards in the same way and is primarily used in the United States. (Reference: CompTIA Network+ Study Guide, Chapter on Network Fundamentals)

In a split-tunnel VPN, only corporate traffic is sent through the VPN tunnel, while public internet traffic goes directly through the user’s local ISP. This reduces bandwidth use on the corporate VPN concentrator and improves performance for non-work traffic.

B. Separate tunnels for encrypted traffic describes multi-tunnel VPNs, not split tunneling.

C. All traffic routed through on-site servers is a full-tunnel VPN, not split-tunnel.

D. ACLs balancing traffic relates to routing or load balancing, not VPN split tunneling.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — VPN types, split vs. full tunnel, remote access.

A UPS (Uninterruptible Power Supply) provides backup power to devices during a power outage, allowing for continuous operation and protecting against sudden shutdowns that could cause data loss or equipment damage. The document confirms:

“A UPS (Uninterruptible Power Supply) is essential for maintaining power to critical devices during an outage, protecting data and ensuring continuous operation until power is restored or a safe shutdown can be performed.”

A split-tunnel VPN allows certain traffic (e.g., cloud-based services) to bypass the VPN and go directly to the Internet. This reduces the amount of traffic that needs to traverse the company ' s VPN and Internet connection, conserving bandwidth and reducing costs. It also means that not all traffic is subject to the same level of inspection or filtering, which can improve performance for cloud-based services.References: CompTIA Network+ study materials.

If the business shares or duplicates the ISP-assigned public IP address, routing instability and conflicts will occur. Pinging a public IP like 8.8.8.8 may work (since ICMP can bypass certain conflicts), but browsing websites (which requires stable sessions and return traffic) will fail intermittently.

A. If the default gateway were incorrect, no external connectivity would work at all.

B. VLAN mismatch is an internal issue, not affecting ISP routing.

C. Subnet mask misconfiguration would prevent consistent routing but usually blocks ping too.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Internet connectivity issues, ISP IP conflicts.

Wi-Fi 6E is the best choice for high-density environments, such as a university campus. It:

Supports more devices with OFDMA (Orthogonal Frequency-Division Multiple Access)

Uses the 6GHz band, reducing congestion

Provides faster speeds and lower latency

This makes Wi-Fi 6E ideal for large networks with high-bandwidth demands, like those in a university setting.

Breakdown of Options:

A. Bluetooth – Used for short-range, low-power connections, not large-scale wireless networks.

B. Wi-Fi 6E – ✅ Correct answer. Designed for high-density environments, improving speed and efficiency.

C. 5G – Used for mobile networks, but not ideal for campus-wide local wireless infrastructure.

D. LTE – Used for cellular data, not for campus-wide Wi-Fi.

PaaS (Platform as a Service) is best suited for application development because it provides a managed platform that includes the runtime environment, development frameworks, middleware, databases (often), and build/deployment tooling. In a PaaS model, the cloud provider manages the underlying infrastructure (servers, storage, networking, OS patching, and often the application runtime), allowing developers to focus on writing code, testing, and releasing applications quickly. This aligns with Network+ cloud concepts where service models are compared by responsibility: PaaS reduces operational overhead for the customer and accelerates development through standardized environments and automation.

Mobile access is a use case for remote access solutions (VPN, zero trust access, MDM), not specifically PaaS. An e-commerce site could be hosted using many models (IaaS, PaaS, SaaS), so it’s not the most specific match. Cloud-native software describes an architectural style (microservices, containers, managed services) and can be built using PaaS components, but it is broader than a single “use case” and is not as directly tied to the PaaS definition as application development is. Therefore, application development is the clearest and most accurate PaaS use case.

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In a fiber patch panel, the SC (Subscriber Connector or Standard Connector) is commonly used because of its push-pull design and reliability in enterprise environments.

Breakdown of Options:

A. F-type – Used for coaxial cables (e.g., cable TV), not fiber.

B. RJ11 – Used for telephone lines, not fiber.

C. BNC – Used for coaxial connections, not fiber.

D. SC – ✅ Correct answer. A standard fiber optic connector used in patch panels.

Link aggregation (also known as port trunking or EtherChannel) combines multiple network connections in parallel to increase throughput and provide redundancy. When two switches are connected with multiple links without any additional configuration, a Layer 2 loop may occur. Link aggregation prevents these loops by treating the multiple connections as a single logical link, using a protocol such as LACP (Link Aggregation Control Protocol).

From Andrew Ramdayal’s guide:

“Link aggregation allows you to combine multiple network connections to increase the bandwidth and provide redundancy. It helps prevent Layer 2 loops when connecting switches with multiple links by making them operate as a single logical interface.”

EIGRP(Enhanced Interior Gateway Routing Protocol) supports bothIPv4 and IPv6. While OSPFv3 is specific to IPv6 and RIPv2 only supports IPv4, EIGRP was extended to handle dual-stack environments efficiently.

BGP (Border Gateway Protocol) uses attributes like AS path, origin, and MED (multi-exit discriminator) to determine the best path among multiple available routes.

From Andrew Ramdayal’s guide:

“BGP is the protocol underlying the global routing system of the internet. It is used for routing data between autonomous systems (ASes)... BGP uses a path vector mechanism and maintains a list of attributes for route selection.”