N10-009 Exam Dumps - CompTIA Network+ Questions and Answers

•A. Isolate smart devices to their own network segment: Network segmentation using VLANs or separate SSIDs ensures that smart devices (like speakers) are not on the same network as guests, preventing unauthorized control.

•E. Change the default credentials: Many IoT devices (e.g., smart speakers) come with default usernames and passwords. If these are not changed, unauthorized users can easily take control.

•Why not the other options?

•B. Configure IPS: IPS (Intrusion Prevention System) detects threats but cannot block specific guest actions on an IoT device.

•C. Install a new AP: A new access point does not solve the unauthorized control issue.

•D. Set up a syslog server: Helps with logging, but does not prevent unauthorized access.

•F. Configure GRE: Generic Routing Encapsulation (GRE) is used for VPN tunneling, which is irrelevant in this case.

A Virtual Private Network (VPN) creates an encrypted connection between a remote user and an internal network, ensuring secure access to internal applications.

VPNs use encryption protocols like IPSec and SSL/TLS to protect data during transmission.

They are widely used for secure remote work, accessing company resources, and bypassing geographic restrictions.

Option B (CDN - Content Delivery Network): Used for speeding up website content delivery, not for remote access security.

Option C (SAN - Storage Area Network): Used for high-speed storage, unrelated to remote access.

Option D (IDS - Intrusion Detection System): Monitors for malicious activities but does not provide secure access to applications.

? Reference: CompTIA Network+ (N10-009) Official Study Guide – Section: Secure Remote Access Technologies

The best mitigation is implementing 802.1X, which provides port-based Network Access Control (NAC). With 802.1X enabled on access switch ports, a device plugged into a wall jack cannot gain normal network access until it successfully authenticates using credentials/certificates via an authentication server (commonly RADIUS). This directly addresses the threat of unauthorized users plugging into publicly accessible conference room jacks, because the switch keeps the port in an unauthenticated state (or places it into a restricted/guest VLAN) until authentication succeeds. This aligns with Network+ security objectives that emphasize controlling access at the edge, enforcing authentication, and reducing the risk of rogue or unmanaged devices on internal networks.

MAC filtering is weaker because MAC addresses can be spoofed and managing allow-lists at scale is error-prone. Creating a trusted zone is vague and does not prevent initial port access; segmentation helps limit blast radius but doesn’t enforce authentication at the jack. Disabling unused services is a general hardening practice, but it does not stop someone from connecting physically to an active switch port and attempting access. 802.1X is purpose-built for this exact scenario.

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Full duplex mode allows devices to send and receive data simultaneously, improving network performance and reducing congestion, which is critical for VoIP and video conferencing.

Breakdown of Options:

A. A VLAN with 100Mbps speed limits – VLANs segment traffic but limiting speeds to 100Mbps would worsen video performance.

B. An IP helper to direct VoIP traffic – IP helper is used for DHCP relay, not for VoIP optimization.

C. A smaller subnet mask – A smaller subnet reduces IP address availability but does not improve network performance.

D. Full duplex on all user ports – Correct answer. Full duplex eliminates collisions, allowing better VoIP and video performance.

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.

Least privilege network access is a principle that restricts users ' access rights to only what is necessary for them to perform their job functions. In this case, the accountant ' s access is limited to only the financial department ' s shared folders, ensuring that they cannot access other parts of the network unnecessarily. This reduces the risk of unauthorized access and potential data breaches. References: CompTIA Network+ Exam Objectives and official study guides.

SNMPv3 is the version of the Simple Network Management Protocol that introduces security enhancements, including message integrity, authentication, and encryption. Unlike previous versions (v1 and v2c), SNMPv3 supports encrypted communication, ensuring that data is not transmitted in plaintext. This provides confidentiality and protects against eavesdropping and unauthorized access.References: CompTIA Network+ study materials.

This describes a Spanning Tree Protocol (STP) loop. If STP isn’t correctly configured or a redundant link is added without STP protection, it causes broadcast storms and network outages.

A. Unused ports disabled would not affect the entire network.

B. Missing default gateway on a switch doesn’t cause total network loss.

**C. Connecting a switch to an access port can cause VLAN mismatches, but not total connectivity loss unless a loop forms.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 3.6 – Explain the characteristics of network topologies and types.

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The correct answer is B. traceroute. Traceroute is a diagnostic command used to track the path that packets take from a source device to a destination across an IP network. It identifies each hop (router or intermediary device) along the route and measures the time it takes for packets to travel between them. This makes it particularly useful for determining where communication is failing or being restricted.

In this scenario, the administrator suspects that other network devices may be restricting traffic, such as routers, firewalls, or access control devices. Traceroute helps pinpoint exactly where packets stop or experience delays, indicating a potential filtering or blocking point in the network path.

The other options are less appropriate. ipconfig is used to view or manage a device’s local IP configuration and does not test packet flow across the network. Nmap is a scanning tool used to identify open ports and services, not to trace packet paths. Ping verifies basic connectivity but does not provide insight into intermediate devices or where traffic may be blocked.

According to CompTIA Network+ objectives, traceroute is the best tool for identifying routing issues and determining whether network devices are restricting traffic.

Switch 1

spanning-tree vlan 10 root primary

spanning-tree vlan 20 root secondary

Switch 2

spanning-tree vlan 20 root primary

spanning-tree vlan 10 root secondary

This PBQ is pointing to a switching loop / MAC flapping problem. The biggest clues are the high CPU utilization and the fact that the MAC table is continuously changing. That behavior is classic for a Layer 2 loop when redundant links exist between switches and no proper spanning-tree root role has been established.

The available commands shown in the screenshots are limited to spanning-tree vlan, so this is not an interface shutdown question. The fix is to use STP per VLAN and make one switch the preferred root for one VLAN and the other switch the preferred root for the other VLAN. That prevents both uplinks from forwarding in an uncontrolled loop while still giving redundancy.

A clean design is:

Switch 1 root primary for VLAN 10

Switch 2 root primary for VLAN 20

Make each opposite switch root secondary for failover

That stabilizes Layer 2 forwarding, stops MAC address flapping, reduces CPU load, and restores normal connectivity. After applying the STP root settings, the user should be able to ping 192.168.1.31 from PC 1 successfully. If your simulator asks for validation, run the ping again from PC 1 to the database server.

The correct answer is Integrity because a hashing algorithm ensures that data has not been altered. According to CompTIA Network+ (N10-009) security objectives, hashing is a cryptographic process that takes input data of any size and produces a fixed-length output known as a hash value or digest. If even a single bit of the original data changes, the resulting hash value will be significantly different.

Hashing is commonly used to verify file integrity, validate message authenticity, and securely store passwords. For example, when downloading software, the vendor may publish a hash value so users can calculate the hash of the downloaded file and confirm it matches, ensuring the file was not tampered with.

Non-repudiation (Option A) typically requires digital signatures that combine hashing with asymmetric encryption to verify the sender’s identity. Confidentiality (Option C) is achieved through encryption, which protects data from unauthorized access. Availability (Option D) refers to ensuring systems and data are accessible when needed and is not related to hashing functions.

Therefore, hashing primarily provides data integrity verification.

Troubleshooting poor performance of a newly installed access point involves multiple steps. Checking for network bottlenecks and ensuring the device firmware is up to date are crucial first steps. The document confirms:“Network bottlenecks can severely limit the performance of even the fastest wireless access points, so it’s essential to verify that no other devices are causing a slowdown. In addition, keeping firmware updated ensures optimal performance and security.”

The correct answer is deploying a mesh network. A mesh wireless network uses multiple interconnected access points that automatically route traffic through the best available path. This ensures seamless coverage throughout a facility, even when users move between APs. Mesh APs can extend coverage without requiring each AP to be directly wired, making them ideal for large or hard-to-wire environments.

A. Ad hoc access points are peer-to-peer connections and cannot provide enterprise-grade continuous coverage.

B. Ethernet drops provide wired connectivity but do not solve wireless coverage issues.

D. Changing the frequency (from 2.4 GHz to 5 GHz or vice versa) may reduce interference but will not guarantee building-wide seamless connectivity.

Mesh networks are particularly effective in environments with roaming devices (smartphones, tablets, handheld scanners) and ensure that there are no dead spots, thereby delivering continuous wireless access.

References (CompTIA Network+ N10-009):

Domain: Network Infrastructure — Wireless architectures, mesh networking, seamless connectivity.

An access point (AP) provides users with an extended footprint that allows connections from multiple devices within a designated Wireless Local Area Network (WLAN).

Router: Typically used to connect different networks, not specifically for extending wireless coverage.

Switch: Used to connect devices within a wired network, not for providing wireless access.

Access Point (AP): Extends wireless network coverage, allowing multiple wireless devices to connect to the network.

Firewall: Primarily used for network security, controlling incoming and outgoing traffic based on security rules, not for providing wireless connectivity.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Explains the roles and functions of network appliances, including access points.

Cisco Networking Academy: Provides training on deploying and managing wireless networks with access points.

Network+ Certification All-in-One Exam Guide: Covers network devices and their roles in creating and managing networks.

The correct answer is public cloud. In public cloud models, a provider (such as AWS, Azure, or Google Cloud) hosts infrastructure and services that are shared across multiple customers, known as multitenancy. Each tenant is logically isolated, but physical infrastructure is shared, allowing providers to achieve economies of scale.

A. Private cloud is dedicated to one organization, not multitenant.

B. Community cloud is shared among organizations with common interests, but it’s less common than public multitenancy.

D. Hybrid cloud combines private and public but does not define tenancy alone.

Public cloud services are the most cost-effective and scalable because they spread costs across many customers, but they require strong security and isolation to protect tenants.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Cloud models, multitenancy, public vs private.