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

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.

Introduction to OSI Model:

The OSI model is a conceptual framework used to understand network interactions in seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

Application Layer:

The application layer (Layer 7) is the topmost layer in the OSI model. It provides network services directly to end-user applications. This layer facilitates communication between software applications and lower layers of the network protocol stack.

Reliance on Other Layers:

The application layer relies on the transport layer (Layer 4) for data transfer across the network. The transport layer ensures reliable data delivery through protocols like TCP and UDP.

The network layer (Layer 3) is responsible for routing packets to their destination.

The data link layer (Layer 2) handles node-to-node data transfer and error detection.

The physical layer (Layer 1) deals with the physical connection between devices.

Explanation of the Options:

A. It relies upon other layers for packet delivery: This is correct. The application layer depends on the lower layers (transport, network, data link, and physical) for the actual delivery of data packets.

B. It checks independently for packet loss: This is incorrect. Packet loss detection is typically handled by the transport layer (e.g., TCP).

C. It encrypts data in transit: This is incorrect. Encryption is typically handled by the presentation layer or at the transport layer (e.g., TLS/SSL).

D. It performs address translation: This is incorrect. Address translation is performed by the network layer (e.g., NAT).

Conclusion:

The application layer’s primary role is to interface with the end-user applications and ensure that data is correctly presented to the user. It relies on the underlying layers to manage the actual data transport and delivery processes.

Comprehensive and Detailed Explanation (aligned to N10-009):

A broadcast message is delivered to all nodes in a broadcast domain (e.g., ARP requests).

A. Unicast is one-to-one.

C. Multicast is one-to-many but only to subscribed members.

D. Anycast is one-to-one-of-many, sending to the nearest node.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Traffic types: unicast, multicast, broadcast, anycast.

Port 22 is used for SFTP (Secure File Transfer Protocol) and SCP (Secure Copy Protocol), which encrypt file transfers using SSH (Secure Shell). This ensures data is transmitted securely over the network.

•Why not the other options?

•Port 69 (B) – TFTP (Trivial File Transfer Protocol): Transfers files but is not secure (no encryption).

•Port 80 (C) – HTTP: Used for web traffic, not for file transfer.

•Port 3389 (D) – RDP (Remote Desktop Protocol): Used for remote desktop access, not file transfer.

Clientless VPNs allow users to access network resources through a secure web portal using a browser, with no VPN software needed. This is ideal for occasional access to internal resources via HTTPS.

A. Proxy is a gateway for accessing web content, not a VPN.

C. Site-to-site VPN connects entire networks, not individual users.

D. Direct Connect usually refers to dedicated cloud connections, not VPNs.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 3.3 – Given a scenario, configure and deploy common VPN technologies.

SNMPv3 (Simple Network Management Protocol version 3) provides device monitoring with authentication and encryption. This enhances network visibility and security by ensuring that monitoring data is securely transmitted and access to network devices is authenticated.

Authentication: SNMPv3 includes robust mechanisms for authenticating users accessing network devices.

Encryption: It provides encryption to protect the integrity and confidentiality of the data being transmitted.

Network Management: SNMPv3 allows for detailed monitoring and management of network devices, ensuring better control and security.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Covers SNMP versions, their features, and security enhancements in SNMPv3.

Cisco Networking Academy: Provides training on implementing and securing SNMP for network management.

Network+ Certification All-in-One Exam Guide: Explains the benefits and security features of SNMPv3 for network monitoring.

Quality of Service (QoS) prioritizes delay-sensitive traffic such as VoIP by assigning higher priority in queues, reducing jitter, latency, and packet loss. Implementing QoS policies ensures stable and clear voice communication.

B. STP (Spanning Tree Protocol) prevents switching loops, but it does not address jitter or real-time traffic performance.

References (CompTIA Network+ N10-009):

Domain: Network Infrastructure — QoS, traffic shaping, prioritization of voice/video.

The answer is C. Multicast . The address 224.7.8.99 falls within the IPv4 Class D range, which is 224.0.0.0 through 239.255.255.255 . That range is reserved for multicast traffic. Multicast is used when one sender needs to deliver traffic to a specific group of receivers rather than to every device on the network or to just one destination.

That is what separates it from the other choices. Broadcast is intended for all hosts on the local broadcast domain. Unicast is one-to-one communication, where a single source sends traffic to one specific destination. Anycast is typically associated with sending traffic to the nearest or best member of a group that shares the same address, not to a multicast group address in the 224.0.0.0/4 range.

From a Network+ point of view, this is a basic address-recognition question. Once you recognize that the destination begins with 224 , the answer should immediately point to multicast. Protocols and streaming applications often use multicast when they need efficient delivery to multiple interested hosts without flooding every device. So in this case, the traffic type is clearly multicast .

802.11ax, also known as Wi-Fi 6, is designed for high-density environments and improves device saturation and coverage compared to previous standards.

802.11ac: While it offers high throughput, it is not optimized for high-density environments as effectively as 802.11ax.

802.11ax (Wi-Fi 6): Introduces features like OFDMA, MU-MIMO, and BSS Coloring, which enhance performance in crowded environments, reduce latency, and increase the number of devices that can be connected simultaneously.

802.11g and 802.11n: Older standards that do not offer the same level of efficiency or support for high device density as 802.11ax.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Covers the 802.11 standards and their capabilities.

Cisco Networking Academy: Provides training on Wi-Fi technologies and best practices for high-density deployments.

Network+ Certification All-in-One Exam Guide: Discusses the various 802.11 standards and their applications in different environments.

To monitor server availability, SNMP traps are the best choice. SNMP (Simple Network Management Protocol) allows devices to send alerts (traps) when certain conditions are met, such as server downtime or high resource usage.

Breakdown of Options:

A. Packet capture – Capturing packets provides insights into network traffic but does not actively monitor server availability.

B. Data usage reports – These analyze network traffic consumption but do not indicate whether a server is available or not.

C. SNMP traps – Correct answer. SNMP traps notify administrators of server issues in real time.

D. Configuration monitoring – This tracks configuration changes rather than availability.

Border Gateway Protocol (BGP): BGP is the most commonly used routing protocol for interconnecting WANs, especially across the internet. It is used for exchanging routing information between autonomous systems (AS), making it the backbone protocol for large-scale WANs.

IGP (A): Interior Gateway Protocols like OSPF and EIGRP are typically used within a single AS, not between them.

EIGRP (B): While it is efficient, EIGRP is primarily used for intra-domain routing and not ideal for WAN interconnection.

OSPF (D): While OSPF can be used for WANs, it is not as common as BGP for inter-AS communication.

When a host fails to obtain an IP address from a DHCP server, it assigns itself an APIPA (Automatic Private IP Addressing) address in the 169.254.x.x range, commonly described as a “self-assigned IP.” This prevents communication outside the local link, including reaching the default gateway.

B. RFC1918 addresses are private ranges (10.x.x.x, 172.16–31.x.x, 192.168.x.x), but these are not self-assigned.

C. If the TCP/IP stack were disabled, the host wouldn’t have any IP at all.

D. If a static IP were assigned, it would show a configured value, not self-assigned.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — IP addressing issues, DHCP failures, APIPA behavior.

802.1X is a port-based network access control (PNAC) protocol that provides an authentication mechanism to devices wishing to connect to a LAN or WLAN. It is widely used for secure network access, ensuring that only authenticated devices can access the network, whether they are connecting via wired or wireless means. 802.1X works in conjunction with an authentication server, such as RADIUS, to validate the credentials of devices trying to connect.References: CompTIA Network+ study materials.

When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related to routing. Devices on different subnets require a default gateway to route traffic between networks.

If the default gateway is incorrectly configured, the device won’t know how to reach other subnets.

Faulty cables (Option B) or duplex mismatches (Option C) would likely cause connectivity issues even within the local subnet, which is not the case here.

VLAN mismatches (Option D) are typically issues with switch port configurations and would likely cause total loss of connectivity, including within the same subnet.

✅ So, the most probable and logical cause is an incorrect default gateway.

A mesh network is the best solution for providing reliable wireless service to public safety vehicles. In a mesh network, each node (vehicle) can connect to multiple other nodes, providing multiple paths for data to travel. This enhances reliability and redundancy, ensuring continuous connectivity even if one or more nodes fail. Mesh networks are highly resilient and are well-suited for dynamic and mobile environments such as public safety operations.References: CompTIA Network+ study materials.