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

The correct answer is VLSM (Variable Length Subnet Masking). According to the CompTIA Network+ N10-009 objectives, VLSM allows a network administrator to create subnets of different sizes within the same network, making it ideal for environments where subnet host requirements vary.

In this scenario, the technician must support multiple subnet sizes—60 hosts, 15 hosts, and seven hosts—within a single Class C network. Using a single subnet mask for all eight subnets would either waste a large number of IP addresses or fail to meet host requirements. VLSM solves this problem by allowing each subnet to be assigned a custom subnet mask that closely matches its host needs, maximizing address efficiency.

CIDR enables classless addressing and route aggregation but does not, by itself, describe creating multiple subnet sizes within a single address block. APIPA is a self-assigned addressing mechanism used when DHCP fails and has no relevance to subnet design. RFC 1918 defines private IP address ranges but does not address subnetting strategies.

The Network+ objectives emphasize VLSM as a best practice for efficient IP address management, especially in enterprise environments where conserving address space and meeting diverse departmental requirements are critical. In this case, VLSM is the only solution capable of meeting all stated constraints.

To support VoIP on the same physical ports used by computers:

B. Enable 802.1Q: This standard supports VLAN tagging, allowing voice and data traffic to share the same port using separate VLANs.

D. Set up voice VLANs: Separating voice traffic into its own VLAN improves QoS and manageability.

Other options are not directly related to configuring VoIP over existing ports:

A. Network translation definitions (NAT) are unrelated to switch-level VLAN configuration.

C. Routing protocols are not necessary at the switch level for VLAN setup.

E. DNS is not required for the switch or VLAN setup.

F. Perimeter network (DMZ) is used for public-facing servers, not VoIP VLANs.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 2.3 – Given a scenario, configure and verify VLANs.

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

Port Address Translation (PAT) allows multiple internal devices to share a single public IP address by assigning each device a unique port number. This is the most common method used in environments where many systems need internet access but there are limited public IP addresses.

The netstat output shows that multiple ports are open, including Telnet (23), FTP (20), and TFTP (69), which are potential security risks. Disabling unused ports minimizes the attack surface, reducing security vulnerabilities.

Breakdown of Options:

A. Disable the unused ports – Correct answer. Unused ports should be closed to prevent unauthorized access.

B. Enforce access control lists – ACLs help control access but do not disable unnecessary services.

C. Perform content filtering – Content filtering controls web traffic, not port security.

D. Set up a screened subnet – A DMZ (screened subnet) improves security but does not address open ports.

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

Multimode fiber uses multiple paths (modes) of light that bounce off the cladding to travel through the fiber. This is effective for shorter distances but more prone to dispersion.

A. Twinaxial is copper, not fiber.

B. Coaxial carries electrical signals, not light.

C. Single-mode fiber uses a single light path directly through the core without bouncing.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Fiber optics: single-mode vs. multimode.

SSH (Secure Shell) is a cryptographic network protocol that enables secure remote management and operation of network devices, including routers and switches. SSH encrypts traffic, making it more secure than alternatives like Telnet, which sends data in plaintext. The document states:

“SSH (Secure Shell) is the recommended protocol for secure, interactive remote management of network devices. It provides a secure channel over an unsecured network by encrypting the traffic between the administrator’s workstation and the managed device.”

The correct answer is Platform as a Service (PaaS). PaaS provides developers with a ready-to-use platform that includes runtime environments, developer tools, middleware, and database services. Developers can focus on writing code while the provider handles security patches, updates, and infrastructure management.

A. CaaS (Containers as a Service) focuses on deploying and managing containerized applications, not providing full developer platforms.

B. IaaS delivers virtual machines, storage, and networking, but administrators must install and maintain the OS, middleware, and updates.

D. SaaS provides end-user applications (e.g., email, CRM), not platforms for development.

By using PaaS, the developers can build applications quickly and cost-effectively without worrying about underlying infrastructure or system maintenance.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Cloud service models (IaaS, PaaS, SaaS, CaaS).

Once the theory has been tested and confirmed, the next step is to implement the solution based on the CompTIA troubleshooting model.

CompTIA Troubleshooting Model:

Identify the problem.

Establish a theory of probable cause.

Test the theory.

Establish a plan of action and implement the solution. ✅ (Correct step)

Verify full system functionality.

Document findings, actions, and outcomes.

Breakdown of Options:

A. Develop a theory – The theory has already been developed and tested.

B. Establish a plan of action – This happens before implementation, but since the issue is confirmed, it ' s time to act.

C. Implement the solution – Correct answer. The problem is confirmed, so the fix should be applied.

D. Document the findings – Documentation is the final step, not the next one.

DHCP Options: DHCP options allow additional configuration parameters, such as the address of a TFTP server, to be provided to clients during the DHCP lease process. This is essential for VoIP phones to locate the server for configuration files.

Exclusions (A): Prevents certain IP addresses from being assigned by DHCP but does not direct devices to servers.

Lease time (B): Determines how long an IP address is assigned but does not impact TFTP settings.

Scope (D): Defines a range of IP addresses but does not include additional server information.

When installing multiple Power over Ethernet (PoE) devices like security cameras, it is crucial to ensure that the total power requirement does not exceed the power budget of the PoE switch. Each PoE switch has a maximum power capacity, and exceeding this capacity can cause some devices to fail to receive power.

PoE Standards: PoE switches conform to standards such as IEEE 802.3af (PoE) and 802.3at (PoE+), each with specific power limits per port and total power capacity.

Power Calculation: Adding up the power requirements of all connected PoE devices can help determine if the total power budget of the switch is exceeded.

Symptoms: When the power budget is exceeded, some devices, typically those farthest from the switch or connected last, may not power up or function correctly.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Covers PoE standards and troubleshooting power issues.

Cisco Networking Academy: Discusses PoE technologies, power budgeting, and managing PoE devices.

Network+ Certification All-in-One Exam Guide: Provides information on PoE setup, including power budget considerations.

Security Assertion Markup Language (SAML) is an XML-based standard used for exchanging authentication and authorization data between parties, particularly between an identity provider (IdP) and a service provider (SP). SAML is commonly used in Single Sign-On (SSO) solutions to pass sensitive user information, such as login credentials and attributes, securely between the identity provider and the service provider.

SAML (Security Assertion Markup Language): Facilitates web-based authentication and authorization, allowing users to access multiple services with a single set of credentials.

XML-based: Uses XML to encode the authentication and authorization data, ensuring secure transmission of user information.

Identity Federation: Enables secure sharing of identity information across different security domains, making it ideal for enterprise SSO solutions.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Covers authentication protocols, including SAML.

Cisco Networking Academy: Provides training on identity management and federation technologies.

Network+ Certification All-in-One Exam Guide: Explains SAML and its role in secure identity management and SSO.

Fiber connections require Tx on one end to connect to Rx on the other end. If the patch cord is replaced and link lights remain off, the most common cause is that the connectors are reversed. Swapping (transposing) the connectors ensures proper transmit/receive alignment.

A. Replacing the transceiver may eventually be necessary, but only after verifying correct connections.

B. Restarting the switchport won’t resolve a physical misconnection.

D. Using multimode fiber would be incorrect here, as the link was designed for single-mode (10 miles/16 km requires SMF).

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Fiber connectivity, Tx/Rx alignment, link light diagnostics.

The netstat command provides information about network connections, routing tables, interface statistics, masquerade connections, and multicast memberships. Running netstat on the server can help the administrator verify that the web server process is listening on the expected port (e.g., port 80 for HTTP or port 443 for HTTPS) and that there are no issues with network connections. This is a crucial first step in diagnosing why the web server is not accessible via a browser.References: CompTIA Network+ study materials. ​

The correct metric is RTO (Recovery Time Objective). RTO defines the maximum acceptable time to restore services after a disruption, ensuring business continuity. For example, if the RTO is 4 hours, systems must be back online within that timeframe after an outage.

B. MTBF (Mean Time Between Failures) measures reliability by calculating the average time between hardware failures.

C. RPO (Recovery Point Objective) defines how much data loss (in terms of time, such as last backup point) is acceptable.

D. MTTR (Mean Time to Repair) measures the average time taken to fix a failure but is not a predefined business requirement like RTO.

Organizations define RTOs during disaster recovery planning to align IT recovery capabilities with business needs.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Business continuity metrics (RTO, RPO, MTBF, MTTR).

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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