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CompTIA N10-009 Exam Questions
Free CompTIA N10-009 Exam Actual Questions
Note: Premium Questions for N10-009 were last updated On May. 22, 2026 (see below)
Which of the following should a network engineer check to verify that updates are still being released for a device?
The correct answer is B. EOL documentation. If a network engineer wants to confirm whether a device is still receiving updates, patches, or vendor support, the first thing to review is the vendor's End-of-Life (EOL) and often related End-of-Support (EOS) documentation. These documents show whether the device is still actively supported, whether firmware and security updates are still being issued, and when that support is scheduled to stop.
This is important in network operations because devices that are no longer supported can become security risks and operational liabilities. Once a vendor declares a product end-of-life or end-of-support, future bug fixes, feature releases, and security updates may no longer be available. That directly affects patch management, lifecycle planning, and risk assessment.
The other choices do not answer the question as directly. A baseline configuration shows the intended device settings, not the support status. Asset inventory licensing helps track ownership, software entitlements, or subscriptions, but it does not prove that updates are still being released. Software development life cycle refers to the process of building software, not the support state of a deployed network device.
For Network+ exam purposes, when the question asks whether updates are still being released, the best source is the vendor's EOL documentation.
A company is opening a new site that needs to be divided into subnets that accommodate 75 hosts each. Which of the following is the most efficient subnet?
To support 75 hosts per subnet, you must choose a subnet size that provides at least 75 usable IP addresses. In IPv4, usable hosts per subnet equals 2^(host bits) 2 (subtracting network and broadcast). A /25 leaves 7 host bits (32--25 = 7), giving 2^7 2 = 128 2 = 126 usable hosts, which meets the requirement and is the smallest (most efficient) option listed that does so. A /26 leaves 6 host bits, giving 62 usable hosts, which is insufficient. A /27 gives 30 usable, and a /28 gives 14 usable, both far below 75. Network+ subnetting objectives emphasize selecting the smallest subnet that satisfies the host requirement to conserve address space while meeting growth and design constraints. Therefore, 192.168.13.0/25 is the most efficient option that accommodates at least 75 hosts per subnet.
A customer calls the help desk to report that resources are no longer reachable. The resources were available before network changes were made. The technician verifies the report, investigates, and discovers that a new logical layout is segmenting the network using tagging. Which of the following appliances most likely needs to be reviewed to restore the connections?
The correct answer is Switch because the question references a new logical layout segmenting the network using tagging, which indicates VLAN (Virtual Local Area Network) configuration. VLAN tagging (IEEE 802.1Q) is performed on switches to logically separate broadcast domains within the same physical infrastructure.
According to CompTIA Network+ (N10-009) objectives under switching technologies, VLANs are used to improve security, reduce broadcast traffic, and logically segment network traffic. When VLAN tagging is misconfigured---such as incorrect trunk ports, access port assignments, or mismatched VLAN IDs---devices may lose connectivity to required network resources.
Since the issue began after changes involving tagging, the most likely cause is an incorrect switch configuration, such as improper VLAN assignments or trunking settings.
An access point (Option A) may use VLANs for SSID segmentation, but core tagging configuration is handled at the switch. A firewall (Option B) filters traffic but does not control VLAN tagging at Layer 2 in typical deployments. A load balancer (Option D) distributes traffic among servers and is unrelated to VLAN segmentation.
Therefore, reviewing the switch configuration is the appropriate action to restore connectivity.
Which of the following steps of the troubleshooting methodology should a technician take to confirm a theory?
To confirm a theory in the troubleshooting process, the technician should duplicate (replicate) the problem under controlled conditions. In the Network+ (N10-009) methodology, confirming a theory means validating that the suspected cause actually produces the observed symptoms. Replicating the issue helps ensure the technician is not chasing a coincidence, and it allows changes to be tested safely (for example, reproducing the issue with a specific user account, endpoint, cable, port, SSID, or configuration). If the problem can be duplicated, the technician can then try targeted actions to see whether the symptoms change in predictable ways---strengthening or disproving the hypothesis.
The other choices occur earlier as part of forming the theory. Identify the symptoms is an initial step to define the problem clearly. Gather information is part of the discovery phase---collect logs, error messages, topology details, and user observations. Determine any changes is also an early step used to correlate recent modifications (patches, new devices, config changes) with the onset of the issue. Those steps help create a theory; duplication helps confirm it before implementing a full fix.
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Due to concerns around single points of failure, a company decided to add an additional WAN to the network. The company added a second MPLS vendor to the current MPLS WAN and deployed an additional WAN router at each site. Both MPLS providers use OSPF on the WAN network, and EIGRP is run internally. The first site to go live with the new WAN is successful, but when the second site is activated, significant network issues occur. Which of the following is the most likely cause for the WAN instability?
Asymmetrical routing occurs when packets take different paths to and from the destination, leading to instability in network communication. The use of two different MPLS providers with OSPF can lead to this type of routing issue, especially if the paths aren't carefully configured and managed. This can cause unexpected routing behaviors and instability in a dual-WAN setup. (Reference: CompTIA Network+ Study Guide, Chapter on Network Routing)
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