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CompTIA N10-009 Exam Questions
- Topic 1: Networking Concepts: For network administrators and IT support professionals, this domain covers OSI reference model concepts, Comparison of networking appliances, applications, and functions Cloud concepts and connectivity options, and Common networking ports.
- Topic 2: Network Implementation: For network technicians and junior network engineers, this section covers Characteristics of routing technologies, Configuration of switching technologies and features, and Selection and configuration of wireless devices.
- Topic 3: Network Operations: For IT operations staff and network operations center (NOC) technicians, this part of the exam covers the purpose of organizational processes and procedures and use of network monitoring technologies.
- Topic 4: Network Security: This section of the exam for cybersecurity specialists and network security administrators covers the importance of basic network security concepts, Various types of attacks and their impact on the network, application of network security features, defense techniques, and solutions.
- Topic 5: Network Troubleshooting: For help desk technicians and network support specialists, this section covers troubleshooting methodology, troubleshooting common cabling and physical interface issues, troubleshooting common issues with network services, and use of appropriate tools or protocols to solve networking issues.
Free CompTIA N10-009 Exam Actual Questions
Note: Premium Questions for N10-009 were last updated On May. 08, 2026 (see below)
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)
Which of the following routing technologies uses an attribute list for path selection?
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.''
Which of the following physical installation factors is the most important when a network switch is installed in a sealed enclosure?
Switches in sealed enclosures are at risk of overheating because airflow is restricted. The temperature factor is critical since heat buildup can damage components, shorten device lifespan, and cause outages. Proper cooling or ventilation must be ensured.
A . Fire suppression is important for data centers but not the primary concern in a sealed box.
B . Power budget applies to PoE allocations, not environmental safety.
D . Humidity matters, but overheating is far more immediate in sealed environments.
Reference (CompTIA Network+ N10-009):
Domain: Network Infrastructure --- Environmental considerations, switch installation, temperature control.
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