100%の合格率を試そう！更新されたのはN10-009試験問題 [2025]
合格させるN10-009試験にはリアル問題解答
質問 # 112
Which of the following network cables involves bounding light off of protective cladding?
- A. Multimode
- B. Coaxial
- C. Single-mode
- D. Twinaxial
正解：A
解説：
Multimode fiber optic cables involve the transmission of light signals that bounce off the core's cladding as they travel down the fiber. This characteristic differentiates it from single-mode fiber, where the light travels directly down the fiber without reflecting off the cladding. Here are some detailed points about multimode fiber cables:
Construction: Multimode fibers have a larger core diameter, typically 50 or 62.5 microns, compared to single-mode fibers, which have a core diameter of about 9 microns.
Light Propagation: The larger core of multimode fiber allows multiple light modes to propagate.
These modes travel at different angles, leading to reflections off the core-cladding boundary.
Distance and Bandwidth: Due to modal dispersion, where different light modes arrive at the receiver at different times, multimode fibers are suited for shorter distance applications compared to single-mode fibers. Typical distances are up to 550 meters for 10 Gbps Ethernet using OM4 multimode fiber.
Applications: Multimode fibers are commonly used in LANs (Local Area Networks), data centers, and for shorter distance data transmission due to their cost-effectiveness and ease of installation.
質問 # 113
A network administrator is planning to host a company application in the cloud, making the application available for all internal and third-party users. Which of the following concepts describes this arrangement?
- A. Multitenancy
- B. VPC
- C. NFV
- D. SaaS
正解：A
解説：
Multitenancy is a cloud computing architecture where a single instance of software serves multiple customers or tenants. Each tenant's data is isolated and remains invisible to other tenants. Hosting a company application in the cloud to be available for both internal and third- party users fits this concept, as it allows shared resources and infrastructure while maintaining data separation and security.
質問 # 114
After a company installed a new IPS, the network is experiencing speed degradation. A network administrator is troubleshooting the issue and runs a speed test. The results from the different network locations are as follows:
LocationSpeed DownSpeed Up
Wireless laptop4.8 Mbps47.1 Mbps
Wired desktop5.2 Mbps49.3 Mbps
Firewall48.8 Mbps49.5 Mbps
Which of the following is the most likely issue?
- A. Packet loss
- B. Network congestion
- C. Channel overlap
- D. Bottlenecking
正解：D
解説：
Bottlenecking occurs when a device in the network (such as an IPS) cannot process traffic efficiently, resulting in a dramatic drop in throughput. The significant difference between the firewall's speed (48.8 Mbps down) and the end-user devices' speeds (4.8 - 5.2 Mbps down) indicates a bottleneck caused by the IPS.
*Why not the other options?
*Packet loss (A) - Would typically cause connection timeouts, not just slow speeds.
*Channel overlap (C) - Affects only wireless networks, but the wired desktop is also experiencing slow speeds.
*Network congestion (D) - Would show fluctuations in both upload and download speeds, but upload speeds remain unaffected.
質問 # 115
An organization hasfour departmentsthat each need access todifferent resourcesthatdo not overlap. Which of the following should a technicianconfigurein order toimplement and assign an ACL?
- A. STP
- B. VLAN
- C. VPN
- D. DHCP
正解：B
解説：
Comprehensive and Detailed Explanation:
VLANs (Virtual Local Area Networks)segment network trafficby department, allowingACLs (Access Control Lists)to be appliedbased on VLAN membership, improving security and resource isolation.
Breakdown of Options:
* A. VLAN-Correct answer.VLANs enablelogical network segmentation, allowingACLs per department.
* B. DHCP- Assigns IP addresses butdoes not control access.
* C. VPN- Providesremote access,not segmentation within a network.
* D. STP- Preventsswitching loops,not related to ACL implementation.
質問 # 116
A research facility is expecting to see an exponential increase in global network traffic in the near future. The offices are equipped with 2.5Gbps fiber connections from the ISP, but the facility is currently only utilizing
1Gbps connections. Which of the following would need to be configured in order to use the ISP's connection speed?
- A. 802.1Q tagging
- B. Port duplex
- C. Link aggregation
- D. Network address translation
正解：C
解説：
* Understanding Link Aggregation:
* Definition:Link aggregation combines multiple network connections into a single logical link to increase bandwidth and provide redundancy.
* Usage in High-Bandwidth Scenarios:
* Combining Links:By aggregating multiple 1Gbps connections, the facility can utilize the full
2.5Gbps bandwidth provided by the ISP.
* Benefits:Enhanced throughput, load balancing, and redundancy, ensuring better utilization of available bandwidth.
* Comparison with Other Options:
* 802.1Q Tagging:Used for VLAN tagging, which does not affect the physical bandwidth utilization.
* Network Address Translation (NAT):Used for IP address translation, not related to link speed or bandwidth aggregation.
* Port Duplex:Refers to the mode of communication (full or half duplex) on a port, not the aggregation of bandwidth.
* Implementation:
* Configure link aggregation (often referred to as LACP - Link Aggregation Control Protocol) on network devices to combine multiple physical links into one logical link.
References:
* CompTIA Network+ study materials on network configuration and link aggregation.
質問 # 117
Which of the following is the correct order of components in a bottom-up approach for the three-tier hierarchical model?
- A. Core, spine, and leaf
- B. Access, core, and roof
- C. Access, distribution, and core
- D. Core, root, and distribution
正解：C
解説：
The three-tier hierarchical model in network design consists of three layers: access, distribution, and core. The access layer is where devices like PCs and printers connect to the network. The distribution layer aggregates the data received from the access layer switches before it is transmitted to the core layer, which is responsible for high-speed data transfer and routing. This approach improves scalability and performance in larger networks. References: CompTIA Network+ Exam Objectives and official study guides.
質問 # 118
Which of the following allows a user toconnect to an isolated deviceon astand-alone network?
- A. API gateway
- B. Jump box
- C. Secure Shell (SSH)
- D. Clientless VPN
正解：B
解説：
Comprehensive and Detailed Explanation:
Ajump boxis ahardened systemthat providessecure accessto isolated or sensitive devices on a separate network.
Breakdown of Options:
* A. Jump box-#Correct answer.Acts as amiddle point for secure remote access.
* B. API gateway- Used formanaging API calls,not remote access to isolated devices.
* C. Secure Shell (SSH)- Requiresdirect connectivity, whichmay not be availablefor anisolated device
.
* D. Clientless VPN-Allows web-based VPN access, but doesnot guarantee access to isolated devices.
質問 # 119
Two companies successfully merged. Following the merger, a network administrator identified a connection bottleneck. The newly formed company plans to acquire a high-end 40GB switch and redesign the network from a three-tier model to a collapsed core. Which of the following should the administrator do until the new devices are acquired?
- A. Implement the FHRP.
- B. Install a load balancer.
- C. Configure a route selection metric change.
- D. Enable link aggregation.
正解：D
解説：
*The issue described is a network bottleneck due to increased traffic after a merger.
*A collapsed core architecture consolidates the core and distribution layers into a single layer to improve efficiency and reduce latency.
*Until the 40GB switch is acquired, Link Aggregation (LAG) (IEEE 802.3ad / LACP) can be used to combine multiple physical links into a single logical link, increasing bandwidth and reducing bottlenecks.
*FHRP (First Hop Redundancy Protocol) (A) is used for gateway redundancy, not link aggregation.
*Route selection metric changes (B) help with routing decisions but don't address physical link congestion.
*Load balancers (C) distribute traffic for applications, not network links.
#Reference: CompTIA Network+ N10-009 Official Documentation - Network Architecture and Performance Optimization.
質問 # 120
Which of the following troubleshooting steps would provide a change advisory board with the information needed to make a decision?
- A. Establish a plan of action.
- B. Develop a theory of probable cause.
- C. Identify the problem.
- D. Test the theory to determine cause.
正解：A
解説：
Comprehensive and Detailed In-Depth Explanation:
A Change Advisory Board (CAB) reviews and approves network changes. Before approval, they need a detailed action plan outlining the change, potential impacts, and mitigation strategies.
* A Plan of Action includes risk assessments, rollback procedures, and deployment steps, which are critical for decision-making.
? Reference: CompTIA Network+ (N10-009) Official Study Guide - Section: Network Troubleshooting Methodologies
質問 # 121
A technician needs to identify a computer on the network that is reportedly downloading unauthorized content. Which of the following should the technician use?
- A. Packet capture
- B. Anomaly alerts
- C. Port mirroring
- D. Performance monitoring
正解：A
解説：
Packet Capture: This method captures and inspects network traffic to identify unauthorized downloads or malicious behavior. It provides detailed insight into the data being transmitted, making it the best tool for this scenario.
質問 # 122
A network technician is troubleshooting network latency and has determined the issue to be occuring two network switches( Switch10 and Switch11). Symptoms reported included poor video performance and slow file copying. Given the following informtion:
Which of the following should the technician most likely do to resolve the issue?
- A. Modify Switch10 MTU value to 1500.
- B. Configure STP on both switches.
- C. Change the native VLAN on the ports.
- D. Disable automatic negotiation on Switch11.
正解：A
質問 # 123
A technician is troubleshooting a computer issue for a user who works in a new annex of an office building.
The user is reporting slow speeds and intermittent connectivity. The computer is connected via a Cat 6 cable to a distribution switch that is 492ft (150m) away. Which of the following should the technician implement to correct the issue?
- A. Increase the bandwidth allocation to the computer.
- B. Install an access switch in the annex and run fiber to the distribution switch.
- C. Run a Cat 7 cable from the computer to the distribution switch.
- D. Enable the computer to support jumbo frames.
正解：B
解説：
The maximum recommended length for Ethernet cable runs is 100 meters (328 feet). At 150 meters, the Cat 6 cable is too long, causing signal degradation and connectivity issues. Running fiber from the distribution switch to an access switch in the annex will allow for reliable connectivity over longer distances, as fiber can cover greater distances without signal loss. (Reference: CompTIA Network+ Study Guide, Chapter on Network Cable Standards)
質問 # 124
Newly crimped 26ft (8m) STP Cat 6 patch cables were recently installed in one room to replace cables that were damaged by a vacuum cleaner. Now, users in that room are unable to connect to the network. A network technician tests the existing cables first. The 177ft (54m) cable that runs from the core switch to the access switch on the floor is working, as is the 115ft (35m) cable run from the access switch to the wall jack in the office. Which of the following is the most likely reason the users cannot connect to the network?
- A. An incorrect pinout on the patch cable is being used.
- B. The cable distance is exceeded.
- C. The patch cables are not plenum rated.
- D. Mixed UTP and STP cables are being used.
正解：A
解説：
An incorrect pinout on the patch cable could prevent network connectivity due to mismatched wiring.
Even if the cables are the correct length and type, a pinout issue can cause continuity problems and prevent data transmission. Proper crimping with the correct pinout is essential for network cables to function. (Reference: CompTIA Network+ Study Guide, Chapter on Network Media and Topologies)
質問 # 125
SIMULATION
You have been tasked with setting up a wireless network in an office. The network will consist of 3 Access Points and a single switch. The network must meet the following parameters:
The SSIDs need to be configured as CorpNet with a key of S3cr3t!
The wireless signals should not interfere with each other
The subnet the Access Points and switch are on should only support 30 devices maximum The Access Points should be configured to only support TKIP clients at a maximum speed INSTRUCTONS Click on the wireless devices and review their information and adjust the settings of the access points to meet the given requirements.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
正解：
解説：
See explanation below.
Explanation:
On the first exhibit, the layout should be as follows
Exhibit 2 as follows
Access Point Name AP2
Exhibit 3 as follows
Access Point Name AP3
質問 # 126
A network engineer is designing a secure communication link between two sites. The entire data stream needs to remain confidential. Which of the following will achieve this goal?
- A. AH
- B. IKE
- C. GRE
- D. ESP
正解：D
質問 # 127
A network administrator wants to implement an authentication process for temporary access to an organization's network. Which of the following technologies would facilitate this process?
- A. WPA3
- B. Captive portal
- C. Ad hoc network
- D. Enterprise authentication
正解：B
解説：
A captive portal is a technology that facilitates the authentication process for temporary access to a network. It is commonly used in public Wi-Fi hotspots, hotels, airports, and other environments where temporary network access is provided. When users connect to the network, they are redirected to a captive portal page where they must authenticate or agree to terms and conditions before gaining access to the internet or other network resources.
質問 # 128
Which of the following requires network devices to be managed using a different set of IP addresses?
- A. Out of band
- B. Jump box
- C. Console
- D. Split tunnel
正解：A
解説：
Out-of-band (OOB) management refers to using a dedicated management network that is physically separate from the regular data network. This management network uses a different set of IP addresses to ensure that management traffic is isolated from user data traffic, providing a secure way to manage network devices even if the main network is down or compromised.References:CompTIA Network+ study materials.
質問 # 129
Which of the following should be configured so users can authenticate to a wireless network using company credentials?
- A. RADIUS
- B. MFA
- C. SAML
- D. SSO
正解：A
解説：
RADIUS (Remote Authentication Dial-In User Service) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service. RADIUS is often used to manage access to wireless networks, enabling users to authenticate with their company credentials, ensuring secure access to the network.
質問 # 130
A user notifies a network administrator about losing access to a remote file server. The network administrator is able to ping the server and verifies the current firewall rules do not block access to the network fileshare. Which of the following tools wold help identify which ports are open on the remote file server?
- A. Nmap
- B. Tracert
- C. Dig
- D. nslookup
正解：A
解説：
Nmap (Network Mapper) is a powerful network scanning tool used to discover hosts and services on a computer network. It can be used to identify which ports are open on a remote server, which can help diagnose access issues to services like a remote file server.
Port Scanning: Nmap can perform comprehensive port scans to determine which ports are open and what services are running on those ports.
Network Discovery: It provides detailed information about the host's operating system, service versions, and network configuration.
Security Audits: Besides troubleshooting, Nmap is also used for security auditing and identifying potential vulnerabilities.
質問 # 131
Which of the following appliances provides users with an extended footprint that allows connections from multiple devices within a designated WLAN?
- A. Switch
- B. Firewall
- C. Access point
- D. Router
正解：C
解説：
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.
質問 # 132
Which of the following is a characteristic of the application layer?
- A. It encrypts data in transit.
- B. It relies upon other layers for packet delivery.
OB. It checks independently for packet loss. - C. It performs address translation.
正解：B
解説：
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.
Reference:
CompTIA Network+ guide covering the OSI model and the specific roles and functions of each layer (see page Ref 10†How to Use Cisco Packet Tracer).
質問 # 133
SIMULATION
You have been tasked with setting up a wireless network in an office. The network will consist of 3 Access Points and a single switch. The network must meet the following parameters:
The SSIDs need to be configured as CorpNet with a key of S3cr3t!
The wireless signals should not interfere with each other
The subnet the Access Points and switch are on should only support 30 devices maximum The Access Points should be configured to only support TKIP clients at a maximum speed INSTRUCTONS Click on the wireless devices and review their information and adjust the settings of the access points to meet the given requirements.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
正解：
解説：
See explanation below.
Explanation:
On the first exhibit, the layout should be as follows
Exhibit 2 as follows
Access Point Name AP2
Exhibit 3 as follows
Access Point Name AP3
質問 # 134
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CompTIA N10-009 認定試験の出題範囲：
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