[2025年02月05日] N10-009のPDF問題とテストエンジンには172問があります
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CompTIA N10-009 認定試験の出題範囲：
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質問 # 99
Which of the following is a characteristic of the application layer?
- A. It performs address translation.
- B. It relies upon other layers for packet delivery.
OB. It checks independently for packet loss. - C. It encrypts data in transit.
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 # 100
A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email. Which of the following should the engineer have done to prevent the issue from occurring?
- A. Change the email client configuration to match the MX record.
- B. Update the NS record to reflect the IP address change.
- C. Perform a DNS zone transfer prior to the MX record change.
- D. Reduce the TTL record prior to the MX record change.
正解：D
解説：
* Understanding TTL (Time to Live):
* TTL is a value in a DNS record that tells how long that record should be cached by DNS servers and clients. A higher TTL value means that the record will be cached longer, reducing the load on the DNS server but delaying the propagation of changes.
* Impact of TTL on DNS Changes:
* When an MX record change is made, it may take time for the change to propagate across all DNS servers due to the TTL setting. If the TTL is high, old DNS information might still be cached, leading to email being directed to the old server.
* Best Practice Before Making DNS Changes:
* To ensure that changes to DNS records propagate quickly, it is recommended to reduce the TTL value to a lower value (such as 300 seconds or 5 minutes) well in advance of making the changes.
This ensures that any cached records will expire quickly, and the new records will be used sooner.
* Verification of DNS Changes:
* After reducing the TTL and making the change to the MX record, it is important to verify the propagation using tools likedigornslookup.
* Comparison with Other Options:
* Change the email client configuration to match the MX record:Email clients generally do not need to match the MX record directly; they usually connect to a specific mail server specified in their settings.
* Perform a DNS zone transfer prior to the MX record change:DNS zone transfers are used to replicate DNS records between DNS servers, but they are not related to the propagation of individual record changes.
* Update the NS record to reflect the IP address change:NS records specify the DNS servers for a domain and are not related to MX record changes.
References:
* CompTIA Network+ study materials and DNS best practices.
質問 # 101
Which of the following network cables involves bounding light off of protective cladding?
- A. Single-mode
- B. Twinaxial
- C. Multimode
- D. Coaxial
正解：C
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.
Network Reference:
CompTIA Network+ N10-007 Official Certification Guide, which covers fiber optic technologies, including the differences between multimode and single-mode fibers.
Cisco Networking Academy: Provides training materials and reference guides on the properties of different fiber optic cables.
Fiber Optic Association (FOA): A professional society dedicated to fiber optics, offering extensive information and certification on fiber optic technologies.
Multimode fibers are specifically designed for short-range communication with higher data rates and are typically used in environments like data centers, where high bandwidth over shorter distances is crucial. The reflections off the cladding, inherent to multimode fiber, facilitate this high-capacity communication.
質問 # 102
A company is hosting a secure that requires all connections to the server to be encrypted. A junior administrator needs to harded the web server. The following ports on the web server. The following ports on the web server are open:
Which of the following ports should be disabled?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
For a web server that requires all connections to be encrypted, port 80 (HTTP) should be disabled. Port 80 is used for unencrypted web traffic, whereas port 443 is used for HTTPS, which provides encrypted communication.
* Port 80 (HTTP): This port is used for unsecured web traffic. Disabling this port ensures that all web traffic must use HTTPS, which encrypts the data in transit.
* Port 443 (HTTPS): This port is used for secure web traffic via SSL/TLS encryption. Keeping this port open ensures that secure connections can be made to the web server.
* Other Ports:
* Port 22: Used for SSH, providing secure remote access and file transfers.
* Port 587: Used for secure email submission (SMTP) with encryption.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Discusses the roles and security implications of various ports and protocols.
* Cisco Networking Academy: Provides training on secure web server configuration and port management.
* Network+ Certification All-in-One Exam Guide: Covers port security and best practices for securing web servers.
質問 # 103
Which of the following does a full-tunnel VPN provide?
- A. Access to blocked sites
- B. Lower bandwidth requirements
- C. Corporate Inspection of all networktraffic
- D. The ability to reset local computer passwords
正解：C
解説：
A full-tunnel VPN routes all of a user's network traffic through the corporate network. This means that the organization can inspect all network traffic for security and compliance purposes, as all data is tunneled through the VPN, allowing for comprehensive monitoring and inspection.References:CompTIA Network+ study materials.
質問 # 104
A network administrator is notified that a user cannot access resources on the network. The network administrator checks the physical connections to the workstation labeled User 3 and sees the Ethernet is properly connected. However, the network interface's indicator lights are not blinking on either the computer or the switch. Which of the following Is the most likely cause?
- A. The port Is shut down.
- B. The VLAN assignment is incorrect.
- C. The switch failed.
- D. The default gateway is wrong.
正解：A
解説：
When a network interface's indicator lights are not blinking on either the computer or the switch, it suggests a physical layer issue. Here is the detailed reasoning:
Ethernet Properly Connected: The Ethernet cable is correctly connected, eliminating issues related to a loose or faulty cable.
No Indicator Lights: The absence of blinking indicator lights on both the computer and the switch typically points to the port being administratively shut down.
Switch Port Shut Down: In networking, a switch port can be administratively shut down, disabling it from passing any traffic. This state is configured by network administrators and can be verified and changed using the command-line interface (CLI) of the switch.
Command to Check and Enable Port:
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Switch> enable
Switch# configure terminal
Switch(config)# interface [interface id]
Switch(config-if)# no shutdown
The command no shutdown re-enables the interface if it was previously disabled. This will restore the link and the indicator lights should start blinking, showing activity.
質問 # 105
Which of the following connectors provides console access to a switch?
- A. RJ45
- B. ST
- C. BNC
- D. SFP
正解：A
解説：
* Console Access:
* Purpose: Console access to a switch allows administrators to configure and manage the device directly. This is typically done using a terminal emulator program on a computer.
* RJ45 Connector:
* Common Use: The RJ45 connector is widely used for Ethernet cables and also for console connections to network devices like switches and routers.
* Console Cables: Console cables often have an RJ45 connector on one end (for the switch) and a DB9 serial connector on the other end (for the computer).
* Comparison with Other Connectors:
* ST (Straight Tip): A fiber optic connector used for networking, not for console access.
* BNC (Bayonet Neill-Concelman): A connector used for coaxial cable, typically in older network setups and not for console access.
* SFP (Small Form-factor Pluggable): A modular transceiver used for network interfaces, not for console access.
* Practical Application:
* Connection Process: Connect the RJ45 end of the console cable to the console port of the switch. Connect the DB9 end (or USB via adapter) to the computer. Use a terminal emulator (e.
g., PuTTY, Tera Term) to access the switch's command-line interface (CLI).
References:
* CompTIA Network+ study materials on network devices and connectors.
質問 # 106
A network administrator needs to divide 192.168.1.0/24 into two equal halves. Which of the following subnet masks should the administrator use?
- A. 255.255.254.0
- B. 255.255.255.0
- C. 255.255.255.128
- D. 255.255.0.0
正解：C
解説：
* Understanding Subnetting:
* Original Network:192.168.1.0/24 has a subnet mask of 255.255.255.0, which allows for 256 IP addresses (including network and broadcast addresses).
* Objective:Divide this network into two equal subnets.
* Calculating Subnet Mask:
* New Subnet Mask:To divide 192.168.1.0/24 into two equal halves, we need to borrow one bit from the host portion of the address, changing the subnet mask to 255.255.255.128 (/25).
* Subnet Breakdown:
* First Subnet: 192.168.1.0/25 (192.168.1.0 - 192.168.1.127)
* Second Subnet: 192.168.1.128/25 (192.168.1.128 - 192.168.1.255)
* Verification:
* Each subnet now has 128 IP addresses (126 usable IP addresses, excluding the network and broadcast addresses).
* Comparison with Other Options:
* 255.255.0.0 (/16):Provides a much larger network, not dividing the original /24 network.
* 255.255.254.0 (/23):Also creates a larger subnet, encompassing more than the original /24 network.
* 255.255.255.0 (/24):Maintains the original subnet size, not dividing it.
References:
* CompTIA Network+ study materials on subnetting and IP addressing.
質問 # 107
A network administrator wants to configure a backup route in case the primary route fails. A dynamic routing protocol is not installed on the router. Which of the following routing features should the administrator choose to accomplish this task?
- A. Administrative distance
- B. Neighbor adjacency
- C. Hop count
- D. Link state flooding
正解：A
解説：
Introduction to Administrative Distance
Administrative distance (AD) is a value used by routers to rank routes from different routing protocols. AD represents the trustworthiness of the source of the route. Lower AD values are more preferred. If a router has multiple routes to a destination from different sources, it will choose the route with the lowest AD.
Static Routes and Backup Routes
When a dynamic routing protocol is not used, static routes can be employed. Static routes are manually configured routes. To ensure a backup route, multiple static routes to the same destination can be configured with different AD values.
Configuring Static Routes with Administrative Distance
The primary route is configured with a lower AD value, making it the preferred route. The backup route is configured with a higher AD value. In the event of the primary route failure, the router will then use the backup route.
Example Configuration:
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ip route 192.168.1.0 255.255.255.0 10.0.0.1 1
ip route 192.168.1.0 255.255.255.0 10.0.0.2 10
In the above example, 192.168.1.0/24 is the destination network.
10.0.0.1 is the next-hop IP address for the primary route with an AD of 1.
10.0.0.2 is the next-hop IP address for the backup route with an AD of 10.
Verification:
After configuration, use the show ip route command to verify that the primary route is in use and the backup route is listed as a candidate for use if the primary route fails.
Reference:
CompTIA Network+ guide explains the concept of administrative distance and its use in static routing configuration (see page Ref 9fasic Configuration Commands).
質問 # 108
A network technician needs to resolve some issues with a customer's SOHO network.
The customer reports that some of the devices are not connecting to the network, while others appear to work as intended.
INSTRUCTIONS
Troubleshoot all the network components and review the cable test results by Clicking on each device and cable.
Diagnose the appropriate component(s) by identifying any components with a problem and recommend a solution to correct each problem.
Cable Test Results:
Cable 1:
Cable 2:
Cable 3:
Cable 4:
正解：
解説：
See the Explanation for detailed information on this simulation.
Explanation:
(Note: Ips will be change on each simulation task, so we have given example answer for the understanding) To troubleshoot all the network components and review the cable test results, you can use the following steps:
* Click on each device and cable to open its information window.
* Review the information and identify any problems or errors that may affect the network connectivity or
* performance.
* Diagnose the appropriate component(s) by identifying any components with a problem and recommend a solution to correct each problem.
* Fill in the remediation form using the drop-down menus provided.
Here is an example of how to fill in the remediation form for PC1:
* The component with a problem is PC1.
* The problem is Incorrect IP address.
* The solution is Change the IP address to 192.168.1.10.
You can use the same steps to fill in the remediation form for other components.
To enter commands in each device, you can use the following steps:
* Click on the device to open its terminal window.
* Enter the command ipconfig /all to display the IP configuration of the device, including its IP address, subnet mask, default gateway, and DNS servers.
* Enter the command ping <IP address> to test the connectivity and reachability to another device on the network by sending and receiving echo packets. Replace <IP address> with the IP address of the destination device, such as 192.168.1.1 for Core Switch 1.
* Enter the command tracert <IP address> to trace the route and measure the latency of packets from the device to another device on the network by sending and receiving packets with increasing TTL values.
Replace <IP address> with the IP address of the destination device, such as 192.168.1.1 for Core Switch
1.
Here is an example of how to enter commands in PC1:
* Click on PC1 to open its terminal window.
* Enter the command ipconfig /all to display the IP configuration of PC1. You should see that PC1 has an incorrect IP address of 192.168.2.10, which belongs to VLAN 2 instead of VLAN 1.
* Enter the command ping 192.168.1.1 to test the connectivity to Core Switch 1. You should see that PC1 is unable to ping Core Switch 1 because they are on different subnets.
* Enter the command tracert 192.168.1.1 to trace the route to Core Switch 1. You should see that PC1 is unable to reach Core Switch 1 because there is no route between them.
You can use the same steps to enter commands in other devices, such as PC3, PC4, PC5, and Server 1.
質問 # 109
Which of the following best explains the role of confidentiality with regard to data at rest?
- A. Datacanbe accessedafter verifying the hash.
- B. Datacanbe accessedby anyone on the administrative network.
- C. Datacanbe accessedafter privileged access Is granted.
- D. Datacanbe accessedremotely with proper training.
正解：C
解説：
* Confidentiality with Data at Rest: Confidentiality is a core principle of data security, ensuring that data stored (at rest) is only accessible to authorized individuals. This protection is achieved through mechanisms such as encryption, access controls, and permissions.
* Privileged Access: The statement "Data can be accessed after privileged access is granted" aligns with the confidentiality principle, as it restricts data access to users who have been granted specific permissions or roles. Only those with the appropriate credentials or permissions can access the data.
* Incorrect Options:
* A. "Data can be accessed by anyone on the administrative network." This violates the principle of confidentiality by allowing unrestricted access.
* B. "Data can be accessed remotely with proper training." This focuses on remote access rather than restricting access based on privileges.
* D. "Data can be accessed after verifying the hash." This option relates more to data integrity rather than confidentiality.
質問 # 110
A network administrator is configuring a new switch and wants to ensure that only assigned devices can connect to the switch. Which of the following should the administrator do?
- A. Implement a captive portal.
- B. Configure ACLs.
- C. Enable port security.
- D. Disable unnecessary services.
正解：C
解説：
To ensure that only assigned devices can connect to a switch, the network administrator should enable port security. Port security restricts port access based on MAC addresses, allowing only pre-configured devices to connect to the network. This helps prevent unauthorized devices from gaining access to the network. Other options like configuring ACLs, implementing a captive portal, or disabling unnecessary services serve different security purposes and do not directly restrict physical port access based on device identity.
Reference: CompTIA Network+ Certification Exam Objectives - Network Security section.
質問 # 111
Which of the following network topologies contains a direct connection between every node in the network?
- A. Point-to-point
- B. Mesh
- C. Hub-and-spoke
- D. Star
正解：B
解説：
In a mesh topology, every node is directly connected to every other node. This provides high redundancy and reliability, as there are multiple paths for data to travel between nodes. This topology is often used in networks where high availability is crucial.References:CompTIA Network+ study materials.
質問 # 112
An organizatin is struggling to get effective coverage using the wireless network. The organization wants to implement a solution that will allow for continous connectivity anywhere in the facility. Which of the following should the network administ rator suggest to ensure the best coverage?
- A. Implementing additional ad hoc access points
- B. Providing more Ethernet drops for user connections
- C. nl Changing the current frequency of the WI-FI
- D. Deploying a mesh network in the building
正解：D
質問 # 113
Which of the following is a cost-effective advantage of a split-tunnel VPN?
- A. Cloud-based traffic flows outside of the company's network.
- B. Monitoring detects insecure machines on the company's network.
- C. Web traffic is filtered through a web filter.
- D. More bandwidth is required on the company's internet connection.
正解：A
解説：
A split-tunnel VPN allows some traffic to be routed through the VPN while other traffic goes directly to the internet. This setup offers several advantages, with a primary one being cost-effectiveness due to cloud-based traffic not consuming company bandwidth.
* Bandwidth Utilization: Split-tunnel VPNs reduce the amount of traffic passing through the company's network, freeing up bandwidth for other uses.
* Performance: By allowing internet-bound traffic to bypass the VPN, it can reduce latency and improve the performance for users accessing cloud services directly.
* Cost Savings: Reduced load on the company's VPN infrastructure can lead to lower costs in terms of both hardware and bandwidth.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Covers VPN types, including split-tunnel configurations and their advantages.
* Cisco Networking Academy: Discusses VPN technologies and the benefits of split-tunneling.
* Network+ Certification All-in-One Exam Guide: Provides detailed information on VPN setups, including the cost-effectiveness of split-tunnel VPNs.
By allowing cloud-based traffic to flow outside the company's network, a split-tunnel VPN optimizes resource usage and enhances the overall network performance without incurring extra costs for bandwidth.
質問 # 114
As part of an attack, a threat actor purposefully overflows the content-addressable memory (CAM) table on a switch. Which of the following types of attacks is this scenario an example of?
- A. DNS poisoning
- B. MAC flooding
- C. ARP spoofing
- D. Evil twin
正解：B
解説：
Definition of MAC Flooding:
MAC flooding is an attack where a malicious actor sends numerous fake MAC addresses to a switch, overwhelming its CAM table. The CAM table stores MAC addresses and their associated ports for efficient traffic forwarding.
Impact of MAC Flooding:
CAM Table Overflow: When the CAM table is full, the switch cannot learn new MAC addresses and is forced to broadcast traffic to all ports, leading to a degraded network performance and potential data interception.
Switch Behavior: The switch operates in a fail-open mode, treating the network as a hub, which can be exploited for eavesdropping on traffic.
Comparison with Other Attacks:
ARP Spoofing: Involves sending false ARP (Address Resolution Protocol) messages to associate the attacker's MAC address with the IP address of another device.
Evil Twin: Involves creating a rogue wireless access point that mimics a legitimate one to intercept data.
DNS Poisoning: Involves corrupting the DNS cache with false information to redirect traffic to malicious sites.
Preventive Measures:
Port Security: Configure port security on switches to limit the number of MAC addresses per port, preventing CAM table overflow.
Network Segmentation: Use VLANs to segment network traffic and limit the impact of such attacks.
Reference:
CompTIA Network+ study materials on network security threats and mitigation techniques.
質問 # 115
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