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CompTIA N10-009 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Networking Concepts: For network administrators and IT support professionals, this domain covers
トピック 2	Network Implementation: For network technicians and junior network engineers, this section covers Characteristics of routing technologies, Configuration of switching technologies and features, and
トピック 3	Selection and configuration of wireless devices.
トピック 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.\| 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.
トピック 5	Cloud concepts and connectivity options, and Common networking ports.
トピック 6	OSI reference model concepts, Comparison of networking appliances, applications, and functions

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CompTIA Network+ Certification Exam 認定 N10-009 試験問題 (Q36-Q41):

質問 # 36
A company recently converted most of the officelaptops to connect wirelesslyto the corporate network. After ahigh-traffic malware attack, narrowing the event to a specific user wasdifficultbecause of thewireless configuration.
Which of the following actions should the company take?

A. Migrate from PSK to Enterprise.
B. Restrict users to the 5GHz frequency.
C. Implement WPA2 encryption.
D. Upgrade to a mesh network.

正解：A

解説：
Comprehensive and Detailed Explanation:
UsingPre-Shared Key (PSK)authentication means thatall users share the same Wi-Fi password, making it difficult toidentify individual userswhen security incidents occur.
Migrating toWPA2-Enterprise(orWPA3-Enterprise) replacesPSK authenticationwithindividual user credentialsusing802.1X authentication and a RADIUS server. This allows the organization to:
* Track and log specific user activity
* Enforce per-user authentication policies
* Improve network security
Breakdown of Options:
* A. Restrict users to the 5GHz frequency- Improvesperformancebut doesnot enhance user tracking or security.
* B. Upgrade to a mesh network- Amesh network improves coverage,not security tracking.
* C. Migrate from PSK to Enterprise-#Correct answer.WPA2-Enterprise or WPA3-Enterprise uses individual user authentication,allowing per-user tracking.
* D. Implement WPA2 encryption-WPA2 is already widely used; itdoes not resolve the tracking issue.

質問 # 37
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. 255.255.0.0
B. 255.255.255.0
C. 255.255.254.0
D. 255.255.255.128

正解：D

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 # 38
A small company has the following IP addressing strategy:

A user is unable to connect to the company fileshare server located at 192.168.10.1. The user's networking configuration is:

Which of the following will most likely correct the issue?

A. Changing the DNS servers to internet IPs
B. Changing the IPv4 address to 192.168.10.1
C. Changing the subnet mask to 255.255.255.0
D. Changing the physical address to 7A-01-7A-21-01-50

正解：C

解説：
If the usercannot communicatewith192.168.10.1, they might be on adifferent subnet.Changing the subnet mask to 255.255.255.0ensures the user and the file server arein the same subnet.
Breakdown of Options:
* A. Changing the IPv4 address to 192.168.10.1- This wouldconflictwith the server's IP.
* B. Changing the subnet mask to 255.255.255.0-#Correct answer.Ensuresboth the user and the serverare on thesame subnet.
* C. Changing the DNS servers- DNS doesnot affect local network connectivity.
* D. Changing the physical address- TheMAC addressdoesnot impact subnet communication.

質問 # 39
Which of the following network devices converts wireless signals to electronic signals?

A. Firewall
B. Load balancer
C. Router
D. Access point

正解：D

解説：
* Role of an Access Point (AP):
* Wireless to Wired Conversion: An access point (AP) is a device that allows wireless devices to connect to a wired network using Wi-Fi. It converts wireless signals (radio waves) into electronic signals that can be understood by wired network devices.
* Functionality:
* Signal Conversion: The AP receives wireless signals from devices such as laptops, smartphones, and tablets, converts them into electronic signals, and transmits them over the wired network.
* Connectivity: APs provide a bridge between wireless and wired segments of the network, enabling seamless communication.
* Comparison with Other Devices:
* Router: Directs traffic between different networks and may include built-in AP functionality but is not primarily responsible for converting wireless to electronic signals.
* Firewall: Protects the network by controlling incoming and outgoing traffic based on security rules, not involved in signal conversion.
* Load Balancer: Distributes network or application traffic across multiple servers to ensure
* reliability and performance, not involved in signal conversion.
* Deployment:
* APs are commonly used in environments where wireless connectivity is needed, such as offices, homes, and public spaces. They enhance mobility and provide flexible network access.
References:
* CompTIA Network+ study materials on wireless networking and access points.

質問 # 40
Which of the following steps of the troubleshooting methodology would most likely include checking through each level of the OSI model after the problem has been identified?

A. Establish a theory.
B. Implement the solution.
C. Verify functionality.
D. Create a plan of action.

正解：C

解説：
Introduction to Troubleshooting Methodology:
Network troubleshooting involves a systematic approach to identifying and resolving network issues. The CompTIA Network+ certification emphasizes a structured troubleshooting methodology.
Troubleshooting Steps:
Identify the problem: Gather information, identify symptoms, and question users.
Establish a theory of probable cause: Consider possible reasons for the issue.
Test the theory to determine cause: Validate the theory with tests.
Establish a plan of action to resolve the problem and implement the solution: Create and execute a resolution plan.
Verify functionality and implement preventive measures: Ensure the solution works and prevent recurrence.
Verifying Functionality:
After implementing a solution, verifying functionality ensures that the problem is fully resolved. This involves testing the network to confirm that it operates correctly.
Checking through each level of the OSI model helps to ensure that all potential issues at different layers (physical, data link, network, transport, session, presentation, and application) are addressed.
Explanation of the Options:
A . Establish a theory: This step involves hypothesizing possible causes, not verifying functionality.
B . Implement the solution: This step involves executing the resolution plan.
C . Create a plan of action: This step involves planning the resolution, not verification.
D . Verify functionality: This step involves comprehensive checks, including OSI model layers, to ensure the issue is fully resolved.
Conclusion:
Verifying functionality is a critical step in the troubleshooting process, ensuring that the network operates correctly after a solution is implemented. It involves thorough testing across all OSI model layers.
Reference:
CompTIA Network+ guide explaining the troubleshooting methodology and the importance of verifying functionality (see page Ref 9†Basic Configuration Commands).

質問 # 41
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CompTIA N10-009合格問題: CompTIA Network+ Certification Exam - Tech4Exam無料デモをダウンロードする

CompTIA N10-009 認定試験の出題範囲：

N10-009日本語問題集 & N10-009試験資料

CompTIA Network+ Certification Exam 認定 N10-009 試験問題 (Q36-Q41):

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