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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 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 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.

トピック 4

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 5

Selection and configuration of wireless devices.

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CompTIA Network+ Certification Exam 認定 N10-009 試験問題 (Q105-Q110):

質問 # 105
Which of the following steps in the troubleshooting methodology includes checking logs for recent changes?

A. Establish a plan of action.
B. Document the findings and outcomes.
C. Test the theory to determine cause.
D. Identify the problem.

正解：D

質問 # 106
Which of the following devices can operate in multiple layers of the OSI model?

A. Switch
B. Transceiver
C. Hub
D. Modem

正解：A

解説：
Understanding Switches:
Layer 2 (Data Link Layer): Traditional switches operate primarily at Layer 2, where they use MAC addresses to forward frames within a local network.
Layer 3 (Network Layer): Layer 3 switches, also known as multilayer switches, can perform routing functions using IP addresses to forward packets between different networks.
Capabilities of Multilayer Switches:
VLANs and Inter-VLAN Routing: Multilayer switches can handle VLAN (Virtual Local Area Network) configurations and perform inter-VLAN routing, enabling communication between different VLANs.
Routing Protocols: They can run routing protocols like OSPF (Open Shortest Path First) and EIGRP (Enhanced Interior Gateway Routing Protocol) to manage traffic between networks.
Comparison with Other Devices:
Hub: Operates only at Layer 1 (Physical Layer) and simply repeats incoming signals to all ports.
Transceiver: Also operates at Layer 1, converting electrical signals to optical signals and vice versa.
Modem: Primarily operates at Layer 1 and Layer 2, modulating and demodulating signals for transmission over different types of media.
Practical Application:
Multilayer switches are commonly used in enterprise networks to optimize performance and manage complex routing and switching requirements within a single device.
Reference:
CompTIA Network+ study materials on network devices and the OSI model.

質問 # 107
Which of the following offers the ability to manage access at the cloud VM instance?

A. Direct Connect
B. Security group
C. Network ACL
D. Internet gateway

正解：B

解説：
Security groups in cloud environments act as virtual firewalls for VM instances, controlling inbound and outbound traffic based on specified rules.
From Andrew Ramdayal's guide:
"Network security groups are used to control inbound and outbound traffic to cloud resources within a VPC. They act as a virtual firewall for associated instances..."

質問 # 108
A network engineer configures the network settings in a new server as follows:
IP address = 192.163.1.15
Subnet mask = 255.255.255.0
Gateway = 192.163.1.255
The server can reach other hosts on the same subnet successfully, but it cannot reach hosts on different subnets. Which of the following is most likely configured incorrectly?

A. Default route
B. IP address
C. Subnet mask
D. Gateway

正解：D

解説：
The default gateway for a network should be an IP address within the subnet, but not the broadcast address. In this case:
IP: 192.163.1.15
Subnet Mask: 255.255.255.0
This means the network range is: 192.163.1.0 - 192.163.1.255
192.163.1.255 is the broadcast address for this subnet, so it cannot be used as a gateway.
Hence, the device fails to communicate outside its subnet because it's trying to use a broadcast address as its gateway.
✅ The issue is clearly with the gateway configuration.

質問 # 109
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. Create a plan of action.
B. Establish a theory.
C. Implement the solution.
D. Verify functionality.

正解：B

解説：
The CompTIA troubleshooting methodology includes steps like identifying the problem, establishing a theory of probable cause, testing the theory, creating a plan of action, implementing the solution, verifying functionality, and documenting findings. Establishing a theory involves analyzing the problem and considering possible causes, often by systematically checking each level of the OSI model (Physical, Data Link, Network, etc.) to pinpoint the root cause.
Why not Implement the solution? This step involves applying the fix, not analyzing the OSI model.
Why not Create a plan of action? This step focuses on planning the solution, not diagnosing the cause.
Why not Verify functionality? This step confirms the solution worked, not analyzing the OSI model.
Reference:CompTIA Network+ N10-009 Objective 5.2: Explain the troubleshooting methodology. The CompTIA Network+ Study Guide (e.g., Chapter 13: Network Troubleshooting) details the troubleshooting steps, noting that establishing a theory often involves using the OSI model to systematically identify the cause of network issues.

質問 # 110
......

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