Practice Free N10-009 Exam Online Questions
Question #131
A user called the help desk after business hours to complain that files on a device are inaccessible and the wallpaper was changed. The network administrator thinks that this issue is an isolated incident, but the security analyst thinks the issue might be a ransomware attack.
Which of the following troubleshooting steps should be taken first?
- A . Identify the problem
- B . Establish a theory
- C . Document findings
- D . Create a plan of action
Correct Answer: A
A
Explanation:
The first step in any troubleshooting process is to identify the problem. This includes gathering information from the user, reviewing logs, and observing the symptoms. In this case, identifying the scope and nature of the issue (e.g., signs of ransomware) is critical before forming any theories or plans.
From Andrew Ramdayal’s guide:
“The troubleshooting methodology begins with identifying the problem. This step involves questioning users, identifying user changes, and determining the symptoms.”
A
Explanation:
The first step in any troubleshooting process is to identify the problem. This includes gathering information from the user, reviewing logs, and observing the symptoms. In this case, identifying the scope and nature of the issue (e.g., signs of ransomware) is critical before forming any theories or plans.
From Andrew Ramdayal’s guide:
“The troubleshooting methodology begins with identifying the problem. This step involves questioning users, identifying user changes, and determining the symptoms.”
Question #132
A network administrator notices interference with industrial equipment in the 2.4GHz range.
Which of the following technologies would most likely mitigate this issue? (Select two).
- A . Mesh network
- B . 5GHz frequency
- C . Omnidirectional antenna
- D . Non-overlapping channel
- E . Captive portal
- F . Ad hoc network
Correct Answer: B
B
Explanation:
Understanding 2.4GHz Interference:
The 2.4GHz frequency range is commonly used by many devices, including Wi-Fi, Bluetooth, and various industrial equipment. This can lead to interference and degraded performance.
Mitigation Strategies:
5GHz Frequency:
The 5GHz frequency band offers more channels and less interference compared to the 2.4GHz band. Devices operating on 5GHz are less likely to encounter interference from other devices, including industrial equipment.
Non-overlapping Channels:
In the 2.4GHz band, using non-overlapping channels (such as channels 1, 6, and 11) can help reduce interference. Non-overlapping channels do not interfere with each other, providing clearer communication paths for Wi-Fi signals.
Why Other Options are Less Effective:
Mesh Network: While useful for extending network coverage, a mesh network does not inherently address interference issues.
Omnidirectional Antenna: This type of antenna broadcasts signals in all directions but does not mitigate interference.
Captive Portal: A web page that users must view and interact with before accessing a network, unrelated to frequency interference.
Ad Hoc Network: A decentralized wireless network that does not address interference issues directly.
Implementation:
Switch Wi-Fi devices to the 5GHz band if supported by the network infrastructure and client devices.
Configure Wi-Fi access points to use non-overlapping channels within the 2.4GHz band to minimize interference.
Reference: CompTIA Network+ study materials on wireless networking and interference mitigation.
B
Explanation:
Understanding 2.4GHz Interference:
The 2.4GHz frequency range is commonly used by many devices, including Wi-Fi, Bluetooth, and various industrial equipment. This can lead to interference and degraded performance.
Mitigation Strategies:
5GHz Frequency:
The 5GHz frequency band offers more channels and less interference compared to the 2.4GHz band. Devices operating on 5GHz are less likely to encounter interference from other devices, including industrial equipment.
Non-overlapping Channels:
In the 2.4GHz band, using non-overlapping channels (such as channels 1, 6, and 11) can help reduce interference. Non-overlapping channels do not interfere with each other, providing clearer communication paths for Wi-Fi signals.
Why Other Options are Less Effective:
Mesh Network: While useful for extending network coverage, a mesh network does not inherently address interference issues.
Omnidirectional Antenna: This type of antenna broadcasts signals in all directions but does not mitigate interference.
Captive Portal: A web page that users must view and interact with before accessing a network, unrelated to frequency interference.
Ad Hoc Network: A decentralized wireless network that does not address interference issues directly.
Implementation:
Switch Wi-Fi devices to the 5GHz band if supported by the network infrastructure and client devices.
Configure Wi-Fi access points to use non-overlapping channels within the 2.4GHz band to minimize interference.
Reference: CompTIA Network+ study materials on wireless networking and interference mitigation.
Question #133
Which of the following is used to estimate the average life span of a device?
- A . RTO
- B . RPO
- C . MTBF
- D . MTTR
Correct Answer: C
C
Explanation:
Understanding MTBF:
Mean Time Between Failures (MTBF): A reliability metric that estimates the average time between successive failures of a device or system.
Calculation and Importance:
Calculation: MTBF is calculated as the total operational time divided by the number of failures during that period.
Usage: Used by manufacturers and engineers to predict the lifespan and reliability of a device, helping in maintenance planning and lifecycle management.
Comparison with Other Metrics:
RTO (Recovery Time Objective): The maximum acceptable time to restore a system after a failure.
RPO (Recovery Point Objective): The maximum acceptable amount of data loss measured in time.
MTTR (Mean Time to Repair): The average time required to repair a device or system and return it to operational status.
Application:
MTBF is crucial for planning maintenance schedules, spare parts inventory, and improving the overall reliability of systems.
Reference: CompTIA Network+ study materials on reliability and maintenance metrics.
C
Explanation:
Understanding MTBF:
Mean Time Between Failures (MTBF): A reliability metric that estimates the average time between successive failures of a device or system.
Calculation and Importance:
Calculation: MTBF is calculated as the total operational time divided by the number of failures during that period.
Usage: Used by manufacturers and engineers to predict the lifespan and reliability of a device, helping in maintenance planning and lifecycle management.
Comparison with Other Metrics:
RTO (Recovery Time Objective): The maximum acceptable time to restore a system after a failure.
RPO (Recovery Point Objective): The maximum acceptable amount of data loss measured in time.
MTTR (Mean Time to Repair): The average time required to repair a device or system and return it to operational status.
Application:
MTBF is crucial for planning maintenance schedules, spare parts inventory, and improving the overall reliability of systems.
Reference: CompTIA Network+ study materials on reliability and maintenance metrics.
Question #134
Which of the following most likely requires the use of subinterfaces?
- A . A router with only one available LAN port
- B . A firewall performing deep packet inspection
- C . A hub utilizing jumbo frames
- D . A switch using Spanning Tree Protocol
Correct Answer: A
A
Explanation:
Introduction to Subinterfaces:
Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface.
Use Case for Subinterfaces:
Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN.
This setup allows the router to route traffic between different VLANs.
Example Configuration:
Consider a router with a single physical interface GigabitEthernet0/0 and two VLANs, 10 and 20.
interface GigabitEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
!
interface GigabitEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.20.1 255.255.255.0
The encapsulation dot1Q command specifies the VLAN ID.
Explanation of the Options:
A
Explanation:
Introduction to Subinterfaces:
Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface.
Use Case for Subinterfaces:
Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN.
This setup allows the router to route traffic between different VLANs.
Example Configuration:
Consider a router with a single physical interface GigabitEthernet0/0 and two VLANs, 10 and 20.
interface GigabitEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
!
interface GigabitEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.20.1 255.255.255.0
The encapsulation dot1Q command specifies the VLAN ID.
Explanation of the Options:
Question #135
Which of the following layers of the OSI model is responsible for end-to-end encryption?
- A . Presentation
- B . Application
- C . Session
- D . Transport
Correct Answer: A
A
Explanation:
The correct answer is Presentation, which is Layer 6 of the OSI model. According to the CompTIA Network+ N10-009 objectives, the Presentation layer is responsible for data formatting, compression, and encryption, ensuring that data sent from the application layer of one system can be properly interpreted by the receiving system.
End-to-end encryption refers to encrypting data before transmission and decrypting it only at the final destination, preventing intermediaries from accessing the plaintext data. In the OSI model, this encryption and decryption function is logically placed at the Presentation layer, which sits between the Application and Session layers. This layer transforms data into a standardized format and applies security mechanisms such as encryption algorithms.
While modern implementations like TLS/SSL often operate across multiple layers in real-world networking stacks, the Network+ exam adheres to the conceptual OSI model when testing knowledge. From an OSI perspective, encryption is explicitly associated with the Presentation layer.
The Application layer provides network services to end-user applications, the Session layer manages session establishment and teardown, and the Transport layer focuses on segmentation, flow control, and reliability. None of these layers are primarily responsible for encryption within the OSI framework.
CompTIA emphasizes understanding these conceptual responsibilities, making Presentation the correct and expected answer.
A
Explanation:
The correct answer is Presentation, which is Layer 6 of the OSI model. According to the CompTIA Network+ N10-009 objectives, the Presentation layer is responsible for data formatting, compression, and encryption, ensuring that data sent from the application layer of one system can be properly interpreted by the receiving system.
End-to-end encryption refers to encrypting data before transmission and decrypting it only at the final destination, preventing intermediaries from accessing the plaintext data. In the OSI model, this encryption and decryption function is logically placed at the Presentation layer, which sits between the Application and Session layers. This layer transforms data into a standardized format and applies security mechanisms such as encryption algorithms.
While modern implementations like TLS/SSL often operate across multiple layers in real-world networking stacks, the Network+ exam adheres to the conceptual OSI model when testing knowledge. From an OSI perspective, encryption is explicitly associated with the Presentation layer.
The Application layer provides network services to end-user applications, the Session layer manages session establishment and teardown, and the Transport layer focuses on segmentation, flow control, and reliability. None of these layers are primarily responsible for encryption within the OSI framework.
CompTIA emphasizes understanding these conceptual responsibilities, making Presentation the correct and expected answer.
Question #136
Which of the following is enforced through legislation?
- A . AUP
- B . GDPR
- C . Code of conduct
- D . EULA
Correct Answer: B
B
Explanation:
GDPR (General Data Protection Regulation) is a legal framework enforced by the European Union to protect personal data and privacy. Unlike internal organizational policies such as AUPs or codes of conduct, GDPR is a legislated regulation, and organizations must comply or face legal consequences.
Reference: Section 4.1 C Basic Network Security Concepts C “GDPR and Compliance Regulations”
B
Explanation:
GDPR (General Data Protection Regulation) is a legal framework enforced by the European Union to protect personal data and privacy. Unlike internal organizational policies such as AUPs or codes of conduct, GDPR is a legislated regulation, and organizations must comply or face legal consequences.
Reference: Section 4.1 C Basic Network Security Concepts C “GDPR and Compliance Regulations”
Question #136
Which of the following is enforced through legislation?
- A . AUP
- B . GDPR
- C . Code of conduct
- D . EULA
Correct Answer: B
B
Explanation:
GDPR (General Data Protection Regulation) is a legal framework enforced by the European Union to protect personal data and privacy. Unlike internal organizational policies such as AUPs or codes of conduct, GDPR is a legislated regulation, and organizations must comply or face legal consequences.
Reference: Section 4.1 C Basic Network Security Concepts C “GDPR and Compliance Regulations”
B
Explanation:
GDPR (General Data Protection Regulation) is a legal framework enforced by the European Union to protect personal data and privacy. Unlike internal organizational policies such as AUPs or codes of conduct, GDPR is a legislated regulation, and organizations must comply or face legal consequences.
Reference: Section 4.1 C Basic Network Security Concepts C “GDPR and Compliance Regulations”
Question #138
Ten new laptops are added to an existing network, and they can only communicate with one another.
An administrator reviews documentation and sees the following:
Subnet: 10.8.100.1/24
Scope: 10.8.100.50 C 10.8.100.150
Reservation: 10.8.100.151 C 10.8.100.175
A technician scans the network and receives the following results:
IP addresses used: 10.8.100.45 C 10.8.100.175
Which of the following should be done to ensure connectivity on all laptops?
- A . Increase the scope to 10.8.100.35 C 10.8.100.150
- B . Increase the scope to 10.8.100.40 C 10.8.100.150
- C . Increase the scope to 10.8.100.40 C 10.8.100.175
- D . Increase the scope to 10.8.100.50 C 10.8.100.175
Correct Answer: D
D
Explanation:
The correct answer is D: Increase the scope to 10.8.100.50 C 10.8.100.175. According to the CompTIA Network+ N10-009 objectives, proper DHCP scope configuration is essential to ensure all hosts can obtain valid IP addresses and communicate beyond their local segment.
In this scenario, the DHCP scope is configured for 10.8.100.50 through 10.8.100.150, while a reservation range exists from 10.8.100.151 through 10.8.100.175. The network scan shows that IP addresses up to 10.8.100.175 are already in use. This indicates that some devices are either statically assigned addresses outside the active scope or are failing to receive valid DHCP leases, causing the new laptops to communicate only with each other―often a sign of APIPA or improper addressing.
To ensure full connectivity, the DHCP scope must be expanded to include the entire range of addresses that are actively in use, including the reserved addresses.
Option D correctly extends the scope to 10.8.100.175 without overlapping lower addresses that may be statically assigned or intentionally excluded.
The Network+ objectives emphasize avoiding address conflicts and ensuring DHCP scopes align with real-world network usage. Expanding the scope to include all valid addresses ensures that all laptops can obtain proper IP configuration, default gateway information, and full network connectivity.
D
Explanation:
The correct answer is D: Increase the scope to 10.8.100.50 C 10.8.100.175. According to the CompTIA Network+ N10-009 objectives, proper DHCP scope configuration is essential to ensure all hosts can obtain valid IP addresses and communicate beyond their local segment.
In this scenario, the DHCP scope is configured for 10.8.100.50 through 10.8.100.150, while a reservation range exists from 10.8.100.151 through 10.8.100.175. The network scan shows that IP addresses up to 10.8.100.175 are already in use. This indicates that some devices are either statically assigned addresses outside the active scope or are failing to receive valid DHCP leases, causing the new laptops to communicate only with each other―often a sign of APIPA or improper addressing.
To ensure full connectivity, the DHCP scope must be expanded to include the entire range of addresses that are actively in use, including the reserved addresses.
Option D correctly extends the scope to 10.8.100.175 without overlapping lower addresses that may be statically assigned or intentionally excluded.
The Network+ objectives emphasize avoiding address conflicts and ensuring DHCP scopes align with real-world network usage. Expanding the scope to include all valid addresses ensures that all laptops can obtain proper IP configuration, default gateway information, and full network connectivity.
Question #138
Ten new laptops are added to an existing network, and they can only communicate with one another.
An administrator reviews documentation and sees the following:
Subnet: 10.8.100.1/24
Scope: 10.8.100.50 C 10.8.100.150
Reservation: 10.8.100.151 C 10.8.100.175
A technician scans the network and receives the following results:
IP addresses used: 10.8.100.45 C 10.8.100.175
Which of the following should be done to ensure connectivity on all laptops?
- A . Increase the scope to 10.8.100.35 C 10.8.100.150
- B . Increase the scope to 10.8.100.40 C 10.8.100.150
- C . Increase the scope to 10.8.100.40 C 10.8.100.175
- D . Increase the scope to 10.8.100.50 C 10.8.100.175
Correct Answer: D
D
Explanation:
The correct answer is D: Increase the scope to 10.8.100.50 C 10.8.100.175. According to the CompTIA Network+ N10-009 objectives, proper DHCP scope configuration is essential to ensure all hosts can obtain valid IP addresses and communicate beyond their local segment.
In this scenario, the DHCP scope is configured for 10.8.100.50 through 10.8.100.150, while a reservation range exists from 10.8.100.151 through 10.8.100.175. The network scan shows that IP addresses up to 10.8.100.175 are already in use. This indicates that some devices are either statically assigned addresses outside the active scope or are failing to receive valid DHCP leases, causing the new laptops to communicate only with each other―often a sign of APIPA or improper addressing.
To ensure full connectivity, the DHCP scope must be expanded to include the entire range of addresses that are actively in use, including the reserved addresses.
Option D correctly extends the scope to 10.8.100.175 without overlapping lower addresses that may be statically assigned or intentionally excluded.
The Network+ objectives emphasize avoiding address conflicts and ensuring DHCP scopes align with real-world network usage. Expanding the scope to include all valid addresses ensures that all laptops can obtain proper IP configuration, default gateway information, and full network connectivity.
D
Explanation:
The correct answer is D: Increase the scope to 10.8.100.50 C 10.8.100.175. According to the CompTIA Network+ N10-009 objectives, proper DHCP scope configuration is essential to ensure all hosts can obtain valid IP addresses and communicate beyond their local segment.
In this scenario, the DHCP scope is configured for 10.8.100.50 through 10.8.100.150, while a reservation range exists from 10.8.100.151 through 10.8.100.175. The network scan shows that IP addresses up to 10.8.100.175 are already in use. This indicates that some devices are either statically assigned addresses outside the active scope or are failing to receive valid DHCP leases, causing the new laptops to communicate only with each other―often a sign of APIPA or improper addressing.
To ensure full connectivity, the DHCP scope must be expanded to include the entire range of addresses that are actively in use, including the reserved addresses.
Option D correctly extends the scope to 10.8.100.175 without overlapping lower addresses that may be statically assigned or intentionally excluded.
The Network+ objectives emphasize avoiding address conflicts and ensuring DHCP scopes align with real-world network usage. Expanding the scope to include all valid addresses ensures that all laptops can obtain proper IP configuration, default gateway information, and full network connectivity.
Question #140
A network administrator prepares a VLAN for a new office while planning for minimal IP address waste. The new office will have approximately 800 workstations.
Which of the following network schemes meets the requirements?
- A . 10.0.100.0/22
- B . 172.16.8.0/23
- C . 172.16.15.0/20
- D . 192.168.4.0/21
Correct Answer: A
A
Explanation:
To support about 800 workstations with minimal IP waste, you choose the smallest subnet that provides at least 800 usable host addresses. In IPv4, usable hosts per subnet are calculated as 2^(host bits) − 2 (subtracting network and broadcast addresses). A /22 leaves 10 host bits (32 − 22 = 10), providing 2^10 − 2 = 1024 − 2 = 1022 usable addresses―enough for 800 devices with relatively low waste.
Check the other options: /23 leaves 9 host bits, giving 2^9 − 2 = 512 − 2 = 510 usable addresses, which is not enough. A /21 provides 2^11 − 2 = 2048 − 2 = 2046 usable addresses―enough, but wastes more than /22. A /20 provides 2^12 − 2 = 4096 − 2 = 4094 usable addresses―much more waste.
Therefore, 10.0.100.0/22 is the best choice that meets the workstation requirement while minimizing unused addresses.
A
Explanation:
To support about 800 workstations with minimal IP waste, you choose the smallest subnet that provides at least 800 usable host addresses. In IPv4, usable hosts per subnet are calculated as 2^(host bits) − 2 (subtracting network and broadcast addresses). A /22 leaves 10 host bits (32 − 22 = 10), providing 2^10 − 2 = 1024 − 2 = 1022 usable addresses―enough for 800 devices with relatively low waste.
Check the other options: /23 leaves 9 host bits, giving 2^9 − 2 = 512 − 2 = 510 usable addresses, which is not enough. A /21 provides 2^11 − 2 = 2048 − 2 = 2046 usable addresses―enough, but wastes more than /22. A /20 provides 2^12 − 2 = 4096 − 2 = 4094 usable addresses―much more waste.
Therefore, 10.0.100.0/22 is the best choice that meets the workstation requirement while minimizing unused addresses.