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CompTIA Certification
N10-009 Exam
CompTIA.N10-009.v2026-04-15.q384 Dumps

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Question 246

A virtual machine has the following configuration:
*IPv4 address: 169.254.10.10
*Subnet mask: 255.255.0.0
The virtual machine can reach colocated systems but cannot reach external addresses on the Internet. Which of the following Is most likely the root cause?

A.Thesubnet mask is incorrect.
B.TheDHCP server is offline.
C.TheIP address is an RFC1918 private address.
D.TheDNS server is unreachable.

Correct Answer: B

* Understanding the 169.254.x.x Address:
* An IPv4 address in the range of 169.254.x.x is an Automatic Private IP Addressing (APIPA) address, assigned when a DHCP server is unavailable.
* DHCP Server Offline:
* APIPA Assignment: When a device cannot obtain an IP address from a DHCP server, it assigns itself an APIPA address to enable local network communication. This allows communication with other devices on the same local subnet but not with external networks.
* Resolution: Ensure the DHCP server is operational. Check for connectivity issues between the virtual machine and the DHCP server, and verify the DHCP server settings.
* Comparison with Other Options:
* The subnet mask is incorrect: The subnet mask 255.255.0.0 is appropriate for the 169.254.x.x range and does not prevent external access by itself.
* The IP address is an RFC1918 private address: RFC1918 addresses are private IP ranges (10.x.
x.x, 172.16.x.x-172.31.x.x, 192.168.x.x) but 169.254.x.x is not one of them.
* The DNS server is unreachable: While this could affect name resolution, it would not prevent the assignment of a non-APIPA address or local network communication.
* Troubleshooting Steps:
* Verify the DHCP server's status and connectivity.
* Restart the DHCP service if necessary.
* Renew the IP lease on the virtual machine using commands such as ipconfig /renew (Windows) or dhclient (Linux).
References:
* CompTIA Network+ study materials on IP addressing and DHCP troubleshooting.

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Question 247

Which of the following can also provide a security feature when implemented?

A.NAT
B.BGP
C.FHRP
D.EIGRP

Correct Answer: A

NAT (Network Address Translation) helps hide internal IP addresses from external networks, adding a layer of security by preventing direct access to internal systems from the outside.

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Question 248

A data center interconnect using a VXLAN was recently implemented. A network engineer observes slow performance and fragmentation on the interconnect. Which of the following technologies will resolve the issue?

A.802.1Q tagging
B.Spanning tree
C.Link aggregation
D.Jumbo frames

Correct Answer: D

VXLAN (Virtual Extensible LAN) encapsulates Ethernet frames inside UDP packets, increasing packet size. This can lead to fragmentation and performance degradation unless Jumbo Frames are enabled.
Breakdown of Options:
A . 802.1Q tagging - VLAN tagging enables segmentation but does not address fragmentation issues.
B . Spanning tree - STP prevents loops but does not improve performance for VXLAN traffic.
C . Link aggregation - LACP combines links for higher bandwidth but does not prevent fragmentation.
D . Jumbo frames - Correct answer. Enabling Jumbo Frames allows larger packet sizes, reducing fragmentation and improving VXLAN performance.
Reference:
CompTIA Network+ (N10-009) Official Study Guide - Domain 2.3: Explain network performance concepts.
RFC 7348: VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks

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Question 249

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

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 . A router with only one available LAN port: This is correct. Subinterfaces allow a single physical interface to manage multiple networks, making it essential for routers with limited physical interfaces.
B . A firewall performing deep packet inspection: Firewalls can use subinterfaces, but it is not a requirement for deep packet inspection.
C . A hub utilizing jumbo frames: Hubs do not use subinterfaces as they operate at Layer 1 and do not manage IP addressing.
D . A switch using Spanning Tree Protocol: STP is a protocol for preventing loops in a network and does not require subinterfaces.
Conclusion:
Subinterfaces provide a practical solution for routing between multiple VLANs on a router with limited physical interfaces. They allow network administrators to optimize the use of available hardware resources efficiently.
Reference:
CompTIA Network+ guide detailing VLAN configurations and the use of subinterfaces (see page Ref 9†Basic Configuration Commands).

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Question 250

A network administrator recently configured an autonomous wireless AP and performed a throughput test via comptiaspeedtester.com. The result was 75 Mbps. When connected to other APs, the results reached 500 Mbps. Which of the following is most likely the reason for this difference?

A.Channel width configuration
B.DNS server issues
C.Authentication failure
D.Incorrect DHCP settings

Correct Answer: A

The channel width (20 MHz vs. 40 MHz vs. 80 MHz) directly impacts Wi-Fi throughput. If the AP is configured with a narrow channel width (e.g., 20 MHz), maximum data rates will be significantly lower than other APs using wider channels (e.g., 80 MHz). This matches the scenario where one AP achieves only ~75 Mbps, while others reach 500 Mbps.
B . DNS issues affect name resolution, not raw throughput.
C . Authentication failure would prevent connection, not reduce throughput.
D . DHCP issues would prevent obtaining an IP, not cause slower speeds.
Reference (CompTIA Network+ N10-009):

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