Free CompTIA Network+ N10-009 Quick Practice Test 2026 — 10 Mixed-Domain CompTIA Network+ (N10-009) Questions

Take a fast, free CompTIA Network+ N10-009 practice test with 10 mixed-domain questions covering all 5 official Net+ domains. Perfect for a quick readiness check before exam day.

What's Covered (All 5 CompTIA Network+ N10-009 Domains)

10 Free CompTIA Network+ N10-009 Practice Questions with Answers

Sample Question 1 — Network Implementations

You are tasked with configuring a new router that will connect to an existing network using OSPF. The existing network uses area 0 for its backbone. Which of the following commands will correctly configure the router to participate in OSPF with the correct area?

  1. A. router ospf 1 network 192.168.1.0 0.0.0.255 area 0 (Correct answer)
  2. B. router ospf 1 network 192.168.1.0 255.255.255.0 area 0
  3. C. router ospf 1 network 192.168.1.0 0.0.0.255 area 1
  4. D. router ospf 1 network 192.168.1.0 255.255.255.0 area 1

Correct answer: A

Explanation: In OSPF configuration, the network command uses a wildcard mask, not a subnet mask. For a /24 network, the correct wildcard mask is 0.0.0.255. Since the existing network uses area 0, the configuration must also specify area 0.

Sample Question 2 — Network Implementations

A network engineer is implementing a new DHCP server in a network segment that already has a DHCP server. What configuration should the engineer use to ensure the new server does not interfere with the existing server?

  1. A. Configure the new server with a different IP address range that does not overlap with the existing server. (Correct answer)
  2. B. Set the new server to a higher priority than the existing server.
  3. C. Use the same IP address range as the existing server to ensure consistency.
  4. D. Disable DHCP on the new server and use it as a backup.

Correct answer: A

Explanation: To avoid IP address conflicts, the new DHCP server should be configured with a non-overlapping IP address range. This prevents both servers from assigning the same IP addresses to different devices.

Sample Question 3 — Network Operations

You are tasked with improving the performance of a company's network. After reviewing the network documentation, you notice that several links between switches are nearing their bandwidth capacity. What is the most effective way to address this issue?

  1. A. Implement link aggregation to increase bandwidth between switches. (Correct answer)
  2. B. Replace all copper cables with fiber optics.
  3. C. Reconfigure the switches to use a different VLAN.
  4. D. Install additional switches to distribute the load.

Correct answer: A

Explanation: Link aggregation, also known as port trunking, allows multiple network connections to be combined into a single logical link, effectively increasing the bandwidth between switches without the need for additional hardware.

Sample Question 4 — Network Operations

While monitoring network performance, you notice a consistent increase in latency during peak hours. Which tool would best help you identify the source of the latency?

  1. A. Packet sniffer
  2. B. Network mapper
  3. C. Bandwidth analyzer (Correct answer)
  4. D. Ping utility

Correct answer: C

Explanation: A bandwidth analyzer can help identify which applications or devices are consuming the most bandwidth, allowing you to pinpoint the source of the latency during peak hours.

Sample Question 5 — Network Security

A network administrator wants to implement a security measure that ensures data cannot be read if intercepted during transmission. Which protocol should be used to encrypt data between a client and a server?

  1. A. HTTP
  2. B. HTTPS (Correct answer)
  3. C. FTP
  4. D. SNMP

Correct answer: B

Explanation: HTTPS (Hypertext Transfer Protocol Secure) uses SSL/TLS to encrypt data transmitted between a client and a server, ensuring confidentiality and integrity. HTTP, FTP, and SNMP do not inherently provide encryption.

Sample Question 6 — Network Security

During a security audit, it was discovered that unauthorized devices are connecting to the company's wireless network. What access control method can be implemented to prevent this?

  1. A. MAC filtering (Correct answer)
  2. B. Static IP addressing
  3. C. SSID hiding
  4. D. Port mirroring

Correct answer: A

Explanation: MAC filtering allows the network administrator to specify which devices are allowed to connect to the network based on their MAC addresses, effectively preventing unauthorized devices from gaining access.

Sample Question 7 — Network Troubleshooting and Tools

You are troubleshooting a network connectivity issue where a user cannot access the internet. The user's IP address is 192.168.1.10/24, and their gateway is set to 192.168.1.1. You can ping the gateway, but cannot ping 8.8.8.8. What is the most likely cause?

  1. A. The user's subnet mask is incorrect.
  2. B. The DNS server is unreachable.
  3. C. The gateway's routing table is missing a default route. (Correct answer)
  4. D. The user's IP address is in conflict with another device.

Correct answer: C

Explanation: Since you can ping the gateway but not an external IP, it indicates that the gateway does not have a route to the internet. This is likely due to a missing default route in the gateway's routing table.

Sample Question 8 — Network Troubleshooting and Tools

A network administrator is using a cable tester to diagnose a network issue. The tester shows a 'split pair' error for a particular cable. What does this indicate?

  1. A. The cable length exceeds the maximum allowed distance.
  2. B. Two wires in the cable are crossed. (Correct answer)
  3. C. The cable is not properly terminated.
  4. D. The cable has a break in one of the pairs.

Correct answer: B

Explanation: A 'split pair' error occurs when two wires in a twisted pair cable are crossed, causing crosstalk and signal degradation. This often happens when the cable is not terminated correctly.

Sample Question 9 — Networking Fundamentals

You are given an IP address of 192.168.1.10 with a subnet mask of 255.255.255.0. What is the network address for this IP?

  1. A. 192.168.1.0 (Correct answer)
  2. B. 192.168.1.1
  3. C. 192.168.0.0
  4. D. 192.168.1.255

Correct answer: A

Explanation: The subnet mask 255.255.255.0 indicates that the first three octets are the network part of the address. Therefore, the network address is 192.168.1.0.

Sample Question 10 — Networking Fundamentals

In which layer of the OSI model does a router operate?

  1. A. Data Link
  2. B. Network (Correct answer)
  3. C. Transport
  4. D. Application

Correct answer: B

Explanation: Routers operate at the Network layer (Layer 3) of the OSI model, where they use IP addresses to forward packets between networks.

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