Free CompTIA Network+ N10-009 Networking Fundamentals Practice Test 2026 — CompTIA Network+ (N10-009) Questions

This free CompTIA Network+ N10-009 Networking Fundamentals practice test covers Net+ Domain 1 (~23%) — networking fundamentals, including the OSI/TCP-IP models, ports/protocols, IPv4/IPv6, subnetting, cabling, and topologies. Each question includes a detailed explanation aligned to the N10-009 exam objectives — perfect for Network+ exam prep.

Key Topics in CompTIA Network+ N10-009 Networking Fundamentals

6 Free CompTIA Network+ N10-009 Networking Fundamentals Practice Questions with Answers

Sample Question 1 — 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 2 — 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.

Sample Question 3 — Networking Fundamentals

Which of the following cables is most suitable for a 10 Gbps Ethernet network over a distance of 55 meters?

  1. A. Cat 5e
  2. B. Cat 6
  3. C. Cat 6a (Correct answer)
  4. D. Cat 7

Correct answer: C

Explanation: Cat 6a cables are designed to support 10 Gbps Ethernet over distances up to 100 meters, making them suitable for this scenario.

Sample Question 4 — Networking Fundamentals

Which topology is characterized by a central connection point for all network devices?

  1. A. Bus
  2. B. Star (Correct answer)
  3. C. Ring
  4. D. Mesh

Correct answer: B

Explanation: In a star topology, all network devices connect to a central hub or switch, making it easy to manage and troubleshoot.

Sample Question 5 — Networking Fundamentals

A network administrator needs to segment a network into multiple broadcast domains. Which technology should they implement?

  1. A. VLAN (Correct answer)
  2. B. Subnetting
  3. C. NAT
  4. D. VPN

Correct answer: A

Explanation: VLANs (Virtual Local Area Networks) allow network administrators to segment a network into multiple broadcast domains without requiring physical separation.

Sample Question 6 — Networking Fundamentals

Which IPv6 address type is used for one-to-nearest communication?

  1. A. Unicast
  2. B. Multicast
  3. C. Anycast (Correct answer)
  4. D. Broadcast

Correct answer: C

Explanation: Anycast addresses are used in IPv6 to route data to the nearest instance of a service, providing efficient one-to-nearest communication.

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