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Free CompTIA Network+ (N10-009) practice test

The CompTIA Network+ (N10-009) tests networking concepts, implementation, operations, security, and troubleshooting. This site gives you 355 original practice questions and 20 performance-based questions for it, free and without an account: adaptive drills with an explanation after every answer, and a full 90-minute exam simulation with 50 questions plus 3 PBQs on the real 100 to 900 scale.

Network+ leans hard on applied skills: reading topology diagrams, knowing ports cold, and working subnetting under time. The PBQ lab here simulates those formats, including a command-line terminal and clickable network diagrams. Every topic links to the matching free Professor Messer video.

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What N10-009 covers

N10-009 domainExam weightQuestions here
1.0 Networking Concepts23%about 82
2.0 Network Implementation20%about 71
3.0 Network Operations19%about 67
4.0 Network Security14%about 50
5.0 Network Troubleshooting24%about 85

Real exam facts: up to 90 questions, 90 minutes, passing score 720 on the 100 to 900 scale.

Practice questions from this bank

Sample question 1 · N10-009 · 1.0 Networking Concepts

Which OSI layer is responsible for logical addressing and routing between different networks?

  1. ALayer 3 (Network)
  2. BLayer 2 (Data Link)
  3. CLayer 4 (Transport)
  4. DLayer 7 (Application)
Show answer and explanation

A. Layer 3 (Network)

Layer 3, the Network layer, handles logical (IP) addressing and routing between networks.

Topic: Understanding the OSI Model

Sample question 2 · N10-009 · 2.0 Network Implementation

Which routing method requires an administrator to manually configure each route and does not adapt to topology changes?

  1. AStatic routing
  2. BDynamic routing
  3. COSPF
  4. DLink-state routing
Show answer and explanation

A. Static routing

Static routes are entered manually and must be updated by hand when the network changes.

Topic: Static Routing

Sample question 3 · N10-009 · 3.0 Network Operations

Which server automatically leases IP configuration (address, mask, gateway, DNS) to network clients?

  1. ADHCP
  2. BDNS
  3. CSNMP
  4. DNTP
Show answer and explanation

A. DHCP

DHCP dynamically provides IP configuration to clients, avoiding manual static assignment.

Topic: DHCP

Sample question 4 · N10-009 · 4.0 Network Security

In the CIA triad, which principle ensures data has not been altered by unauthorized parties?

  1. AIntegrity
  2. BConfidentiality
  3. CAvailability
  4. DAccounting
Show answer and explanation

A. Integrity

Integrity ensures data remains accurate and unmodified; confidentiality protects secrecy and availability ensures access.

Topic: Security Concepts

Sample question 5 · N10-009 · 5.0 Network Troubleshooting

What is the FIRST step of the CompTIA network troubleshooting methodology?

  1. AIdentify the problem
  2. BEstablish a theory of probable cause
  3. CImplement the solution
  4. DDocument the outcome
Show answer and explanation

A. Identify the problem

The methodology begins by identifying the problem — gathering information, questioning users, and determining the scope.

Topic: Network Troubleshooting Methodology

Sample question 6 · N10-009 · 1.0 Networking Concepts

In which topology does every device connect to a central switch, so a single cable fault affects only one node?

  1. AStar
  2. BBus
  3. CRing
  4. DMesh
Show answer and explanation

A. Star

In a star topology each node connects to a central device; one link failure isolates only that node.

Topic: Network Topologies

Sample question 7 · N10-009 · 2.0 Network Implementation

A network that spans multiple cities using leased carrier links is best described as which type?

  1. AWAN
  2. BLAN
  3. CPAN
  4. DSAN
Show answer and explanation

A. WAN

A WAN (wide area network) connects sites over large geographic distances, often using carrier circuits.

Topic: Network Types

Sample question 8 · N10-009 · 3.0 Network Operations

Which metric defines the maximum acceptable amount of data loss, measured in time?

  1. ARPO
  2. BRTO
  3. CMTBF
  4. DMTTR
Show answer and explanation

A. RPO

RPO is how far back your last good recovery point is — the maximum tolerable amount of data loss. RPO = Recovery Point Objective.

Topic: Disaster Recovery

Practice all 355 free

Common questions

How many questions are on the Network+ exam?

The N10-009 exam has a maximum of 90 questions in 90 minutes, combining multiple choice and performance-based questions. The passing score is 720 on a 100 to 900 scale.

Do I need A+ before Network+?

No, A+ is recommended but not required. If you already work with networks or are comfortable with hardware basics, starting at Network+ is common and completely allowed.

What topics does N10-009 cover?

Five domains: networking concepts (23%), network implementation (20%), network operations (19%), network security (14%), and network troubleshooting (24%). Our drills track your accuracy in each domain separately.

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