CompTIA Network+ (N10-009) Practice Test
Build your confidence for CompTIA Network+ (N10-009). Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
CompTIA Network+ N10-009 covers networking concepts, implementation, operations, security and troubleshooting. It is vendor-neutral and includes both knowledge questions and performance-based assessment. This independent practice page helps you reason about network behavior and fault isolation. Use the N10-009 objectives to check coverage, and combine question review with practical configuration and troubleshooting exercises.
Sample Questions
Choose an answer and explore the explanation to see how practice works.
In a 2025 SaaS support office, The NOC needs to determine which applications consumed a WAN link during a 15-minute spike without storing full packet payloads. The help desk also notes one stale inventory record from last quarter. Which telemetry is best? (Objective 3.5 Monitoring)
In a 2025 college campus building, Two load balancers are deployed in active/passive mode and applications point to one address that moves during failover. The asset tag on one patch panel is outdated, but the cable map was updated yesterday. What address type is being used? (Objective 2.1 VIP)
In a 2025 multisite legal firm, A 10GBASE-T uplink over a long reused Cat 5e run links up at 1 Gbps and shows errors during backups. The asset tag on one patch panel is outdated, but the cable map was updated yesterday. What is the most likely physical issue? (Objective 5.2 Cable type)
In a 2025 city government annex, Only one subnet cannot reach a new API, while traceroute reaches the firewall and logs show denied TCP 443 from that subnet. The asset tag on one patch panel is outdated, but the cable map was updated yesterday. What is the most likely issue? (Objective 5.3 ACL)
In a 2025 distribution warehouse, A printer appears at 169.254.44.20/16 after a power outage, and users cannot print across subnets. A facilities work order lists a cabinet move that has not started yet. What does this address indicate? (Objective 1.9 IPv4)
Career Opportunities & Salary
Exam insights and study advice
For each fault, record the affected scope, the last known working state and the evidence from the relevant network layer. Choose the next test that distinguishes two plausible causes rather than changing several settings at once. Keep a short table of symptoms, diagnostic commands and expected observations, then use it to explain your practice answers.
Recommended
These are the backgrounds the certifying body suggests. Check the vendor's own page for anything it formally requires.
Your Path Forward
What this exam covers
Use the published domain weights to plan your study. Practice results do not predict your certification exam score.
01Network troubleshooting
Topics
- Troubleshooting methodology
- Cabling and physical interface issues
- Network services issues
- Performance issues
- Tools and protocols
Learning objectives
- Troubleshooting methodology: identifying the problem; establishing a theory; testing; planning; implementing a solution; verifying functionality; documenting findings
- Cabling and physical interface issues: cable issues (incorrect type, signal degradation, improper termination, TX/RX transposed); interface issues (increasing counters, port status); hardware issues (PoE, transceiver mismatch, signal strength)
- Network services issues: switching issues (STP, VLAN assignment, ACLs); routing issues (routing table and default routes); address pool exhaustion; incorrect gateway/IP/subnet mask
- Performance issues: congestion; latency; packet loss; wireless interference
- Tools and protocols: protocol analyzers; command line tools; cable testers; Wi-Fi analyzers
02Networking concepts
Topics
- OSI model layers
- Networking appliances
- Cloud concepts
- Ports and protocols
- Traffic types
- Transmission media
- Transceivers and connectors
- Network topologies
- IPv4 addressing
Learning objectives
- OSI model layers: physical; data link; network; transport; session; presentation; application
- Networking appliances: routers; switches; firewalls; IDS/IPS; load balancers; proxies; NAS; SAN; wireless devices
- Cloud concepts: NFV; VPC; network security groups; cloud gateways; deployment models (public, private, hybrid); service models (SaaS, IaaS, PaaS)
- Ports and protocols: FTP; SFTP; SSH; Telnet; SMTP; DNS; DHCP; HTTP; HTTPS; SNMP; LDAP; RDP; SIP
- Traffic types: unicast; multicast; anycast; broadcast
- Transmission media: wireless (802.11, cellular, satellite); wired (fiber, coaxial, DAC)
- Transceivers and connectors: SC; LC; ST; MPO; RJ11; RJ45; F-type; BNC
- Network topologies: mesh; hybrid; star/hub and spoke; spine and leaf; point-to-point; three-tier; collapsed core
- IPv4 addressing: public vs. private; APIPA; RFC1918; loopback; subnetting (VLSM, CIDR); address classes (A, B, C, D, E)
03Network implementation
Topics
- Routing technologies
- Switching technologies
- Wireless devices
- Physical installations
Learning objectives
- Routing technologies: static and dynamic routing (BGP, EIGRP, OSPF); route selection; NAT; PAT; FHRP; VIP; subinterfaces
- Switching technologies: VLANs; interface configuration; spanning tree; MTU; jumbo frames
- Wireless devices: channels; frequency options; SSID; network types; encryption; guest networks; authentication; antennas; access points
- Physical installations: installation implications; power considerations; environmental factors
04Network operations
Topics
- Documentation
- Life-cycle management
- Change management
- Configuration management
- Network monitoring
- Disaster recovery
- Network services
- Access and management
Learning objectives
- Documentation: physical vs. logical diagrams; rack diagrams; cable maps; network diagrams; asset inventory; IPAM; SLA; wireless surveys
- Life-cycle management: EOL; EOS; software management; decommissioning
- Change management: request process tracking
- Configuration management: production; backup; baseline configurations
- Network monitoring: SNMP; flow data; packet capture; baseline metrics; log aggregation; API integration; port mirroring
- Disaster recovery: RPO; RTO; MTTR; MTBF; cold/warm/hot sites; active-active/passive; testing
- Network services: DHCP; SLAAC; DNS; NTP; PTP; NTS
- Access and management: VPNs; SSH; GUI; API; console
05Network security
Topics
- Logical security
- Physical security
- Deception technologies
- Security terminology
- Audits and compliance
- Network segmentation
- Types of attacks
- Security features and defense
Learning objectives
- Logical security: encryption (data in transit/rest); PKI; IAM; MFA; SSO; RADIUS; LDAP; SAML; TACACS+; time-based authentication; authorization; least privilege; role-based access control; geofencing
- Physical security: cameras and locks
- Deception technologies: honeypot; honeynet
- Security terminology: risk; vulnerability; exploit; threat; CIA triad
- Audits and compliance: data locality; PCI DSS; GDPR
- Network segmentation: IoT; IIoT; SCADA; ICS; OT; guest; BYOD
- Types of attacks: DoS/DDoS; VLAN hopping; MAC flooding; ARP poisoning/spoofing; DNS poisoning/spoofing; rogue devices/services; evil twin; on-path attack; social engineering (phishing, dumpster diving, shoulder surfing, tailgating)
- Security features and defense: device hardening; NAC; key management; ACL; URL/content filtering; trusted vs. untrusted zones; screened subnet