Free CompTIA Network+ Exam Questions and Answers
Updated October 13, 2026 | 20 questions with full answers
The short answer
Network+ N10-009 is up to 90 questions in 90 minutes and you need 720 out of 900 to pass. The questions below are drawn from our 937-question N10-009 bank and cover all five domains, printed with the answer and the explanation so you can check your reasoning rather than just your result.
N10-009 exam facts
| Questions | Up to 90 (multiple choice, multiple response, PBQs) |
| Time limit | 90 minutes |
| Passing score | 720 / 900 (scaled) |
| Cost | $369 USD (voucher) |
| Delivery | Pearson VUE test centre or OnVUE online proctored |
| Prerequisites | None, but CompTIA recommends A+ and 9-12 months of networking experience |
What the exam covers, domain by domain
| Domain | Weight | What it tests |
|---|---|---|
| 1.0 Networking Concepts | 23% | OSI model, TCP/IP, ports and protocols, IP addressing, subnetting, topologies. |
| 2.0 Network Implementation | 20% | Routing, switching, VLANs, wireless, cabling and network device configuration. |
| 3.0 Network Operations | 19% | Monitoring, documentation, high availability, disaster recovery, cloud networking. |
| 4.0 Network Security | 14% | Hardening, access control, wireless security, common network attacks. |
| 5.0 Network Troubleshooting | 24% | Diagnostics, cable issues, protocol analysis, and a structured troubleshooting method. |
20 free N10-009 exam questions with answers
Real questions from our 937-question N10-009 bank, spread across every domain. The correct answer is marked and every question carries an explanation, so you can check the reasoning and not just the result. The interactive mocks serve the full bank, timed and scaled-scored.
A security audit reveals that a server is listening on port 1433. Which database service is most likely running?
- ○ MySQL
- ○ PostgreSQL
- ✓ Microsoft SQL Server
- ○ Oracle DB
Which network service directory services authentication?
- ○ DHCP
- ○ DNS
- ○ NTP
- ✓ LDAP
Which switching concept is defined as: "Power over Ethernet, delivers power via data cable"?
- ○ Trunk
- ○ EtherChannel
- ○ VLAN
- ✓ PoE
Which virtualization networking term virtual network interface card?
- ✓ vNIC
- ○ Port group
- ○ vSwitch
- ○ VLAN tagging
Which segmentation method granular per-workload security?
- ○ VLAN
- ✓ Microsegmentation
- ○ DMZ
- ○ Subnetting
Which network doc shows IP addressing?
- ○ Asset inventory
- ○ Cable map
- ✓ Logical diagram
- ○ Physical diagram
Which network documentation records all network changes?
- ✓ Change log
- ○ Physical network diagram
- ○ Logical network diagram
- ○ Cable map
Which attack is described as: "Corrupts DNS cache to redirect users"?
- ○ DDoS
- ○ Man-in-the-middle
- ○ Rogue AP
- ✓ DNS poisoning
A technician is sent to a wiring closet to trace a specific Cat 6 cable from a wall jack to its termination point on a patch panel among hundreds of cables. Which tool should the technician use FIRST to accomplish this task?
- ○ Multimeter
- ○ Cable tester
- ✓ Tone generator and probe
- ○ Protocol analyzer
A network administrator needs to configure a temporary test environment that requires 12 subnets, with the largest subnet needing 28 host addresses. Using VLSM with the base network 192.168.50.0/24, what is the most efficient subnet mask that should be applied to accommodate this requirement?
- ○ /26
- ✓ /27
- ○ /28
- ○ /29
Which service directory access protocol?
- ✓ LDAP
- ○ SFTP
- ○ TACACS+
- ○ SYSLOG
Which routing concept manually configured?
- ✓ Static route
- ○ Dynamic route
- ○ Route table
- ○ Default route
Which SDN/virtualization term is defined as: "Generic Routing Encapsulation, tunneling protocol"?
- ✓ GRE
- ○ IPsec
- ○ VXLAN
- ○ NFV
Which segmentation method ip-based segmentation at layer 3?
- ○ Microsegmentation
- ○ DMZ
- ○ VLAN
- ✓ Subnetting
Which SNMP version auth and encryption?
- ✓ SNMPv3
- ○ SNMPv1
- ○ SNMPv2c
Which network documentation shows physical layout and connections?
- ○ Logical network diagram
- ○ Change log
- ○ Cable map
- ✓ Physical network diagram
A company hosts a critical web application that is frequently targeted by application-layer attacks, including SQL injection and cross-site scripting (XSS). The security team needs a network security device that specializes in inspecting HTTP/HTTPS traffic and blocking these types of attacks. Which type of firewall is best suited for this purpose?
- ○ Stateless firewall
- ○ Stateful firewall
- ○ Next-generation firewall (NGFW)
- ✓ Web application firewall (WAF)
Which network issue is loose connection?
- ○ Slow network
- ✓ Intermittent connectivity
- ○ No internet
- ○ High latency
Which IPv6 address type uses prefix 2000::/3 and routable internet address?
- ○ Unique local
- ○ Link-local
- ○ Multicast
- ✓ Global unicast
Which service remote authentication dial-in user service?
- ○ LDAP
- ○ NTP
- ✓ RADIUS
- ○ TACACS+
How to use these questions
Subnetting is unavoidable and it is worth more than the marks it appears to carry, because it underpins questions in three domains. Get fluent at converting between CIDR notation, subnet mask and host range before you touch anything else.
Domain 5 (Troubleshooting) is 24% and it is scenario-based. Learn the CompTIA troubleshooting method as a sequence - identify, establish a theory, test, plan, implement, verify, document - because questions often ask which step comes next rather than what the fault is.
N10-009 added real weight to cloud and virtual networking. If you are studying from older material, top up on VPCs, SDN, and cloud connectivity models or you will lose marks in Domains 2 and 3.
Practise reading simulated command output. PBQs on N10-009 include console-style tasks, so recognising `ipconfig /all`, `tracert` and `nslookup` output at a glance saves real time.
Frequently asked questions
What is the passing score for Network+ N10-009?
720 out of 900 on a scaled score, which works out at roughly 75-80% of questions correct. The exact raw score varies by exam version because of scaling.
How many questions are on the Network+ N10-009 exam?
Up to 90 questions in 90 minutes, a mix of multiple choice, multiple response and performance-based questions (PBQs).
How much does the Network+ exam cost?
$369 USD for a standard voucher. CompTIA sometimes bundles a retake, which is worth considering given the 90-minute time pressure.
Is Network+ harder than A+?
They test different things. A+ is broader and more hardware-focused; Network+ goes deeper on addressing, routing and troubleshooting. Most people find Network+ the harder of the two because subnetting is unforgiving.
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