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CompTIA Network+ N10-009 Practice Test

472 questions with instant explanations, domain breakdown, and wrong-answer analysis. Built for the real exam.

Instant feedback after each answer
Full explanations included
Domain score breakdown
Real exam: 90 min
Pass mark: 720/1000

Sample questions with explanations

This is exactly what you see during practice — question, options, and a full explanation after you answer.

Q1Network Operationsmedium
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A network administrator wants to collect performance data from network devices over time and receive alerts when thresholds are exceeded. Which protocol should be used?

Asyslog
SNMPCorrect
CNetFlow
DICMP

SNMP (Simple Network Management Protocol) is designed to collect performance data from network devices by polling MIB (Management Information Base) objects and can generate traps or inform requests to send alerts when thresholds are exceeded. This makes it the correct choice for …Read full explanation

Q2Network Troubleshootinghard
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A switch is connected to a network printer. The switch port is manually configured for 100 Mbps and full duplex. The printer is configured for auto-negotiation. The link is up, but there are many FCS errors on the switch port. What is the most likely cause?

Duplex mismatchCorrect
BBad Ethernet cable
CSpeed mismatch
DPrinter driver issues

The most likely cause is a duplex mismatch. The switch port is manually set to full duplex, while the printer is using auto-negotiation. When one side is manually configured and the other is set to auto-negotiation, the auto-negotiating side fails to detect the manual setting and…Read full explanation

Q3Networking Conceptsmedium
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A network engineer is reviewing RFC 1918 address ranges to plan a private IP addressing scheme. Which of the following IP addresses falls within the private address space for Class A?

A172.16.0.1
B192.168.1.1
10.10.10.1Correct
D172.32.0.1

RFC 1918 defines the Class A private address range as 10.0.0.0/8, which includes all addresses from 10.0.0.0 to 10.255.255.255. 10.10.10.1 falls within this range, making it a valid private IP address for internal network use.

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Exam-style questions

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