CompTIA Network+ Practice Test for Subdomain 5.2 #03

Welcome to today’s CompTIA Network+ practice test!

This practice test uses our new UI!

Today’s practice test is based on Subdomain 5.2 (Given a scenario, troubleshoot common cabling and physical interface issues) from the CompTIA Network+ N10-009 objectives.

This beginner-level practice test is inspired by the CompTIA Network+ (N10-009) exam and is designed to help you reinforce key networking concepts on a daily basis.

These questions are not official exam questions, nor are they brain dumps, but they reflect topics and scenarios relevant to the Network+ certification. Use them to test your knowledge, identify areas for improvement, and build daily cybersecurity habits.

Note: CompTIA and Network+ are registered trademarks of CompTIA. This content is not affiliated with or endorsed by CompTIA.

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CompTIA Network+ Practice Test of the Day 260705

10 questions • Single best answer

Question 1

A field technician connects a new fiber run between two data center switches. One switch reports the link as up, but the remote switch shows no incoming signal on its fiber port. Both SFP modules test as functional individually. What is the most likely cause?

A. The fiber cable has exceeded maximum allowable attenuation B. A faulty SFP module is installed in the receiving switch C. Multimode fiber is being used where single-mode is required D. The transmit and receive fiber strands are transposed

Question 2

A network engineer reviewing interface counters on a core switch finds rapidly increasing CRC errors on a port connected to a workstation. The cable is the correct category for the configured speed and shows no visible physical damage. What is the most likely cause?

A. The cable category is incorrect for the configured port speed B. The cable has improper termination causing signal integrity degradation C. A transceiver mismatch exists between the switch and workstation NIC D. A duplex mismatch is generating runts on the interface

Question 3

A technician at a university runs a new copper drop measuring 125 meters from an IDF to an end-user office. Users on this segment report intermittent connectivity and high packet loss despite the cable passing continuity testing. What is the most likely cause?

A. Crosstalk from adjacent unshielded pairs is corrupting transmitted frames B. The cable has an incorrect termination pinout at the wall jack C. Excessive cable length is causing signal attenuation beyond specification D. The connected switch port is in an error-disabled state

Question 4

A senior engineer is troubleshooting a fiber uplink between a distribution switch and a core router. Both ports show administratively up but no light passes between them. Both SFP modules are rated for the same link speed. What is the most likely cause?

A. A wavelength or type mismatch exists between the SFP transceivers B. Adjacent fiber cables are causing electromagnetic crosstalk C. The fiber run exceeds the rated distance for the installed SFP modules D. TX and RX fiber strands are transposed on the distribution switch

Question 5

A network admin receives a report that a specific access switch port is no longer forwarding traffic. Running show interface confirms the port is in error-disabled state. What condition most commonly triggers this port state?

A. A failed SFP module installed in the affected port B. A cable exceeding maximum run length for the configured port speed C. A link speed mismatch between the switch port and the connected device D. A port security violation caused the port to enter error-disabled state

Question 6

A network engineer receives multiple tickets from users reporting that IP phones are randomly rebooting throughout the workday. Reviewing the access switch, the total power draw across all PoE ports is found to exceed the switch's rated capacity. What is the cause?

A. The IP phones are using an incompatible PoE standard B. The switch's PoE power budget is exceeded C. The voice VLAN is misconfigured, interrupting phone power negotiation D. STP is causing port flapping on the voice-capable access switch

Question 7

A network administrator notices a steadily increasing giants counter on an inter-switch link. No configuration changes were made recently, but a new application server was added to the connected segment. What is the most likely cause?

A. A duplex mismatch between the server and the switch is generating oversized frames B. The cable run between the switches has degraded, causing frame corruption C. The server is transmitting frames that exceed the port's maximum MTU D. A failing SFP module is introducing errors interpreted as giants

Question 8

A technician replaces a failed fiber run between buildings using multimode cable. After the swap, the inter-building link fails to establish even though the previous single-mode cable worked correctly. What is the most likely cause?

A. Single-mode and multimode fiber are incompatible and require conversion hardware B. The replacement cable has a broken strand at one of the connectors C. The installed SFP modules do not support multimode fiber operation D. The MPO connector on the new cable is not fully seated

Question 9

A network technician at a manufacturing plant finds that Ethernet drops installed near heavy motors and overhead fluorescent lighting are generating high frame error rates and inconsistent throughput. What is the most likely cause?

A. Incorrect RJ45 pinout at the wall jacks is corrupting frame headers B. The installed cable category is insufficient for the required gigabit speeds C. Short cable runs are producing signal reflections on copper pairs D. Electromagnetic interference is inducing noise on unshielded copper cabling

Question 10

A junior engineer reports that a newly installed workstation has no network connectivity despite the cable testing clean and the NIC driver loading without errors. Running show interface on the connected switch port returns administratively down. What is the cause?

A. A port security violation placed the port into error-disabled state B. The port has been manually shut down and must be brought up administratively C. The installed SFP module in the switch port requires replacement D. Insufficient PoE budget is preventing the switch from powering the port

CompTIA Network+ Practice Test for Subdomain 5.2 #03

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