CompTIA Network+ Practice Test for Subdomain 5.2 #02

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.

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CompTIA Network+ Practice Test of the Day 260530

10 questions • Single best answer

Question 1

A junior network engineer at a manufacturing plant notices two Ethernet cables run parallel for over 30 feet inside a cable tray. Users report random disconnections and error frames on both segments. A cable tester confirms all wires are properly terminated with no open or short circuits. What is the most likely cause?

A. Attenuation due to cable length B. Open circuit in one conductor C. TX/RX reversal on one cable D. Crosstalk between adjacent cables

Question 2

A field technician connects a fiber uplink between two switches and no link light appears on either end. The cable is visually intact and fully seated. The technician swaps the fiber strands at one end of the cable, and both link lights immediately come up. What was the problem?

A. TX/RX reversal on the fiber strand B. Transceiver mismatch between switch models C. Dirty fiber connectors causing insertion loss D. Excessive attenuation from a tight bend in the cable

Question 3

A network technician installs a Cat6 run of 110 meters between a remote access point and the IDF. The AP associates to the wireless controller but clients experience consistently poor throughput and high error rates. No physical damage is visible on the cable. What is the most likely cause?

A. Split pair introduced during termination B. Attenuation caused by exceeding the maximum cable segment length C. Crosstalk from adjacent cable runs D. Incorrect cable pinout using mixed wiring standards

Question 4

A technician uses a cable tester on a dead network drop and finds that some conductors show continuity while one wire within a pair shows no connectivity at either end. What physical condition does this test result indicate?

A. Split pair during termination B. TX/RX reversal C. Crosstalk between adjacent pairs D. Open circuit on one conductor

Question 5

During a structured cabling installation, a technician crimps an RJ-45 connector onto a Cat6 patch cable. The connection is intermittent under movement. Upon inspection with a magnifier, several pins inside the connector are not fully driven down through the wire insulation. What is causing the problem?

A. Improperly seated pins failing to pierce conductor insulation B. Attenuation from poor contact resistance C. TX/RX reversal due to incorrect wire order D. Incorrect cable category used for the installation

Question 6

A cable tester on a newly installed Cat5e run passes all continuity tests but fails the wire map. The report shows that one wire from pair 2 is swapped with a wire from pair 3 at both ends. What condition is indicated?

A. Short circuit between pairs B. Split pair C. TX/RX reversal D. Near-end crosstalk failure

Question 7

After installing a fiber run from an IDF to an MDF in a hospital, a technician measures high optical insertion loss at the connection point using an optical power meter. Cleaning both fiber end faces with an approved lint-free tool and re-testing shows normal signal levels. What was the root cause?

A. Contaminated fiber end faces causing increased insertion loss B. TX/RX polarity reversal on the patch cable C. Transceiver wavelength mismatch D. Cable bend radius violation

Question 8

A technician installs a new SFP module in a core switch to bring up a fiber uplink. The switch recognizes the module, but the link does not come up. The remote switch shows the same behavior. Both fiber runs test clean and TX/RX polarity is correct. What should the technician verify next?

A. Clean the fiber connectors on both ends B. Confirm that the SFP modules are compatible with both switch models C. Replace the fiber patch cable with a known-good cable D. Check for a bend radius violation

Question 9

A network technician at a branch office punches down cables on a patch panel using the T568B wiring standard, but the patch cables connecting the panel to switches were factory-terminated using T568A. Users on those drops experience complete connectivity failure. What is the root cause?

A. Crosstalk between incorrectly paired conductors B. Split pair introduced at the punch-down block C. Attenuation caused by impedance mismatch D. Incorrect pinout due to mismatched wiring standards at each end

Question 10

A data center technician measures receive power on a new fiber run at -19 dBm. The SFP datasheet specifies a minimum acceptable receive power of -14 dBm. The cable has no visible bends or damage. What is the most likely cause?

A. Contaminated connectors at the far end B. TX/RX polarity reversal C. Excessive decibel loss along the cable run D. Transceiver wavelength mismatch

CompTIA Network+ Practice Test for Subdomain 5.2 #02

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