CompTIA Network+ Practice Test for Subdomain 5.4 #02

Welcome to today’s CompTIA Network+ practice test!

This practice test uses our new UI!

Today’s practice test is based on Subdomain 5.4 (Given a scenario, troubleshoot common performance 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.

To choose CompTIA Network+ practice tests based on specific domains/subdomains, click that link.

CompTIA Network+ Practice Test of the Day 260601

10 questions • Single best answer

Question 1

An IT manager at a retail chain notices that file transfers between a branch office and headquarters slow dramatically during peak business hours. Network monitoring shows the WAN link utilization consistently at 95–100% during these periods. What is the root cause of the performance degradation?

A. Latency introduced by the routing protocol B. Bandwidth saturation causing network congestion C. Packet loss from a failing WAN interface D. MTU mismatch on the WAN circuit

Question 2

A VoIP administrator receives complaints from call center staff about choppy and robotic-sounding audio during calls. A packet capture shows that voice packets are arriving at irregular intervals with inconsistent inter-packet timing. What performance issue is affecting the calls?

A. High latency on the WAN circuit B. Packet loss from a congested uplink C. Bandwidth saturation dropping voice packets D. Jitter causing irregular packet arrival times

Question 3

A network engineer notices that large file transfers across a WAN link fail after a few seconds, while small file transfers complete successfully. A packet capture shows fragmentation needed but DF bit is set errors. What is the most likely cause?

A. MTU mismatch between network segments B. QoS policy deprioritizing large data transfers C. Duplex mismatch causing late collisions D. CRC errors from a damaged cable on the WAN interface

Question 4

A network technician monitoring a WAN link notices that applications time out sporadically even though the interface shows no errors and remains up. Periodic ping tests to the remote endpoint show occasional request timeouts mixed with successful replies. What performance issue is present?

A. Jitter causing variable delivery times B. Congestion only during scheduled backup windows C. Packet loss on the WAN circuit D. Latency from a high-hop-count path

Question 5

A network engineer testing a satellite internet link measures a consistent round-trip time of 680ms to a content delivery server. Business applications requiring real-time interaction perform poorly on this link. What performance issue is this?

A. Excessive jitter from atmospheric interference B. High latency inherent to satellite transmission distance C. Packet loss from satellite signal degradation D. Bandwidth limitation of the satellite circuit

Question 6

An enterprise deploys IP telephony but voice quality is poor despite adequate total bandwidth. A review shows bulk file transfers are consuming the same queue as voice traffic. A QoS policy was applied at deployment but voice traffic is not receiving preferential treatment. What is the most likely cause?

A. The WAN link has insufficient bandwidth for both traffic types B. High latency from spanning tree topology changes C. MTU mismatch causing voice packet fragmentation D. QoS misconfiguration resulting in incorrect traffic classification

Question 7

After a network infrastructure upgrade, a technician notices some older switches drop packets intermittently and exhibit unexpected behavior under load. Physical inspection and cabling tests are normal. No configuration changes were made to these switches during the upgrade. What should the technician investigate?

A. Out-of-date firmware on the older switches B. Duplex mismatch between old and new devices C. VLAN misconfiguration from the upgrade D. QoS policy conflict between old and new equipment

Question 8

A network administrator reviewing switch interface statistics finds a high count of late collisions on a specific port connected to a workstation. Throughput on that port is significantly degraded. What is the most likely cause?

A. Bandwidth saturation on the switch uplink B. Packet loss from a failing cable C. Duplex mismatch between the switch port and the workstation NIC D. QoS misconfiguration prioritizing other traffic

Question 9

A server's network interface periodically shows high error rates and throughput drops significantly before recovering on its own. The cable, switch port, and SFP transceiver have all been replaced without improvement. What should be investigated next?

A. MTU mismatch on the server's network interface B. QoS configuration marking server traffic incorrectly C. Spanning tree topology changes affecting the server port D. Hardware failure of the server NIC itself

Question 10

A network technician reviews interface counters on a distribution switch and finds a high number of CRC errors on a port connected to a remote access switch. The cable is visually intact. What is the most likely cause of the CRC errors?

A. MTU mismatch between the two switches B. Physical layer issue such as a damaged cable or dirty connector C. Duplex mismatch causing late collisions counted as CRC errors D. QoS misconfiguration causing improper frame handling

CompTIA Network+ Practice Test for Subdomain 5.4 #02

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