CompTIA Network+ Practice Test for Subdomain 5.3 #03

Welcome to today’s CompTIA Network+ practice test!

This practice test uses our new UI!

Today’s practice test is based on Subdomain 5.3 (Given a scenario, troubleshoot common issues with network services) 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 260706

10 questions • Single best answer

Question 1

A junior network administrator at a manufacturing company observes broadcast traffic saturating all links at 100% utilization, causing complete network loss. Multiple redundant connections exist between access switches and the distribution layer with no redundancy protocol confirmed active. What is the most likely cause?

A. A network loop exists because Spanning Tree Protocol is not functioning correctly B. The default gateway on the core router is misconfigured C. Duplicate IP addresses are generating broadcast storms across VLANs D. The DHCP scope is exhausted, causing all devices to send unresolvable broadcasts

Question 2

A helpdesk team at a healthcare organization receives tickets from nurses on one floor who cannot access the EMR server, while staff on adjacent floors have full connectivity. Physical cabling and port status tests return no errors on any affected port. What is the most likely cause?

A. STP is blocking the uplink on the affected floor's access switch B. The default gateway is incorrect for the affected floor's subnet C. Affected workstation ports are assigned to the wrong VLAN D. The DHCP scope for the affected floor subnet has been exhausted

Question 3

A service desk at a call center is flooded with tickets after expanding from 200 to 350 agents. Affected workstations show 169.254.x.x addresses and cannot reach any network resources. All DHCP relay agents and server services appear operational. What is the most likely cause?

A. The DHCP relay agent on the router is misconfigured B. The DHCP address pool is exhausted and must be expanded C. A rogue DHCP server is assigning APIPA addresses to new clients D. The DHCP lease time is too short, causing rapid address conflicts

Question 4

A network admin receives reports that two workstations intermittently become unreachable in turns. ARP entries on the distribution router show conflicting MAC addresses associated with the same IP address. What is the cause?

A. STP port flapping is periodically changing which MAC addresses are reachable B. The subnet mask on both workstations is incorrectly configured C. The DHCP server is assigning leases outside the configured scope D. Two devices are configured with the same static IP address

Question 5

A technician at a logistics company confirms that workstations can communicate with each other on the local subnet but cannot reach any resources outside their segment. Valid IP addresses are assigned by DHCP and DNS appears functional. What is the most likely cause?

A. The default gateway address assigned by DHCP is incorrect B. The DHCP pool has been exhausted, causing address overlap C. An STP port role change is blocking inter-VLAN routing D. The DNS server IP is unreachable from the affected subnet

Question 6

A senior network engineer discovers that an underpowered access layer switch has been elected as the STP root bridge for the entire campus, causing all traffic to take suboptimal paths through the access layer. What is the correct resolution?

A. Enable PortFast on the access layer switch to bypass STP elections B. Disable STP on all inter-switch trunk links to prevent re-election C. Set a lower priority on the core switch to force it to become root bridge D. Increase the port cost on access switch uplinks to influence path selection

Question 7

A workstation at a remote office can communicate within its own subnet but cannot reach hosts in an adjacent subnet the router shows as directly connected. The workstation's IP address and default gateway are verified as correct. What is the most likely cause?

A. The adjacent subnet's default gateway is incorrectly configured B. The workstation has an incorrect subnet mask C. The routing table is missing a static route to the adjacent subnet D. VLAN tagging is absent on the trunk link between access switches

Question 8

A network admin confirms Layers 1 through 3 are functioning between a user VLAN and a server VLAN using the divide and conquer method. Ping from the user VLAN fails, and traceroute stops at the distribution router. What is the most likely cause?

A. STP is blocking the uplink between the access and distribution switches B. The server is in an incorrect VLAN, isolating it from the user segment C. A duplicate IP address exists on the distribution router's interface D. An ACL on the distribution router is blocking inter-VLAN traffic

Question 9

A technician at a university connects a new access switch to the campus network. Users on the switch report a 30-to-50-second delay before getting connectivity after plugging in, even though physical link is established immediately. What is the cause?

A. STP is transitioning the port through listening and learning states before forwarding B. The switch port is in error-disabled state due to a security policy violation C. The DHCP lease time is configured too long, delaying address assignment D. The port is suspended due to a VLAN mismatch on the trunk link

Question 10

A network engineer troubleshooting a branch router confirms all local routing and inter-VLAN communication works correctly. All traffic destined for internet resources is dropped at the branch router. What is the most likely cause?

A. An ACL is blocking outbound traffic on the branch router's WAN interface B. The BGP session between the branch and the ISP router is down C. The branch router is missing a default route pointing to the ISP gateway D. NAT is not configured on the branch router's WAN interface

CompTIA Network+ Practice Test for Subdomain 5.3 #03

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