Practice quiz

Network+ Fundamentals Quiz

Scenario-based original review questions about VLANs, subnetting, routing, switching, DNS, DHCP, gateways, and troubleshooting tools.

Original review questions for learning and self-checking. These are not real exam questions.

Easy

1. A small office wants guest Wi-Fi separated from staff devices while using the same access point hardware. Which concept best supports this?

A. VLANs with appropriate firewall rules

B. One larger DHCP scope only

C. A different DNS suffix only

D. Renaming the guest SSID only

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Correct answer: A. VLANs with appropriate firewall rules.

Explanation: VLANs can separate traffic logically, while firewall rules control access. The other options do not segment networks.

Easy

2. A PC can reach devices in its own subnet but cannot reach the internet. Which setting is most important to check?

A. Default gateway

B. DNS suffix only

C. DHCP lease duration only

D. Client hostname only

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Correct answer: A. Default gateway.

Explanation: The gateway routes traffic out of the local subnet. The other settings do not control routing.

Medium

3. A switch connects PCs in the same office VLAN. A router/firewall connects that VLAN to the internet. Which statement is best?

A. Switching handles local LAN forwarding; routing moves traffic between networks

B. Switching and routing are always the same task

C. Routing is only DNS name lookup

D. Switching is only wireless authentication

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Correct answer: A. Switching handles local LAN forwarding; routing moves traffic between networks.

Explanation: This separates LAN switching from inter-network routing. The wrong options confuse unrelated concepts.

Medium

4. A device is 192.168.5.25/24 with gateway 192.168.6.1. Other devices use gateway 192.168.5.1. What is likely wrong?

A. Gateway is not in the local subnet

B. DNS server is public

C. DHCP lease is too short

D. Hostname is not descriptive

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Correct answer: A. Gateway is not in the local subnet.

Explanation: With /24, 192.168.6.1 is outside 192.168.5.0/24. The other facts do not explain the routing issue.

Medium

5. Clients on a new VLAN get no IP addresses. The DHCP server works for other VLANs. What is a likely missing piece?

A. DHCP scope/relay or firewall/router interface for that VLAN

B. Only a new DNS suffix

C. A client browser reset

D. A printer test page

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Correct answer: A. DHCP scope/relay or firewall/router interface for that VLAN.

Explanation: Each VLAN/subnet needs a way to receive DHCP. Peripherals do not explain missing leases.

Medium

6. A user can ping the gateway and ping 8.8.8.8 but cannot browse by website names. Which tool is most useful next?

A. nslookup

B. chkdsk

C. Device Manager display adapter

D. Print Management only

Show answer

Correct answer: A. nslookup.

Explanation: Connectivity by IP works, so DNS testing is next. Disk, display, and print tools do not test name resolution.

Medium

7. A connection works on Ethernet but fails on Wi-Fi in one classroom. Other classrooms are fine. What is the best first scope-based theory?

A. Local AP, SSID, signal, or VLAN issue in that classroom

B. A global internet outage affecting every room

C. A storage issue on every laptop in that classroom

D. A domain password policy issue affecting printing only

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Correct answer: A. Local AP, SSID, signal, or VLAN issue in that classroom.

Explanation: The issue is wireless and location-specific. The other choices are too broad or unrelated.

Medium

8. A tracert to a cloud service stops after the local gateway, but other sites work. What is the best interpretation?

A. It is a clue for routing/filtering/provider path investigation, not proof of one exact cause

B. The client has low disk space

C. DNS should be changed immediately without more tests

D. The print queue is paused

Show answer

Correct answer: A. It is a clue for routing/filtering/provider path investigation, not proof of one exact cause.

Explanation: Tracert results need context; timeouts can be filtering or routing behavior. The other answers ignore the network symptom.

Hard

9. A homelab trunk port carries VLAN 10 and 20 to an access point. Clients on SSID mapped to VLAN 30 get APIPA. What is the best fix direction?

A. Allow/configure VLAN 30 on the trunk and ensure DHCP exists for VLAN 30

B. Replace all laptops

C. Change the SSID name only

D. Run chkdsk on the AP

Show answer

Correct answer: A. Allow/configure VLAN 30 on the trunk and ensure DHCP exists for VLAN 30.

Explanation: The SSID uses VLAN 30 but the trunk does not carry it. Laptop replacement, renaming, and disk checks do not fix VLAN/DHCP path.

Hard

10. A small business has two subnets that should not fully trust each other, but one printer must be reachable from both. What is the best general approach?

A. Use routing/firewall rules to allow only the needed printer access

B. Put every device in one flat network with no rules

C. Disable DHCP everywhere

D. Ask users to email print jobs to each other

Show answer

Correct answer: A. Use routing/firewall rules to allow only the needed printer access.

Explanation: Controlled inter-subnet access is better than flattening or disabling core services. The other choices reduce security or usability.

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