N10-009 Free Practice Questions — Page 5 (2026)

Question 37

Which of the following stages of the troubleshooting methodology involves considering multiple approaches?

A. Verify full functionality.

B. Implement the solution.

C. Document the findings and actions.

D. Establish a theory of probable cause.

Show Answer

Correct Answer: D

Explanation:
In standard troubleshooting methodology (e.g., CompTIA), the stage that involves considering multiple possible causes or approaches is **establishing a theory of probable cause**. At this step, you brainstorm and evaluate different explanations for the problem before testing them. The other options occur after a cause has already been identified or a solution applied.

Question 38

A network technician is configuring the company's network 100Mbps port Layer 2 switches. The technician wants increased throughput for the uplinks between switches. The technician connects multiple redundant links between the switches. Which of the following should the technician configure?

A. Spanning Tree Protocol

B. Switch Virtual Interfaces

C. Native VLAN

D. First Hop Redundancy Protocol

Show Answer

Correct Answer: A

Explanation:
The scenario describes adding redundant switch-to-switch links. While true increased throughput would require link aggregation (e.g., EtherChannel/LACP), that option is not provided. With multiple redundant Layer 2 links present, the technician must configure Spanning Tree Protocol to manage those links and prevent switching loops. The other options (SVIs, Native VLAN, FHRP) are unrelated to switch-to-switch uplink redundancy or throughput. Therefore, given the available choices, Spanning Tree Protocol is the correct answer.

Question 39

Which of the following will a router prioritize first in the route selection process?

A. Prefix length

B. Metric

C. Administrative distance

D. Default route

Show Answer

Correct Answer: A

Explanation:
Routers first apply longest prefix match when selecting a route. The most specific prefix (longest subnet mask) is always preferred before considering administrative distance or metric. Administrative distance is only compared among routes to the same prefix from different sources, and metric is only compared within the same protocol. A default route is used only if no more specific prefix exists.

Question 40

A network administrator is creating a copy of network traffic for later analysis. The flow of traffic should not be changed. Which of the following will most directly accomplish this task?

A. SPAN port

B. Network tap

C. Protocol analyzer

D. Link aggregation

Show Answer

Correct Answer: B

Explanation:
A network tap is a passive, in-line hardware device that creates an exact copy of network traffic for monitoring or analysis without altering the traffic flow. Unlike a SPAN port or protocol analyzer, it does not rely on switch configuration or active processing that could impact traffic, making it the most direct and reliable solution.

Question 41

A network engineer added more APs to improve wireless coverage. However, users now report that the connectivity disconnects and reconnects repeatedly. Which of the following is causing the issue?

A. Throughput capacity

B. Roaming misconfiguration

C. Channel overlap

D. Packet loss

Show Answer

Correct Answer: C

Explanation:
Adding more APs without proper channel planning causes overlapping channels and co-/adjacent-channel interference, especially in 2.4 GHz. This interference leads to unstable connections with frequent disconnects and reconnects.

Question 42

A network technician is working on a PC with a faulty NIC. The host is connected to a switch with secured ports. After testing the connection cables and using a known good NIC. the host is still unable to connect to the network. Which of the following is causing the connection issue?

A. MAC address of the new card

B. BPDU guard settings

C. Link aggregation settings

D. PoE over power budget

Show Answer

Correct Answer: A

Explanation:
The switch uses secured ports (port security), which typically bind the port to a specific MAC address. Replacing the faulty NIC introduces a new MAC address, causing the switch to block the connection because the MAC no longer matches the allowed one.

Question 43

A network engineer is installing new PoE wireless APs. The first five APs deploy successfully, but the sixth one fails to start. Which of the following should the engineer investigate first?

A. Signal strength

B. Duplex mismatch

C. Power budget

D. CRC

Show Answer

Correct Answer: C

Explanation:
Power over Ethernet switches have a maximum total power budget. When multiple PoE devices are connected, the cumulative wattage can be exhausted. If the first five access points consume most or all of the available PoE budget, the sixth AP may not receive sufficient power to start, making the power budget the first thing to investigate.

Question 44

Which of the following physical installation factors would be the most important when a network switch is installed in a sealed enclosure?

A. Fire suppression

B. Power budget

C. Temperature

D. Humidity

Show Answer

Correct Answer: C

Explanation:
In a sealed enclosure there is little to no airflow, so heat generated by the switch cannot dissipate. Temperature management is therefore the most critical factor, as excessive heat can quickly cause throttling, failures, or shutdown. Fire suppression, power budget, and humidity are less immediately impacted by a sealed design than heat buildup.

Question 45

Which of the following server types is responsible for IP address management for clients?

A. NTP

B. FTP

C. DHCP

D. LDAP

Show Answer

Correct Answer: C

Explanation:
DHCP (Dynamic Host Configuration Protocol) is responsible for automatically assigning and managing IP addresses and related network configuration for clients. NTP handles time synchronization, FTP handles file transfers, and LDAP provides directory services.

Question 46

Which of the following objectives does an evil twin achieve?

A. DNS poisoning

B. Login credentials

C. ARP spoofing

D. Denial of service

Show Answer

Correct Answer: B

Explanation:
An evil twin attack involves setting up a rogue wireless access point that mimics a legitimate one to trick users into connecting. Once connected, the attacker can intercept traffic and capture login credentials or other sensitive information. DNS poisoning, ARP spoofing, and denial of service are separate attack techniques, not the primary objective of an evil twin.