N10-009 Free Practice Questions — Page 12 (2026)

Question 111

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:
A sealed enclosure restricts airflow, making heat buildup the primary physical installation concern. Network switches have operating temperature limits, and excessive heat can cause degraded performance, shutdowns, or hardware failure. While power budget, humidity, and fire suppression may matter in some environments, temperature is the most critical factor specifically due to the sealed enclosure.

Question 112

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

A. NTP

B. FTP

C. DHCP

D. LDAP

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Correct Answer: C

Explanation:
DHCP (Dynamic Host Configuration Protocol) is the server/service responsible for automatically assigning and managing IP addresses and related network configuration for clients. NTP synchronizes time, FTP transfers files, and LDAP provides directory services. Sources: https://www.zenarmor.com/docs/network-basics/types-of-servers https://www.spiceworks.com/networking/what-is-a-server https://www.comptia.org/en-us/blog/what-is-dhcp-dynamic-host-configuration-protocol

Question 113

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 is a rogue Wi-Fi access point that impersonates a legitimate network to lure users into connecting. Its primary objective is to intercept traffic and steal sensitive information such as usernames and passwords (login credentials). DNS poisoning, ARP spoofing, and denial of service are different attack techniques or objectives.

Question 114

Clients report that phones are down. The network technicians determine that PCs and printers are online. However, the phones display the message Searching for service. Which of the following should the technicians check first?

A. PoE statistics on the switch

B. DHCP options

C. Data VLANs on switchports

D. The default gateway on the switch

Show Answer

Correct Answer: B

Explanation:
The phones are powered on but cannot find or register with the voice service, while PCs and printers on the data network are functioning. This indicates basic network connectivity is present. A common first check is the DHCP configuration for voice devices, specifically the required DHCP options (such as Option 66 or 150, depending on the deployment) that tell IP phones where to locate the TFTP/call manager server. PoE is unlikely because the phones are powered, the data VLAN is already working for PCs/printers, and the switch's default gateway would not selectively affect only phone registration.

Question 115

A company reports that their facsimile machine no longer has a dial tone when trying to send a fax. The phone cable is damaged on one end. Which of the following types of connectors should a technician replace?

A. F-type

B. RJ45

C. SC

D. RJ11

Show Answer

Correct Answer: D

Explanation:
A fax machine connects to a standard analog telephone line using an RJ11 modular connector. A damaged phone cable end should be replaced with an RJ11 connector. F-type is for coaxial cable, RJ45 is for Ethernet, and SC is a fiber-optic connector.

Question 116

Which of the following could provide a lightweight and private connection to a remote box?

A. Site-to-site VPN

B. Telnet

C. Console

D. Secure Shell

Show Answer

Correct Answer: D

Explanation:
Secure Shell (SSH) provides an encrypted (private), lightweight remote command-line connection. Telnet is unencrypted, a site-to-site VPN connects networks rather than providing direct remote shell access, and a console connection is typically local rather than remote.

Question 117

A network engineer is troubleshooting connectivity for a newly installed server on an existing VLAN. The engineer reviews the following requested output: The engineer then logs in to the router and runs the following: Which of the following describes the issue?

A. The server has an incorrect subnet mask.

B. There is a duplicate IP address on the network.

C. The DHCP address pool is exhausted.

D. The router is missing a default route.

Show Answer

Correct Answer: A

Explanation:
The issue is an incorrect subnet mask. A host configured with a /27 mask on a network where the router interface is using a /24 will calculate a different local subnet and fail to reach devices it should consider local, causing connectivity problems despite being on the correct VLAN.

Question 118

A network administrator recently configured an autonomous wireless AP and performed a throughput test via comptiaspeedtester.com. The result was 75Mbps. When connected to other APs, the results reached 500Mbps. Which of the following is most likely the reason for this difference?

A. Channel width configuration

B. DNS server issues

C. Authentication failure

D. Incorrect DHCP settings

Show Answer

Correct Answer: A

Explanation:
A throughput of about 75 Mbps on one autonomous AP versus about 500 Mbps on others is most consistent with a wireless radio configuration difference, particularly a narrower channel width (for example, 20 MHz instead of 80 MHz). DNS, DHCP, and authentication issues affect name resolution, IP assignment, or connectivity rather than consistently capping wireless throughput at this level.

Question 119

A company is installing network cables above the ceiling tiles. The cables must be fire rated. Which of the following cable types should the company use?

A. Coaxial

B. Plenum

C. Crossover

D. STP

Show Answer

Correct Answer: B

Explanation:
Plenum-rated cable is designed for installation in plenum spaces such as above suspended ceilings used for air circulation. It has a fire-resistant, low-smoke jacket that meets building fire code requirements. The other options describe cable types or wiring configurations that do not specifically indicate plenum fire rating.

Question 120

Several unauthorized APs near the corporate headquarters are broadcasting similar SSIDs. Which of the following types of attacks is being described?

A. Evil twin

B. Wi-Fi jamming

C. On-path

D. Wardriving

Show Answer

Correct Answer: A

Explanation:
An evil twin attack involves a rogue wireless access point broadcasting the same or a very similar SSID as a legitimate network to lure users into connecting. Wi-Fi jamming disrupts wireless communications, on-path (man-in-the-middle) refers to intercepting communications rather than creating a fake AP, and wardriving is the act of searching for wireless networks.