Practice Free N10-009 Exam Online Questions
A network analyst is installing a wireless network in a corporate environment. Employees are required to use their domain identities and credentials to authenticate and connect to the WLAN.
Which of the following actions should the analyst perform on the AP to fulfill the requirements?
- A . Enable MAC security.
- B . Generate a PSK for each user.
- C . Implement WPS.
- D . Set up WPA3 protocol.
D
Explanation:
WPA3-Enterprise provides strong security and supports authentication using domain identities through a RADIUS server and 802.1X authentication. This is the best choice for a corporate environment requiring user-based authentication.
WPA3-Enterprise Benefits:
Uses 802.1X with EAP (Extensible Authentication Protocol) to authenticate users via a directory service (e.g., Active Directory).
Eliminates shared passwords (PSK) for authentication.
Provides strong encryption and resistance to brute-force attacks.
Incorrect Options:
Which of the following Layer 1 devices is responsible for the termination of fiber-optic connections on an SFP-capable switch?
- A . Transceiver
- B . Modem
- C . Ethernet NIC
- D . Repeater
A
Explanation:
A transceiver is the correct answer because it is the Layer 1 (Physical Layer) component that physically terminates and converts fiber-optic signals on an SFP-capable switch. In CompTIA Network+ N10-009 objectives, transceivers―such as SFP, SFP+, QSFP, and QSFP+ modules―are explicitly identified as physical interface components that handle signal transmission and reception. These modules convert electrical signals from the switch into optical signals for fiber cabling (and vice versa), enabling communication over different media types and distances.
A modem is also a Layer 1 device, but its purpose is to modulate and demodulate signals for WAN technologies such as DSL or cable―it does not terminate fiber connections on switches. An Ethernet NIC provides network access for end devices like computers and servers and typically terminates copper Ethernet, not modular fiber interfaces on switches. A repeater regenerates and amplifies signals to extend cable distances but does not provide fiber termination or media conversion at a switch port.
According to Network+ standards, SFP transceivers are essential for flexible network design, allowing administrators to select appropriate fiber types (single-mode or multi-mode), wavelengths, and distances while remaining compliant with physical layer requirements.
A network engineer is testing a website to ensure it is compatible with IPv6. After attempting to ping the website by its IPv6 address, the engineer determines that the DNS has not been set up properly.
Which of the following should the network engineer complete to resolve this issue?
- A . Enable a PTR record.
- B . Update the existing TXT record.
- C . Add a new AAAA record.
- D . Configure a secondary NS record.
C
Explanation:
• AAAA records map domain names to IPv6 addresses, enabling proper resolution.
• PTR records (A) are for reverse DNS lookups.
• TXT records (B) store text-based information, not IP addresses.
• NS records (D) define authoritative name servers but don’t directly affect IPv6 resolution.
Reference: CompTIA Network+ N10-009 Official Documentation C DNS Configuration & IPv6.
Which of the following protocols is commonly associated with TCP port 443?
- A . Telnet
- B . SMTP
- C . HTTPS
- D . SNMP
C
Explanation:
TCP port 443 is reserved for HTTPS (Hypertext Transfer Protocol Secure), which uses TLS encryption to secure web traffic. It is the standard port for encrypted web communications.
An ISP provided a company with a pre-configured modem and five public static IP addresses.
Which of the following does the company’s firewall require to access the internet? (Select TWO).
- A . NTP server
- B . Default gateway
- C . The modem’s IP address
- D . One static IP address
- E . DNS servers
- F . DHCP server
B,D
Explanation:
To access the internet using static IPs, the firewall (or router) must be configured correctly:
B. Default gateway: This is essential because it tells the firewall where to send outbound traffic destined for outside the local network.
D. One static IP address: The firewall must be assigned one of the static IPs to communicate over the public internet.
The other options are not essential for basic internet connectivity in this context:
Two network switches at different locations are connected via fiber-optic cable at a distance of 10 miles (16 km). The duplex fiber-optic patch cord between the patch panel and switch is accidentally pinched, stopping connectivity between the two switches. A network technician replaces the broken cable with a new, single-mode patch cord. However, connectivity between both switches is still down and the link lights are still off.
Which of the following actions should the technician perform first?
- A . Replace the fiber-optic transceiver in the switch
- B . Log in to the switch to shut down and re-enable the switchport
- C . Transpose the two fiber connectors at one end of the new patch cord
- D . Swap the single-mode fiber patch cord with a multimode fiber patch cord
C
Explanation:
Fiber connections require Tx on one end to connect to Rx on the other end. If the patch cord is replaced and link lights remain off, the most common cause is that the connectors are reversed. Swapping (transposing) the connectors ensures proper transmit/receive alignment.
A network administrator needs to set up a multicast network for audio and video broadcasting.
Which of the following networks would be the most appropriate for this application?
- A . 172.16.0.0/24
- B . 192.168.0.0/24
- C . 224.0.0.0/24
- D . 240.0.0.0/24
C
Explanation:
Understanding Multicast:
Multicast IP Address Range: The multicast address range is from 224.0.0.0 to 239.255.255.255, designated for multicast traffic.
Multicast Applications:
Use Case: Multicast is used for one-to-many or many-to-many communication, suitable for applications like audio and video broadcasting where the same data is sent to multiple recipients simultaneously.
Appropriate Network Selection:
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
D
Explanation:
Fax machines use analog phone lines, which are connected using RJ11 connectors. These are standard telephone connectors with 4 or 6 positions and are used for POTS (Plain Old Telephone Service) lines.
F-type is used for coaxial cables (e.g., TV and cable modems).
RJ45 is used for Ethernet network connections.
SC (Subscriber Connector) is used for fiber optic connections, not analog telephone lines.
Reference: CompTIA Network+ N10-009 Official Objectives: 2.4 C Compare and contrast common network connectors.
SIMULATION
A network technician needs to resolve some issues with a customer’s SOHO network. The customer reports that some of the PCs are not connecting to the network, while others appear to be working as intended.
INSTRUCTIONS
Troubleshoot all the network components.
Review the cable test results first, then diagnose by clicking on the appropriate PC, server, and Layer 2 switch.
Identify any components with a problem and recommend a solution to correct each problem.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Explanation:
A computer network diagram with many boxes and text AI-generated content may be incorrect.
Which of the following is the best way to keep devices on during a loss of power?
- A . UPS
- B . Power load
- C . PDU
- D . Voltage
A
Explanation:
A UPS (Uninterruptible Power Supply) provides backup power to devices during a power outage, allowing for continuous operation and protecting against sudden shutdowns that could cause data loss or equipment damage.
The document confirms:
“A UPS (Uninterruptible Power Supply) is essential for maintaining power to critical devices during an outage, protecting data and ensuring continuous operation until power is restored or a safe shutdown can be performed.”