Pass the CompTIA CompTIA Network+ N10-009 Questions and answers with CertsForce

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. Replacing the transceiver may eventually be necessary, but only after verifying correct connections.

B. Restarting the switchport won’t resolve a physical misconnection.

D. Using multimode fiber would be incorrect here, as the link was designed for single-mode (10 miles/16 km requires SMF).

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Fiber connectivity, Tx/Rx alignment, link light diagnostics.

Disabling unused ports prevents unauthorized access and reduces the attack surface by ensuring that no inactive or unmonitored entry points are available for exploitation. Changing default passwords is critical for security because default credentials are widely known and can easily be exploited by attackers. These techniques are fundamental steps in hardening devices against unauthorized access and ensuring network security. References: CompTIA Network+ Exam Objectives and official study guides.

When a host fails to obtain an IP address from a DHCP server, it assigns itself an APIPA (Automatic Private IP Addressing) address in the 169.254.x.x range, commonly described as a “self-assigned IP.” This prevents communication outside the local link, including reaching the default gateway.

B. RFC1918 addresses are private ranges (10.x.x.x, 172.16–31.x.x, 192.168.x.x), but these are not self-assigned.

C. If the TCP/IP stack were disabled, the host wouldn’t have any IP at all.

D. If a static IP were assigned, it would show a configured value, not self-assigned.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — IP addressing issues, DHCP failures, APIPA behavior.

The correct answer is Switch because the question references a new logical layout segmenting the network using tagging, which indicates VLAN (Virtual Local Area Network) configuration. VLAN tagging (IEEE 802.1Q) is performed on switches to logically separate broadcast domains within the same physical infrastructure.

According to CompTIA Network+ (N10-009) objectives under switching technologies, VLANs are used to improve security, reduce broadcast traffic, and logically segment network traffic. When VLAN tagging is misconfigured—such as incorrect trunk ports, access port assignments, or mismatched VLAN IDs—devices may lose connectivity to required network resources.

Since the issue began after changes involving tagging, the most likely cause is an incorrect switch configuration, such as improper VLAN assignments or trunking settings.

An access point (Option A) may use VLANs for SSID segmentation, but core tagging configuration is handled at the switch. A firewall (Option B) filters traffic but does not control VLAN tagging at Layer 2 in typical deployments. A load balancer (Option D) distributes traffic among servers and is unrelated to VLAN segmentation.

Therefore, reviewing the switch configuration is the appropriate action to restore connectivity.

The most likely reason an insurance brokerage would enforce VPN usage is to encrypt sensitive data in transit. VPNs (Virtual Private Networks) create a secure tunnel between the user ' s device and the corporate network, ensuring that data is encrypted and protected from interception.

Encryption: VPNs encrypt data, preventing unauthorized access and ensuring data privacy during transmission over public or unsecured networks.

Data Protection: Essential for industries handling sensitive information, such as insurance brokerages, to protect customer data and comply with regulatory requirements.

Security: Enhances overall network security by providing secure remote access for employees.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Discusses the role of VPNs in securing data in transit.

Cisco Networking Academy: Provides training on VPN technologies and their importance in data security.

Network+ Certification All-in-One Exam Guide: Explains VPN usage and its benefits in protecting sensitive information.

(Note: Ips will be change on each simulation task, so we have given example answer for the understanding)

To perform a network discovery by entering commands into the terminal, you can use the following steps:

Click on each switch to open its terminal window.

Enter the command show ip interface brief to display the IP addresses and statuses of the switch interfaces.

Enter the command show vlan brief to display the VLAN configurations and assignments of the switch interfaces.

Enter the command show cdp neighbors to display the information about the neighboring devices that are connected to the switch.

Fill in the missing information in the diagram using the drop-down menus provided.

Here is an example of how to fill in the missing information for Core Switch 1:

The IP address of Core Switch 1 is 192.168.1.1.

The VLAN configuration of Core Switch 1 is VLAN 1: 192.168.1.0/24, VLAN 2: 192.168.2.0/24, VLAN 3: 192.168.3.0/24.

The neighboring devices of Core Switch 1 are Access Switch 1 and Access Switch 2.

The interfaces that connect Core Switch 1 to Access Switch 1 are GigabitEthernet0/1 and GigabitEthernet0/2.

The interfaces that connect Core Switch 1 to Access Switch 2 are GigabitEthernet0/3 and GigabitEthernet0/4.

You can use the same steps to fill in the missing information for Access Switch 1 and Access Switch 2.

An evil twin is a rogue Wi-Fi access point that mimics a legitimate network. Attackers use it to intercept and manipulate traffic, making it an on-path (formerly MITM) attack opportunity.

Breakdown of Options:

A. Phishing – Tries to steal credentials through fake emails/websites but does not intercept network traffic.

B. Dumpster diving – Involves physical security breaches, not network interception.

C. Evil twin – ✅ Correct answer. A rogue Wi-Fi AP impersonates a real network, allowing traffic interception.

D. Tailgating – Involves physical access security, not network interception.

When a new VLAN is created, it typically exists on a different subnet. If DHCP servers are on a different VLAN, the network needs an IP helper address to forward DHCP requests correctly. Without it, clients in the new VLAN won’t receive an IP address.

Breakdown of Options:

A. Scope size – Increasing the DHCP scope would not resolve the issue if requests aren ' t reaching the server.

B. Address reservations – Reservations only assign specific addresses to devices; they do not fix DHCP communication issues.

C. Lease time – Changing the lease time does not impact DHCP functionality across VLANs.

D. IP helper – Correct answer. This forwards DHCP requests across VLANs to the DHCP server.

OSPF (Open Shortest Path First) is a link-state routing protocol that uses the Dijkstra algorithm, also known as the shortest path first (SPF) algorithm, to determine the most efficient routes.

From Andrew Ramdayal’s guide:

“OSPF is a link-state routing protocol that provides fast, efficient path selection using the shortest path first (SPF) algorithm.”

The correct answer is Modify the CNAME record because a CNAME (Canonical Name) record maps one domain name (alias) to another domain name. If a user enters www.abc.com but is redirected to www.cba.com, it is likely that the DNS configuration includes an incorrect CNAME entry pointing abc.com to cba.com. Updating or correcting the CNAME record ensures the alias resolves to the intended host.

According to CompTIA Network+ (N10-009) objectives covering DNS record types, a CNAME record is used to alias one domain name to another, commonly for load balancing, CDN services, or website redirection.

A PTR record (Option B) is used for reverse DNS lookups (IP address to hostname) and does not control forward name resolution for websites. NTP settings (Option C) are used for time synchronization and have no impact on DNS resolution. A TXT record (Option D) stores descriptive text information (such as SPF, DKIM, or domain verification data) and does not affect website redirection.

Therefore, correcting the CNAME record resolves the issue and ensures users reach the correct website.

GDPR (General Data Protection Regulation)is alegal frameworkenforced by the European Union to protect personal data and privacy. Unlike internal organizational policies such as AUPs or codes of conduct, GDPR is alegislated regulation, and organizations must comply or face legal consequences.

An evil twin attack is when an attacker sets up a rogue access point (AP) with the same SSID as a legitimate one to trick users into connecting. Once users connect, attackers often present fake login pages or capture unencrypted session data to steal login credentials.

A. DNS poisoning manipulates DNS resolution but is not inherent to evil twin.

C. ARP spoofing is a Layer 2 attack involving MAC/IP mapping manipulation.

D. Denial of service can be a side effect but is not the primary objective of evil twin attacks.

The main purpose of an evil twin is credential theft, enabling further unauthorized access to networks or systems.

References (CompTIA Network+ N10-009):

Domain: Network Security — Wireless attacks, rogue APs, evil twins.

The correct answer is B. Active-passive approach. CompTIA Network+ N10-009 includes high availability and disaster recovery concepts such as failover, redundancy, and recovery strategies. An active-passive approach uses a primary production system, site, or service that actively handles traffic, while a secondary standby environment remains ready to take over if the primary environment fails. This design helps ensure data center services can be restored and made accessi ble quickly after a disaster because the standby environment is already planned and prepared for failover.

Backup and replication software is important for data protection, but backups alone do not guarantee that services will be quickly available. Restoring systems from backups may require significant time. Cloud computing can support disaster recovery, but it is a broad deployment model rather than a specific recovery strategy. Remote manual failover can restore services, but manual failover usually takes longer and increases the chance of administrative delay or error.

Because the question emphasizes quickly restored and accessible services after a disaster, an active-passive approach is the most appropriate option. It provides a standby recovery environment designed to assume operations when the active data center service becomes unavailable.