Free Practice Questions for CompTIA N10-009 Exam

Band steering is a feature in wireless networks that encourages dual-band capable devices to connect to the 5GHz band instead of the 2.4GHz band.

Why Band Steering?

The 5GHz band supports higher speeds and less interference compared to 2.4GHz.

If a device supports both bands, the access point (AP) can " steer " it to connect to 5GHz instead of 2.4GHz.

This helps ensure users always connect to the fastest available network.

Incorrect Options:

B. Disabling the 5GHz SSID: Would force devices onto 2.4GHz, which is slower and more congested.

C. Adding a Captive Portal: Used for guest authentication, not for speed optimization.

D. Configuring MAC Filtering: Used for security, not for optimizing network speed.

Temperature and humidity controlis the best way to reduce the risk of electrostatic discharge (ESD). Dry environments significantly increase the likelihood of static buildup, which can discharge and damage sensitive components. By controlling humidity, the environment becomes less prone to static electricity.

Network segmentation involves dividing a network into smaller segments or subnets. This is particularly important when integrating OT (Operational Technology) devices to ensure that these devices are isolated from other parts of the network. Segmentation helps protect the OT devices from potential threats and minimizes the impact of any security incidents. It also helps manage traffic and improves overall network performance.References: CompTIA Network+ study materials.

A content filter blocks access to specific websites based on category, URL, or keywords. This is the best solution to restrict gambling websites.

Breakdown of Options:

A. ACLs – Control network access, not specific web content.

B. Content filter – ✅ Correct answer. Used to block access to unwanted websites.

C. Port security – Prevents unauthorized device connections, not web traffic filtering.

D. Screened subnet – A DMZ isolates public-facing servers, not user restrictions.

Understanding TTL (Time to Live):

TTL is a value in a DNS record that tells how long that record should be cached by DNS servers and clients. A higher TTL value means that the record will be cached longer, reducing the load on the DNS server but delaying the propagation of changes.

Impact of TTL on DNS Changes:

When an MX record change is made, it may take time for the change to propagate across all DNS servers due to the TTL setting. If the TTL is high, old DNS information might still be cached, leading to email being directed to the old server.

Best Practice Before Making DNS Changes:

To ensure that changes to DNS records propagate quickly, it is recommended to reduce the TTL value to a lower value (such as 300 seconds or 5 minutes) well in advance of making the changes. This ensures that any cached records will expire quickly, and the new records will be used sooner.

Verification of DNS Changes:

After reducing the TTL and making the change to the MX record, it is important to verify the propagation using tools like dig or nslookup.

Comparison with Other Options:

Change the email client configuration to match the MX record: Email clients generally do not need to match the MX record directly; they usually connect to a specific mail server specified in their settings.

Perform a DNS zone transfer prior to the MX record change: DNS zone transfers are used to replicate DNS records between DNS servers, but they are not related to the propagation of individual record changes.

Update the NS record to reflect the IP address change: NS records specify the DNS servers for a domain and are not related to MX record changes.

Packet loss occurs when network packets fail to reach their destination, leading to disruptions in connectivity and performance issues. In this scenario:

Users report connectivity issues and lag during video meetings.

The administrator detects increased retransmissions in tcpdump, which is a strong indicator of lost packets that must be resent.

Video meetings are particularly sensitive to packet loss, leading to buffering, frozen screens, and dropped calls.

Latency (Option A) refers to delayed data transmission but does not necessarily cause retransmissions.

Bottlenecking (Option C) happens when a network component (e.g., router, switch) cannot handle the traffic load, but packet retransmissions are more directly related to packet loss.

Jitter (Option D) affects the consistency of packet arrival times, but the symptoms described here are more aligned with packet loss rather than timing variations.

? Reference: CompTIA Network+ (N10-009) Official Study Guide – Section: Troubleshooting Connectivity Issues

When configuring a firewall, the first step is identifying which ports, protocols, and services are required for normal business operations. This ensures only legitimate traffic is allowed. After establishing the required rules, a default deny rule is added for security.

B. Deny all rule is important, but it should come after defining required rules.

C. VPN access is a service to configure, but only after determining baseline needs.

D. Outbound traffic policies are part of refinement, not the first consideration.

References (CompTIA Network+ N10-009):

Domain: Network Security — Firewall configuration, rule order, least privilege.

If the user cannot communicate with 192.168.10.1, they might be on a different subnet. Changing the subnet mask to 255.255.255.0 ensures the user and the file server are in the same subnet.

Breakdown of Options:

A. Changing the IPv4 address to 192.168.10.1 – This would conflict with the server ' s IP.

B. Changing the subnet mask to 255.255.255.0 – ✅ Correct answer. Ensures both the user and the server are on the same subnet.

C. Changing the DNS servers – DNS does not affect local network connectivity.

D. Changing the physical address – The MAC address does not impact subnet communication.

A large number of collisions and input errors typically indicates a duplex mismatch, such as when one device is set to full duplex and the other to half duplex. This leads to communication issues and poor performance. The document explains:

“Collisions and input errors are clear signs of duplex mismatches… typically caused when one device operates in half duplex while the other is in full duplex, causing performance and connectivity issues.”

•A. Isolate smart devices to their own network segment: Network segmentation using VLANs or separate SSIDs ensures that smart devices (like speakers) are not on the same network as guests, preventing unauthorized control.

•E. Change the default credentials: Many IoT devices (e.g., smart speakers) come with default usernames and passwords. If these are not changed, unauthorized users can easily take control.

•Why not the other options?

•B. Configure IPS: IPS (Intrusion Prevention System) detects threats but cannot block specific guest actions on an IoT device.

•C. Install a new AP: A new access point does not solve the unauthorized control issue.

•D. Set up a syslog server: Helps with logging, but does not prevent unauthorized access.

•F. Configure GRE: Generic Routing Encapsulation (GRE) is used for VPN tunneling, which is irrelevant in this case.

Using a /30 subnet mask is the most efficient way to conserve IP space for a point-to-point connection between two routers. A /30 subnet provides four IP addresses, two of which can be assigned to the router interfaces, one for the network address, and one for the broadcast address. This makes it ideal for point-to-point links where only two usable IP addresses are needed.References: CompTIA Network+ study materials and subnetting principles.

A signal power of -97dB indicates a very weak signal, which can cause connectivity issues and slow speeds. Splitters on a coaxial line can degrade the signal quality further, so removing them can help improve the signal strength and overall connection quality.

Signal Quality: Splitters can reduce the signal strength by dividing the signal among multiple lines, which can be detrimental when the signal is already weak.

Direct Connection: Ensuring a direct connection from the modem to the incoming line can maximize signal quality and reduce potential points of failure.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Discusses troubleshooting connectivity issues and the impact of signal strength on network performance.

Cisco Networking Academy: Provides insights on maintaining optimal signal quality in network setups.

Network+ Certification All-in-One Exam Guide: Covers common network issues, including those related to signal degradation and ways to mitigate them.

SFTP (Secure File Transfer Protocol) operates over port 22, using SSH (Secure Shell) encryption for secure file transfers.

Breakdown of Options:

A. 22 – Correct answer. SFTP runs over SSH (port 22) for secure file transfers.

B. 80 – Used for HTTP, not SFTP.

C. 443 – Used for HTTPS (secure web traffic).

D. 3389 – Used for RDP (Remote Desktop Protocol).

Comprehensive and Detailed Explanation (aligned to N10-009):

An ad hoc wireless network allows devices to connect directly to each other without an access point. This is suitable for small, temporary setups like two laptops and a printer.

A. Mesh requires multiple nodes forming a larger distributed network.

B. Infrastructure requires an AP, which is not available here.

D. Point-to-point is typically for long-distance wireless links between two fixed endpoints.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Wireless network types: infrastructure, ad hoc, mesh.