N10-009 Exam Dumps - CompTIA Network+ Questions and Answers

For 45 hosts, the minimum subnet size must allow at least 46 usable addresses (1 each for network and broadcast addresses).

A /26 subnet provides 64 addresses, 62 usable — suitable.

A /27 subnet gives only 30 usable — insufficient.

A /25 offers 126 usable — more than needed.

A /28 provides just 14 — too small.

So, the most efficient subnet with minimal wastage is /26.

From Andrew Ramdayal’s guide:

“When designing subnets, always choose the smallest subnet mask that still accommodates all hosts. A /26 provides 62 usable host addresses, suitable for networks with about 50 hosts.”

The troubleshooting methodology requires following a logical sequence. In this case, the engineer has already identified the problem (firewall blocking traffic) and confirmed it with evidence (packet captures). The next appropriate step is to create a plan of action that outlines how to resolve the issue and considers potential effects.

A. Implementing the solution is premature without planning.

C. Establishing a theory was already completed during problem isolation.

D. Documentation occurs after resolution.

By carefully planning, the engineer ensures that corrective action won’t cause additional outages or security issues, especially given the scale of the incident (3,000 users).

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Troubleshooting methodology, plan of action.

TLS (Transport Layer Security) is the protocol that provides encryption in transit for HTTPS. It ensures data is encrypted between the client (browser) and the web server, protecting it from interception or tampering.

A. SSH is used for secure terminal access, not HTTPS.

C. SCADA refers to control systems, not encryption protocols.

D. RADIUS is an authentication protocol, not for encrypting HTTPS traffic.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 4.2 – Identify common security threats and vulnerabilities.

CompTIA Network+ N10-009 Official Objectives: 4.6 – Explain authentication and access controls.

Since the switch supports only 10Gbps per port, achieving 40Gbps throughput requires link aggregation (LACP), which combines multiple 10Gbps links into one logical interface for higher bandwidth.

Breakdown of Options:

A. 802.1Q tagging – VLAN tagging helps segment traffic but does not increase throughput.

B. Jumbo frames – Jumbo frames reduce overhead but do not increase bandwidth.

C. Half duplex – Half duplex restricts communication, reducing performance instead of improving it.

D. Link aggregation – Correct answer. LACP combines multiple 10Gbps links to provide a 40Gbps connection.

BYOD (Bring Your Own Device) policies define rules for using personal devices on the company network. Since the new employee is using a personal laptop, this policy applies.

Breakdown of Options:

A. IAM (Identity and Access Management) – Governs user permissions, not device policies.

B. BYOD (Bring Your Own Device) – ✅ Correct answer. Covers using personal devices for work.

C. DLP (Data Loss Prevention) – Focuses on preventing sensitive data leaks, not device usage policies.

D. AUP (Acceptable Use Policy) – Covers internet and system usage, but not personal device rules.

Understanding Spanning Tree Protocol (STP):

STP is used to prevent network loops in Ethernet networks by creating a spanning tree that selectively blocks some redundant paths.

Default Priority Value:

Bridge Priority: STP uses bridge priority to determine which switch becomes the root bridge. The default bridge priority value for most switches is 32768.

Priority Range: The bridge priority can be set in increments of 4096, ranging from 0 to 61440.

Configuration and Verification:

When deploying a new switch, the network administrator can verify the bridge priority using commands such as show spanning-tree to ensure it is set to the default value of 32768.

Comparison with Other Values:

4096 and 8192: Lower than the default priority, indicating these would be manually configured for higher preference.

36684: A non-standard value, likely a result of specific configuration changes.

Understanding 2.4GHz Interference:

The 2.4GHz frequency range is commonly used by many devices, including Wi-Fi, Bluetooth, and various industrial equipment. This can lead to interference and degraded performance.

Mitigation Strategies:

5GHz Frequency:

The 5GHz frequency band offers more channels and less interference compared to the 2.4GHz band. Devices operating on 5GHz are less likely to encounter interference from other devices, including industrial equipment.

Non-overlapping Channels:

In the 2.4GHz band, using non-overlapping channels (such as channels 1, 6, and 11) can help reduce interference. Non-overlapping channels do not interfere with each other, providing clearer communication paths for Wi-Fi signals.

Why Other Options are Less Effective:

Mesh Network: While useful for extending network coverage, a mesh network does not inherently address interference issues.

Omnidirectional Antenna: This type of antenna broadcasts signals in all directions but does not mitigate interference.

Captive Portal: A web page that users must view and interact with before accessing a network, unrelated to frequency interference.

Ad Hoc Network: A decentralized wireless network that does not address interference issues directly.

Implementation:

Switch Wi-Fi devices to the 5GHz band if supported by the network infrastructure and client devices.

Configure Wi-Fi access points to use non-overlapping channels within the 2.4GHz band to minimize interference.

•nslookup allows querying DNS records to verify if the new server is correctly resolving domain names.

•ping (A) tests basic connectivity, not DNS configuration.

•tracert (B) shows network path latency but doesn’t test DNS.

•tcpdump (C) captures packets but isn’t ideal for DNS verification.

????Reference: CompTIA Network+ N10-009 Official Documentation – DNS Testing Tools.

When signal strength is poor, mobile devices constantly boost their transmission power in an attempt to maintain a stable connection. This results in dropped calls/data and rapid battery drain. Since a repeater was installed, misalignment or misconfiguration could be degrading the signal strength.

A. WPS applies to Wi-Fi, not cellular repeaters.

C. Channel frequency might matter for interference, but signal strength is the most direct cause of the described symptoms.

D. Power budget applies to PoE and wired devices, not mobile phones.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Wireless/cellular troubleshooting, signal strength impact, user symptoms (battery drain, poor connectivity).

The loopback address (127.0.0.1) is used to test a host’s local TCP/IP stack, ensuring that the networking components of the operating system are functioning properly.

This test does not require network connectivity because it only checks if the local machine's TCP/IP stack is operational.

If the loopback test fails, it indicates a misconfigured TCP/IP stack, corrupt drivers, or an issue with the OS networking components.

Option B (ping 169.254.1.1) – This is an APIPA (Automatic Private IP Addressing) address, which is assigned when DHCP fails. It does not test the local TCP/IP stack.

Option C (ping 172.16.1.1) and Option D (ping 192.168.1.1) – These are private network addresses and test connectivity to other devices, not the local TCP/IP stack.

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

URL filtering can block access to websites based on their domain or country code TLDs (e.g., .cn, .ru). This is the correct method to block by location identifiers in URLs.

B. Content filtering blocks based on keywords or categories within websites, not country code.

C. DNS poisoning is an attack, not a control mechanism.

D. MAC filtering restricts devices, not websites.

References (CompTIA Network+ N10-009):

Domain: Network Security — Filtering technologies, URL vs content filtering.

A client-to-site VPN (remote-access VPN) is designed to let an individual user securely connect into an organization’s network over an untrusted network (like the internet) and access resources as if the user were locally connected. Network+ objectives emphasize VPNs as encrypted tunnels that provide confidentiality and integrity for traffic, commonly using technologies such as IPsec or SSL/TLS-based VPNs. With a client-to-site VPN, the user’s device establishes a tunnel to the corporate VPN gateway, receives routes (and sometimes DNS settings), and can reach internal subnets and cloud resources according to policy.

A jump box/host is a hardened intermediate system used to access sensitive segments, but it does not make the user’s device behave as if it is directly on the network; it provides controlled administrative access. SSH is a secure remote management protocol for connecting to a host’s command line—useful for administration, not full network access to multiple internal resources. A GRE tunnel provides encapsulation but does not provide encryption by itself, so it is not inherently “securely access” unless combined with additional security (e.g., GRE over IPsec). Therefore, client-to-site VPN is the correct choice.

The correct solution is to configure the connecting ports as trunk ports. When connecting switches, the uplink ports must be configured to carry traffic for multiple VLANs (trunking), not just a single access VLAN. Without trunking, VLAN tags may be dropped, and traffic from hosts will not reach the rest of the network or internet.

B. STP cables is a misnomer — STP refers to Spanning Tree Protocol or Shielded Twisted Pair cables, neither of which solves this logical configuration issue.

C. PoE budget is irrelevant because switches and hosts in this context don’t require PoE.

D. Link aggregation (LACP, EtherChannel) is for increasing bandwidth/redundancy across multiple links, not required with a single cable.

By enabling trunking on the uplink ports, the switches can pass VLAN-tagged traffic, ensuring hosts connected to the new switch have access to the same resources as those on the existing switch.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — VLAN trunking, inter-switch connectivity.

Installing server equipment in a rack increases compute density by allowing multiple servers to be organized efficiently in a vertical configuration, saving space while housing more devices in a smaller footprint. This is critical for data centers and businesses with high hardware demands.

Simplified troubleshooting process (A): While racks can aid in organizing equipment, this is a secondary benefit, not the primary purpose.

Decreased power consumption (B): Rack installation does not directly reduce power usage; equipment power consumption remains the same.

Improved network performance (C): Racking servers does not inherently improve network performance; that depends on network configurations.