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

Link Layer Discovery Protocol (LLDP) is a network protocol used for discovering devices and their capabilities on a local area network, primarily at the data link layer (Layer 2). It helps in identifying the connected switch and the specific port to which a device is connected. When troubleshooting a VoIP handset connection, the technician can use LLDP to determine the exact switch and port where the handset is connected. This protocol is widely used in network management to facilitate the discovery of network topology and simplify troubleshooting.

Other options such as IKE (Internet Key Exchange), VLAN (Virtual LAN), and netstat (network statistics) are not suitable for identifying the switch and port information. IKE is used in setting up secure IPsec connections, VLAN is used for segmenting networks, and netstat provides information about active connections and listening ports on a host but not for discovering switch port details.

Definition of a Rogue DHCP Server:

A rogue DHCP server is an unauthorized DHCP server on a network, which can assign IP addresses to devices without proper control, leading to IP address conflicts.

Impact of a Rogue DHCP Server:

IP Address Conflicts: Multiple devices may receive the same IP address from different DHCP servers, causing network connectivity issues.

Network Disruption: Devices may be assigned incorrect network configuration settings, disrupting network services and connectivity.

Comparison with Other Attacks:

DNS poisoning: Alters DNS records to redirect traffic to malicious sites, but does not cause IP address conflicts.

Social engineering: Involves manipulating individuals to gain unauthorized access or information, not directly related to IP address conflicts.

Denial-of-service (DoS): Floods a network or service with excessive traffic to disrupt operations, but does not cause duplicate IP addresses.

Prevention and Detection:

Implement network access control measures to prevent unauthorized devices from acting as DHCP servers.

Use DHCP snooping on switches to allow DHCP responses only from authorized DHCP servers.

Asymmetrical routing occurs when packets take different paths to and from the destination, leading to instability in network communication. The use of two different MPLS providers with OSPF can lead to this type of routing issue, especially if the paths aren ' t carefully configured and managed. This can cause unexpected routing behaviors and instability in a dual-WAN setup. (Reference: CompTIA Network+ Study Guide, Chapter on Network Routing)

SSO (Single Sign-On) allows an organization to use an identity provider (IdP) to centrally manage authentication and access across multiple SaaS applications. In the Network+ (N10-009) objectives, identity and access management concepts include federated authentication, centralized account control, and reducing password sprawl. With SSO, users authenticate once to the IdP, and the IdP then provides assertions/tokens to SaaS services (commonly using federation standards such as SAML or OIDC in real environments). This improves security (fewer reused passwords, easier MFA enforcement), streamlines user experience, and simplifies administration (provisioning/deprovisioning from one place).

PKI supports certificates and encryption/signing, but it is not the core mechanism for managing access across many SaaS apps via an IdP. TACACS+ is typically used for device administration (AAA) on network equipment, and RADIUS commonly supports network access (802.1X, VPN) AAA—both are important AAA protocols but do not describe the SaaS-wide “one login across many apps” capability. Therefore, SSO is the best answer.

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When dealing with troubleshooting and change management, the plan of action outlines the steps, risks, and mitigation strategies. A change advisory board (CAB) uses this documented plan to decide whether to approve the change.

A. Identify the problem is the first step in troubleshooting, not decision-making for CAB.

B. Develop a theory is diagnostic work, not planning.

C. Test the theory confirms causes but doesn’t provide actionable planning information.

References (CompTIA Network+ N10-009):

Domain: Network Operations — Change management, troubleshooting methodology, CAB processes.

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.

Secure Shell (SSH) is a protocol used to securely access remote devices over an unsecured network. It provides encrypted command-line access and is a lightweight and secure method of remote administration.

A. Site-to-site VPN connects entire networks, not just a single host.

B. Telnet is not secure; it transmits data (including credentials) in plaintext.

C. Console access is direct via serial cable, not remote.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 2.6 – Configure and troubleshoot remote access.

A subinterface is a logical interface created on a single physical router interface that allows routing between VLANs (known as Router-on-a-Stick (ROAS)). This method is commonly used when only one physical router is available, allowing inter-VLAN communication without additional hardware.

•Why not the other options?

•VXLAN (B) – This is used for extending Layer 2 networks over a Layer 3 infrastructure, primarily in data centers. It does not directly enable inter-VLAN communication.

•Layer 3 switch (C) – A Layer 3 switch can route between VLANs, but the scenario states that purchasing additional hardware is not an option.

•VIR (D) – This is not a standard networking term in the context of VLAN communication.

Understanding Subnetting:

Original Network: 192.168.1.0/24 has a subnet mask of 255.255.255.0, which allows for 256 IP addresses (including network and broadcast addresses).

Objective: Divide this network into two equal subnets.

Calculating Subnet Mask:

New Subnet Mask: To divide 192.168.1.0/24 into two equal halves, we need to borrow one bit from the host portion of the address, changing the subnet mask to 255.255.255.128 (/25).

Subnet Breakdown:

First Subnet: 192.168.1.0/25 (192.168.1.0 - 192.168.1.127)

Second Subnet: 192.168.1.128/25 (192.168.1.128 - 192.168.1.255)

Verification:

Each subnet now has 128 IP addresses (126 usable IP addresses, excluding the network and broadcast addresses).

Comparison with Other Options:

255.255.0.0 (/16): Provides a much larger network, not dividing the original /24 network.

255.255.254.0 (/23): Also creates a larger subnet, encompassing more than the original /24 network.

255.255.255.0 (/24): Maintains the original subnet size, not dividing it.

Understanding End-of-Support:

End-of-Support Status: When a vendor declares a device as end-of-support, it means the device will no longer receive updates, patches, or technical support. This poses a security risk as new vulnerabilities will not be addressed.

Risks of Keeping an End-of-Support Device:

Security Vulnerabilities: Without updates, the switch becomes susceptible to new security threats.

Compliance Issues: Many regulatory frameworks require that critical infrastructure be maintained with supported and secure hardware.

Best Next Step - Replacement:

Decommission and Replace: The most secure approach is to replace the end-of-support switch with a new, supported model. This ensures the infrastructure remains secure and compliant with current standards.

Planning and Execution: Plan for the replacement by evaluating the network ' s needs, selecting a suitable replacement switch, and scheduling downtime for the hardware swap.

Comparison with Other Options:

Apply the Latest Patches: While helpful, this does not address future vulnerabilities since no further patches will be provided.

Ensure the Current Firmware Has No Issues: This is only a temporary measure and does not mitigate future risks.

Isolate the Switch from the Network: Isolating the switch may disrupt network operations and is not a viable long-term solution.

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.

The longest prefix match is a routing concept used to find the most specific route to a destination IP address. The routing table performs this calculation to determine the exit interface for a packet, ensuring the most accurate delivery. The document explains:

“Routers use the longest prefix match when searching the routing table to determine the best path for an IP packet. This ensures that the most specific (and thus optimal) route is chosen, based on the destination IP address.”

VLAN hopping is an attack where an attacker crafts packets with multiple VLAN tags, allowing them to traverse VLAN boundaries improperly. This can result in gaining unauthorized access to network segments that are supposed to be isolated. The other options do not involve the use of multiple network tags. MAC flooding aims to overwhelm a switch’s MAC address table, DNS spoofing involves forging DNS responses, and ARP poisoning involves sending fake ARP messages.

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

Multitenancy is a cloud concept where multiple customers share the same physical resources (servers, storage, and networks) but remain logically separated for security and privacy.

A. Elasticity is auto-scaling resources.

B. Hybrid cloud combines private and public resources.

C. Scalability is the ability to grow resources but doesn’t imply multiple customers.

References (CompTIA Network+ N10-009):

Domain: Networking Concepts — Cloud computing models, multitenancy in public cloud.