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NEW QUESTION # 551
A company experiences an incident involving a user who connects an unmanaged switch to the network.
Which of the following technologies should the company implement to help avoid similar incidents without conducting an asset inventory?
Answer: B
Explanation:
Port security is a Layer 2 security feature that restricts the number of devices connecting to a network switch port. It helps prevent unauthorized devices, such as an unmanaged switch, from being connected to the network.
How Port Security Works:
Limits the number of MAC addresses that can connect to a port.
Can shut down or restrict the port if an unauthorized device is detected.
Prevents users from plugging in unauthorized networking equipment (e.g., unmanaged switches, hubs).
Incorrect Options:
A: Screened Subnet: A screened subnet (DMZ) is used for isolating external-facing servers, not for controlling unauthorized network connections.
B: 802.1X: Provides authentication for devices but requires a RADIUS server, which is a more complex solution than port security.
C: MAC Filtering: Controls which MAC addresses can connect but is difficult to manage and can be spoofed.
Reference:
CompTIA Network+ N10-009 Official Study Guide - Chapter on Network Security Controls
NEW QUESTION # 552
A user submits an escalated ticket regarding failed logins on their laptop. The user states that the time displayed on the laptop is incorrect. An administrator thinks the issue is related to the NTP. Which of the following should the administrator do next?
Answer: B
Explanation:
The first step of troubleshooting is always to identify the problem, which includes verifying the symptoms (incorrect time), asking the user clarifying questions, and checking system logs. Only after confirming the problem can the administrator proceed to form a theory and plan.
A . Plan of action is later.
B . Implement solution comes after testing a theory.
D . Test the theory requires a defined problem first.
Reference (CompTIA Network+ N10-009):
NEW QUESTION # 553
A systems administrator is looking for operating system information, running services, and network ports that are available on a server. Which of the following software tools should the administrator use to accomplish this task?
Answer: B
Explanation:
To identify a server's available network ports, running services, and often operating system details, the best tool listed is nmap. In the Network+ (N10-009) toolset, nmap is a standard utility used for network discovery and security assessment, including port scanning (which TCP/UDP ports are open), service enumeration (what application/service is listening on those ports), and service/version detection. With the appropriate scan options and permissions, nmap can also provide OS fingerprinting, which estimates the server's operating system by analyzing responses to crafted packets.
The other options do not meet all stated requirements. nslookup is used for DNS queries (name-to-IP and record lookups) and does not enumerate ports/services. traceroute (or tracert) maps the path packets take through the network to a destination and helps diagnose routing/latency issues, not services/ports. netstat shows local socket statistics on the host where it is executed (active connections, listening ports, and interface stats), but it does not reliably provide remote OS identification and is not a dedicated service/OS enumeration scanner like nmap.
Therefore, nmap is the correct tool to accomplish the task as described.
NEW QUESTION # 554
Which of the following protocols is used to route traffic on the public internet?
Answer: C
Explanation:
Border Gateway Protocol (BGP) is the primary protocol used to route traffic on the public internet.
It allows ISPs and large networks to exchange routing information, making it an Exterior Gateway Protocol (EGP).
NEW QUESTION # 555
Which of the following steps of the troubleshooting methodology would most likely include checking through each level of the OSI model after the problem has been identified?
Answer: B
Explanation:
Introduction to Troubleshooting Methodology:
Network troubleshooting involves a systematic approach to identifying and resolving network issues. The CompTIA Network+ certification emphasizes a structured troubleshooting methodology.
Troubleshooting Steps:
Identify the problem: Gather information, identify symptoms, and question users.
Establish a theory of probable cause: Consider possible reasons for the issue.
Test the theory to determine cause: Validate the theory with tests.
Establish a plan of action to resolve the problem and implement the solution: Create and execute a resolution plan.
Verify functionality and implement preventive measures: Ensure the solution works and prevent recurrence.
Verifying Functionality:
After implementing a solution, verifying functionality ensures that the problem is fully resolved. This involves testing the network to confirm that it operates correctly.
Checking through each level of the OSI model helps to ensure that all potential issues at different layers (physical, data link, network, transport, session, presentation, and application) are addressed.
Explanation of the Options:
A . Establish a theory: This step involves hypothesizing possible causes, not verifying functionality.
B . Implement the solution: This step involves executing the resolution plan.
C . Create a plan of action: This step involves planning the resolution, not verification.
D . Verify functionality: This step involves comprehensive checks, including OSI model layers, to ensure the issue is fully resolved.
Conclusion:
Verifying functionality is a critical step in the troubleshooting process, ensuring that the network operates correctly after a solution is implemented. It involves thorough testing across all OSI model layers.
Reference:
CompTIA Network+ guide explaining the troubleshooting methodology and the importance of verifying functionality (see page Ref 9 Basic Configuration Commands).
NEW QUESTION # 556
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