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NEW QUESTION # 18
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.
NEW QUESTION # 19
A network engineer manages a guest wireless network in an airport with mostly transient users.
There is a fixed pool of available IP addresses. Which of the following DHCP properties should the engineer configure to reduce the likelihood that this pool will be exhausted?
Answer: A
Explanation:
Shortening the DHCP lease time allows IP addresses assigned to transient guest users to return to the available pool more quickly, reducing the chance that the address pool will be exhausted.
NEW QUESTION # 20
A network administrator wants to configure a backup route in case the primary route fails. A dynamic routing protocol is not installed on the router. Which of the following routing features should the administrator choose to accomplish this task?
Answer: D
Explanation:
Introduction to Administrative Distance
Administrative distance (AD) is a value used by routers to rank routes from different routing protocols. AD represents the trustworthiness of the source of the route. Lower AD values are more preferred. If a router has multiple routes to a destination from different sources, it will choose the route with the lowest AD.
Static Routes and Backup Routes
When a dynamic routing protocol is not used, static routes can be employed. Static routes are manually configured routes. To ensure a backup route, multiple static routes to the same destination can be configured with different AD values.
Configuring Static Routes with Administrative Distance
The primary route is configured with a lower AD value, making it the preferred route. The backup route is configured with a higher AD value. In the event of the primary route failure, the router will then use the backup route.
Example Configuration:
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ip route 192.168.1.0 255.255.255.0 10.0.0.1 1
ip route 192.168.1.0 255.255.255.0 10.0.0.2 10
In the above example, 192.168.1.0/24 is the destination network.
10.0.0.1 is the next-hop IP address for the primary route with an AD of 1.
10.0.0.2 is the next-hop IP address for the backup route with an AD of 10.
Verification:
After configuration, use the show ip route command to verify that the primary route is in use and the backup route is listed as a candidate for use if the primary route fails.
Reference:
CompTIA Network+ guide explains the concept of administrative distance and its use in static routing configuration (see page Ref 9†Basic Configuration Commands).
NEW QUESTION # 21
A network administrator recently upgraded a wireless infrastructure with new APs. Users are reporting that, when stationary, the wireless connection drops and reconnects after 20 to 30 seconds. While reviewing the logs, the administrator notices that the APs are changing channels.
Which of the following is the most likely reason for the service interruptions?
Answer: C
Explanation:
If APs are changing channels frequently, it indicates automatic channel selection due to interference. This can cause temporary disconnections as the APs switch frequencies.
NEW QUESTION # 22
Which of the following, in addition to a password, can be asked of a user for MFA?
Answer: C
Explanation:
MFA (Multi-Factor Authentication) requires factors from different categories:
Something you know # Password, PIN
Something you have # Smart card, hardware (hard) token
Something you are # Biometric
The correct second factor is a hard token.
A). PIN = something you know (same factor as password).
B). Favorite color = knowledge-based, same factor as password.
D). Mother's maiden name = weak knowledge-based, same factor as password.
References (CompTIA Network+ N10-009):
Domain: Network Security - Authentication methods, MFA categories.
NEW QUESTION # 23
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