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Juniper JN0-251 Exam

Exam Name: Mist AI, Associate Exam
Exam Code: JN0-251 JNCIA-MistAI
Related Certification(s): Juniper Mist AI Certification Certification
Certification Provider: Juniper
Actual Exam Duration: 90 Minutes
Number of JN0-251 practice questions in our database: 77 (updated: May. 12, 2024)
Expected JN0-251 Exam Topics, as suggested by Juniper :
  • Topic 1: Juniper Mist Configuration Basics/ Benefits of using cloud-based management
  • Topic 2: Factory default configurations and network connection prerequisites/ Juniper Mist capabilities and use cases
  • Topic 3: Benefits and features of Juniper Mist Wi-Fi Assurance/ Benefits and features of Juniper Mist WAN Assurance
  • Topic 4: Identify the concepts or functionality of Mist AI accounts/ Juniper Mist Cloud Fundamentals
  • Topic 5: Juniper Location Services, driven by Mist AI/ Identify the options of the Juniper Mist help menu
  • Topic 6: Creation and management of user accounts/ Juniper Mist cloud user/account authentication methods
  • Topic 7: Capabilities of different account roles/ Identify the concepts or functionality of Mist AI advanced configurations
  • Topic 8: Juniper Mist Network Operations and Management/ Creation and management of Juniper Mist organizations and sites
  • Topic 9: Identify the concepts or components of location-based services (LBS)/ Identify the concepts or components of Juniper Mist APIs
  • Topic 10: Benefits and features of Juniper Mist Wired Assurance/ Identify the concepts or functionality of Mist AI initial configurations
  • Topic 11: Juniper Mist Monitoring and Analytics/ Identify fundamental concepts about the Juniper Mist cloud-native architecture
  • Topic 12: Service-level expectations (SLEs)/ Identify concepts or functionality of Juniper Mist wired network management and operations features
  • Topic 13: Identify concepts or functionality of Juniper Mist wireless network management and operations features/ Claiming and onboarding devices
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Free Juniper JN0-251 Exam Actual Questions

Note: Premium Questions for JN0-251 were last updated On May. 12, 2024 (see below)

Question #1

You are troubleshooting a signal strength issue when you notice that the signal strength changes from -70 to -73 dBm as you move from one room to another.

In this scenario, what is happening?

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Correct Answer: B

According to the Wikipedia article on dBm1, a 10 dB increase in level is equivalent to a ten-fold increase in power, and a 10 dB decrease in level is equivalent to a ten-fold decrease in power. Therefore, a 3 dB change in level is approximately equivalent to doubling or halving the power.

In this scenario, the signal strength has changed from -70 dBm to -73 dBm, which is a 3 dB decrease in level. This means that the signal strength has halved, or decreased by 50%. To calculate the ratio of the signal strengths, we can use the following formula:

fracP1P2=10fracx1x210

where P1 and P2 are the powers in mW, and x1 and x2 are the levels in dBm. Plugging in the values from the scenario, we get:

fracP1P2=10frac70(73)10=10frac310approx1.995

This means that the power at -70 dBm is about 2 times higher than the power at -73 dBm, or equivalently, the power at -73 dBm is about 0.5 times lower than the power at -70 dBm.


Question #3

You are troubleshooting a signal strength issue when you notice that the signal strength changes from -70 to -73 dBm as you move from one room to another.

In this scenario, what is happening?

Reveal Solution Hide Solution
Correct Answer: B

According to the Wikipedia article on dBm1, a 10 dB increase in level is equivalent to a ten-fold increase in power, and a 10 dB decrease in level is equivalent to a ten-fold decrease in power. Therefore, a 3 dB change in level is approximately equivalent to doubling or halving the power.

In this scenario, the signal strength has changed from -70 dBm to -73 dBm, which is a 3 dB decrease in level. This means that the signal strength has halved, or decreased by 50%. To calculate the ratio of the signal strengths, we can use the following formula:

fracP1P2=10fracx1x210

where P1 and P2 are the powers in mW, and x1 and x2 are the levels in dBm. Plugging in the values from the scenario, we get:

fracP1P2=10frac70(73)10=10frac310approx1.995

This means that the power at -70 dBm is about 2 times higher than the power at -73 dBm, or equivalently, the power at -73 dBm is about 0.5 times lower than the power at -70 dBm.


Question #4

When would be the earliest opportunity to configure an access point (AP)?

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Correct Answer: D

This is the earliest opportunity to configure an access point (AP) in the Juniper Mist cloud.According to the Juniper Mist documentation1, the steps to configure an AP are as follows:

Claim the AP to inventory: This step involves entering the serial number or MAC address of the AP in the Juniper Mist cloud portal, which will add the AP to the inventory and assign it a subscription.

Assign the AP to a site: This step involves selecting a site from the inventory and dragging and dropping the AP to the site. This will apply the site-level settings and policies to the AP.

Configure the AP settings: This step involves editing the AP settings, such as name, location, labels, templates, and radio profiles. This can be done individually or in bulk for multiple APs.

Question #5

Which statement is correct about a WLAN RF medium?

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