Free Juniper JN0-251 Exam Actual Questions

The questions for JN0-251 were last updated On Feb 19, 2025

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Question No. 1

In a production network, what are two types of security threats? (Choose two.)

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Correct Answer: A, C

A rogue AP is an unauthorized access point that is installed on a network without the knowledge or consent of the network administrator. A rogue AP can pose a serious security threat to a network, as it can allow attackers to bypass the network's security policies and gain access to sensitive data or launch other attacks. A rogue AP can also interfere with the performance of the legitimate APs and cause network congestion or degradation.

A scanning radio is a device that can scan the wireless spectrum and detect the presence and characteristics of wireless networks. A scanning radio can be used for legitimate purposes, such as network monitoring, troubleshooting, or optimization. However, a scanning radio can also be used for malicious purposes, such as discovering vulnerable networks, capturing network traffic, or launching denial-of-service attacks. A scanning radio can pose a security threat to a network, as it can expose the network's SSID, encryption type, channel, and signal strength.


Question No. 2

A user called a help desk to report a Wi-Fi issue.

In this scenario, what information must be provided for Marvis to troubleshoot the issue? (Choose two.)

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Correct Answer: B, C

A user called a help desk to report a Wi-Fi issue. In this scenario, the information that must be provided for Marvis to troubleshoot the issue arethe MAC address of the client deviceandthe time of the incident. These are two of the essential parameters that Marvis needs to identify and analyze the wireless client and its connection history.

The MAC address of the client device is a unique identifier that allows Marvis to locate and track the client on the wireless network. The MAC address can be found on the device settings, label, or sticker, depending on the device type. The MAC address can also be obtained from the Mist portal or the Mist AI App by searching for the client name or IP address.

The time of the incident is the approximate date and time when the user experienced the Wi-Fi issue. The time of the incident can help Marvis narrow down the scope of the troubleshooting and focus on the relevant data and events. The time of the incident can be specified in various formats, such as ''today'', ''yesterday'', ''last week'', ''10 minutes ago'', ''5 pm'', etc.

To troubleshoot a Wi-Fi issue using Marvis, you can use phrases such as ''troubleshoot client <MAC address> on <time>'' or ''how was client <MAC address> on <time>'' in the Marvis Conversational Assistant window. Marvis will show you the details of the client's connection status, performance, issues, and recommendations.


Question No. 3

Which device categories are included in WAN Assurance? (Choose two.)

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Correct Answer: C, D

WAN Assurance is a cloud-based service that provides visibility and insights into the WAN performance and user experience. WAN Assurance supports two device categories:SSRandSRX. SSR stands for Session Smart Router, which is a software-defined WAN (SD-WAN) solution that delivers high-performance, secure, and reliable connectivity for distributed enterprises. SRX stands for Services Gateway, which is a next-generation firewall (NGFW) that provides advanced security and threat prevention for branch and remote locations.

WAN Assurance does not support EX or Mist Edge devices. EX is a series of Ethernet switches that provide high-performance, scalable, and secure switching for campus and data center networks. Mist Edge is a device that extends the Mist Cloud to the edge of the network, enabling local processing of WLAN functions, such as authentication, encryption, and firewall.

You can find more information about WAN Assurance in the Juniper TechLibrary1or the Juniper Mist WAN Assurance Overview2.


Question No. 4

What are two valid Mist subscription status states in the Mist GUI? (Choose two.)

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Correct Answer: A, D