2023年最新のに更新された検証済みの合格させるJN0-251学習ガイドベスト問題集を使おう Courses
究極なガイドはJN0-251最新版限定公開
質問 # 31
What are two prerequisites for adopting Juniper switches for Wired Assurance? (Choose two.)
- A. a claim code
- B. an account on manage.mist.com
- C. a Wired Assurance license
- D. an activation code
正解：B、C
解説：
Reference:
Two prerequisites for adopting Juniper switches for Wired Assurance are a Wired Assurance license and an account on manage.mist.com. These are the two essential requirements that enable the cloud-based management and AI features of the Juniper Mist platform for the switches.
A Wired Assurance license is a subscription that allows you to onboard, configure, and monitor your Juniper EX Series Switches from the Juniper Mist cloud. A Wired Assurance license also provides access to the Mist AI engine, which delivers insights, automation, and service-level expectations (SLEs) for your wired network. You can purchase a Wired Assurance license from a Juniper partner or reseller1.
An account on manage.mist.com is a user account that allows you to access the Juniper Mist portal and the Juniper Mist API. The Juniper Mist portal is a web-based interface that lets you manage and troubleshoot your wired and wireless networks from anywhere. The Juniper Mist API is an application programming interface that lets you integrate and automate your network operations with third-party applications and services2.
質問 # 32
In which two Mist configuration levels would you create labels? (Choose two.)
- A. site
- B. organization
- C. switch
- D. location
正解：A、B
質問 # 33
Users are complaining about WLAN performance and the Mist dashboard reports non-Wi-Fi interference.
Which diagnostics tool would you use to further investigate this issue on-site and determine the location of the interference?
- A. WLAN scanner
- B. wireless design software
- C. protocol analyzer
- D. spectrum analyzer
正解：D
解説：
Reference:
The correct answer is A. spectrum analyzer. This is the diagnostics tool that you would use to further investigate the issue of non-Wi-Fi interference on-site and determine the location of the interference. A spectrum analyzer is a device that measures and displays the frequency and amplitude of the electromagnetic signals in a given spectrum1. A spectrum analyzer can help you identify the sources and types of non-Wi-Fi interference, such as microwave ovens, cordless phones, Bluetooth devices, or radar systems, that may affect the WLAN performance2. A spectrum analyzer can also help you locate the interference by showing the signal strength and direction of the interfering signals2.
質問 # 34
Which statement is correct about Bluetooth and BLE?
- A. BLE is a newer technology than Bluetooth.
- B. BLE is an upgrade to Bluetooth.
- C. Bluetooth and BLE use the same radio channels.
- D. Bluetooth and BLE are compatible.
正解：A
質問 # 35
What is an 802.11 management frame transmitted by an AP?
- A. ping
- B. beacon
- C. keepalive
- D. echo request
正解：B
解説：
Reference:
According to the Wikipedia article on 802.11 Frame Types1, a beacon frame is a type of management frame that contains information about the network and is broadcast by the access point (AP) periodically to announce its presence and provide the necessary information for other devices to join the network. A beacon frame includes the following information elements:
Timestamp: a 64-bit value that represents the time when the AP started to transmit the frame.
Beacon Interval: a 16-bit value that indicates the time interval between beacon transmissions, measured in time units (TUs) of 1024 microseconds.
Capability Information: a 16-bit bitmap that specifies the supported features and capabilities of the network, such as encryption, authentication, and power management.
SSID: a variable-length field that contains the name of the network.
Supported Rates: a variable-length field that lists the data rates supported by the network, in units of 500 kbps.
Other optional information elements, such as country code, channel number, HT and VHT operations, RSN settings, and WMM parameters.
質問 # 36
When would be the earliest opportunity to configure an access point (AP)?
- A. after the AP is claimed to inventory
- B. after the AP is online
- C. after you are on the same network as the AP
- D. after the AP is installed
正解：A
解説：
Reference:
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.
質問 # 37
The status of user authentication will affect which pair of SLEs?
- A. Capacity and Successful Connects
- B. Time to Connect and Throughput
- C. Coverage and Roaming
- D. Successful Connects and Time to Connect
正解：D
解説：
The status of user authentication will affect the pair of SLEs: Successful Connects and Time to Connect. These are two of the eight SLEs that Mist provides to measure the wireless network performance and user experience. SLE stands for Service Level Expectation and is a metric that tracks the percentage of time that a specific network condition is met within a given time range.
The Successful Connects SLE measures the percentage of time that the wireless clients can successfully authenticate and associate to the network. The Time to Connect SLE measures the average time that it takes for the wireless clients to complete the authentication and association process. Both of these SLEs depend on the status of user authentication, which is the process of verifying the identity and credentials of the wireless clients.
If the user authentication fails or takes too long, it will negatively affect the Successful Connects and Time to Connect SLEs. The user authentication can fail or take too long due to various reasons, such as incorrect credentials, unsupported encryption type, misconfigured RADIUS server, network congestion, etc. Mist can detect and classify these issues and provide alerts and recommendations to resolve them.
質問 # 38
Which two APIs are supported by Mist? (Choose two.)
- A. gRPC
- B. REST
- C. SOAP
- D. Webhook
正解：B、D
解説：
According to the web search results, the two APIs that are supported by Mist are webhook and REST. A webhook is a way of sending data from the Mist cloud to a third-party application or service when a certain event occurs1. A webhook can be used to integrate Mist with various platforms, such as Slack, Splunk, ServiceNow, or Zapier1. A webhook can also be used to trigger custom actions, such as sending notifications, creating tickets, or updating databases1. You can configure webhooks in the Mist portal by selecting the organization, site, and event type that you want to send data to1.
A REST (Representational State Transfer) is a way of accessing and manipulating data from the Mist cloud using HTTP requests and responses2. A REST API can be used to perform various tasks, such as creating and managing organizations, networks, sites, devices, users, and policies2. A REST API uses JSON or XML as the data format and supports different HTTP methods, such as GET, POST, PUT, and DELETE2. You can use the REST API to automate and customize your Mist environment according to your needs2. You can access the REST API documentation in the Mist portal by clicking on the ? mark in the upper right of the UI2.
質問 # 39
You want to obtain detailed information on a wireless client.
In this scenario, which area would you use to accomplish this task?
- A. Templates
- B. Security
- C. SLEs
- D. Insights
正解：D
質問 # 40
Which two Mist-supported APIs are considered event-driven? (Choose two.)
- A. gRPC
- B. RESTful
- C. Webhook
- D. WebSocket
正解：C、D
解説：
According to the web search results, WebSocket and Webhook are two Mist-supported APIs that are considered event-driven. Event-driven APIs are APIs that allow the server to push information to the client asynchronously, instead of requiring the client to poll the server for updates. Event-driven APIs can provide real-time data, decoupled systems, and improved scalability and performance.
WebSocket is a protocol that enables bidirectional communication between a client and a server over a single TCP connection1. WebSocket allows the server to send messages to the client without waiting for a request, and vice versa1. WebSocket can be used for event-driven APIs that require continuous and interactive data exchange, such as chat applications, online games, or live streaming1.
Webhook is a way of sending data from the server to a third-party application or service when a certain event occurs2. Webhook allows the server to notify the client about an event, such as a new order, a payment confirmation, or a user registration2. Webhook can be used for event-driven APIs that require one-way notifications or integrations with other platforms, such as Slack, Splunk, or ServiceNow2.
質問 # 41
Which statement is correct regarding settings at the organizational level?
- A. The organizational level is where you specify information about each AP's placement.
- B. The organizational level is where you specify customer-level global details.
- C. The organizational level is where you define each location's specific information.
- D. The organizational level is where you enable BLE capabilities, if you have a license.
正解：B
解説：
According to the official Mist documentation1, the organization level contains customer specific details such as name, password and session policies, certificate, and management tunnel. You can also create switch templates and port profiles at the organization level, which can be applied to all the devices in a given group. You can also configure the managed service provider setting at the organization level, if you want to bring independently created Mist organizations under MSP managed umbrella2.
質問 # 42
Mist has detected a bad cable.
What are two ways that Marvis determined this result? (Choose two.)
- A. It identified interface errors.
- B. It identified port flapping.
- C. It identified network loops.
- D. It identified a missing VLAN.
正解：A、B
解説：
Mist has detected a bad cable by using two methods: port flapping and interface errors. These methods are based on the data collected by the Mist access points, switches, and WAN edge devices from the cable statistics, link statistics, link errors, and traffic patterns.
Port flapping is a condition where a port on a switch or a device repeatedly goes up and down, causing network instability and packet loss. Port flapping can be caused by a bad cable that has physical damage, loose connection, or interference. Mist can detect port flapping by monitoring the link status and the number of link state changes on the port.
Interface errors are errors that occur on the interface level of a switch or a device, such as input errors, output errors, frame errors, CRC errors, MTU errors, etc. Interface errors can indicate a bad cable that has poor quality, mismatched speed or duplex settings, or incorrect wiring. Mist can detect interface errors by monitoring the error counters and the error rates on the interface.
質問 # 43
Which two APIs are supported by Mist? (Choose two.)
- A. gRPC
- B. REST
- C. SOAP
- D. Webhook
正解：B、C
質問 # 44
Which two statements are correct about an Organization ID? (Choose two.)
- A. The Organization ID is used to identify the organization when using APIs.
- B. The Organization ID is the encrypted version of the Organization Name field.
- C. The Organization ID is manually defined by the user.
- D. The Organization ID is randomly created by the system.
正解：A、D
解説：
The Organization ID is a unique identifier that is randomly created by the system when you create a new organization in the Mist portal. The Organization ID is used to identify the organization when using APIs, such as the REST API or the GraphQL API. You can find your Organization ID in the Organization > Settings page in the Mist portal12.
The Organization ID is not the encrypted version of the Organization Name field. The Organization Name field is a user-defined name that can be changed at any time. The Organization ID is a system-generated string that cannot be changed.
The Organization ID is not manually defined by the user. The user cannot choose or modify the Organization ID. The user can only create or edit the Organization Name field.
質問 # 45
Which two Mist-supported APIs are considered event-driven? (Choose two.)
- A. gRPC
- B. RESTful
- C. Webhook
- D. WebSocket
正解：C、D
質問 # 46
Which statement defines the total user minutes?
- A. The total amount of device uptime over the last seven days.
- B. The average number of minutes that all clients have been associated to the network.
- C. The total number of minutes between a client's last association and disassociation.
- D. The total number of minutes for which Mist has statistics for each client.
正解：C
質問 # 47
Which machine learning method involves rewarding and punishing an agent?
- A. deep learning
- B. unsupervised learning
- C. supervised learning
- D. reinforcement learning
正解：D
解説：
This is a machine learning method that involves rewarding and punishing an agent for its actions in an environment. The agent learns by trial and error to maximize the rewards and minimize the penalties. This is how Mist AI performs Radio Resource Management (RRM) to optimize the RF radio waves that transmit network traffic in wireless LANs1.
質問 # 48
Mist cloud supports single sign-on in which two scenarios? (Choose two.)
- A. admin login to the Mist portal
- B. account login used for the RESTful API
- C. account login used for NETCONF
- D. Wi-Fi guest login access
正解：A、D
解説：
According to the web search results, Mist cloud supports single sign-on (SSO) in two scenarios: Wi-Fi guest login access and admin login to the Mist portal. SSO is a feature that allows users to log in to multiple applications or services with one set of credentials, without having to enter them repeatedly1. SSO can provide convenience, security, and efficiency for users and administrators1.
Wi-Fi guest login access is a scenario where users can access the Wi-Fi network as guests using their existing social media or email accounts, such as Facebook, Google, or LinkedIn2. Mist cloud supports SSO for Wi-Fi guest login access by integrating with various identity providers (IdPs), such as Azure AD, Okta, Ping Identity, or OneLogin2. Mist cloud can also use webhooks to send guest login data to third-party applications or services, such as Slack, Splunk, or ServiceNow2.
Admin login to the Mist portal is a scenario where administrators can access the Mist dashboard using their existing corporate accounts, such as Office 365, G Suite, or Active Directory3. Mist cloud supports SSO for admin login to the Mist portal by integrating with various IdPs, such as Azure AD, Okta, Ping Identity, or OneLogin3. Mist cloud can also use the REST API to automate and customize the admin login process3.
質問 # 49
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.)
- A. the access point to which the client was connected
- B. user home address
- C. the MAC address of the client device
- D. the time of the incident
正解：C、D
質問 # 50
Where in the Mist UI would the Persistently Failing Clients report be found?
- A. Successful Connects SLE
- B. Insights
- C. Marvis Actions
- D. Alerts
正解：B
質問 # 51
Which two methods are supported for configuring a Mist environment? (Choose two.)
- A. Use the GUI.
- B. Use the API.
- C. Use NETCONF.
- D. Use the CLI.
正解：B、D
質問 # 52
What happens when Mist subscriptions expire?
- A. Devices retain their configurations but the Mist user is prevented from accessing the Mist management GUI.
- B. Devices retain their configurations but Mist management GUI functionality related to expired subscriptions are not configurable by the user.
- C. Devices retain their configurations for 90 days; if the subscriptions are not renewed, the configuration is deleted and the devices are reset to factory default.
- D. Devices retain their configurations and all Mist management GUI functionality remains available to the user.
正解：B
質問 # 53
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2023年最新のに更新された検証済みの合格させるJN0-251試験にはリアル問題解答：https://drive.google.com/open?id=1hyLpKnYvuBm1WQ3HF5jEmjVs3v0J1Q6f