更新された2023年11月合格させるJN0-251試験リアル練習テスト問題
無料ダウンロードJuniper JN0-251リアル試験問題
質問 # 29
Which statement is correct about a WLAN RF medium?
- A. A WLAN RF is a full duplex, contention free medium where each client transmits on a separate channel.
- B. A WLAN RF is a half-duplex, contention-free medium where the access point polls each station in turn.
- C. A WLAN RF is a full-duplex, contention-free medium where 802.11 stations can transmit and receive at the same time.
- D. A WLAN RF is a half-duplex, shared medium where 802.11 stations contend with each other for access.
正解：D
質問 # 30
What are two characteristics of the 2.4 GHz band when compared to the 5 GHz band? (Choose two.)
- A. less non-Wi-Fi interference
- B. shorter wavelength
- C. lower frequency
- D. more congestion
正解：C、D
解説：
Reference:
The correct answer is B. lower frequency and D. more congestion. These are two characteristics of the 2.4 GHz band when compared to the 5 GHz band. The 2.4 GHz band uses lower frequencies than the 5 GHz band, which means that it can penetrate solid objects better and have more range1. However, the lower frequencies also mean that the 2.4 GHz band has less bandwidth and speed than the 5 GHz band1. The 2.4 GHz band is also more congested than the 5 GHz band, as it has fewer non-overlapping channels and more interference from other devices and routers that use the same frequency band23. The 5 GHz band, on the other hand, has more non-overlapping channels and less interference, which makes it faster and more reliable23.
質問 # 31
Which statement is correct about Mist SLEs?
- A. A Mist classifier is comprised of multiple SLEs.
- B. A Mist SLE is comprised of multiple classifiers.
- C. A Mist classifier is comprised of a single SLE.
- D. A Mist SLE is comprised of a single classifier.
正解：C
質問 # 32
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 define each location's specific information.
- C. The organizational level is where you enable BLE capabilities, if you have a license.
- D. The organizational level is where you specify customer-level global details.
正解：B
質問 # 33
Mist cloud supports single sign-on in which two scenarios? (Choose two.)
- A. admin login to the Mist portal
- B. Wi-Fi guest login access
- C. account login used for NETCONF
- D. account login used for the RESTful API
正解：B、D
質問 # 34
Which two methods are supported for configuring a Mist environment? (Choose two.)
- A. Use the API.
- B. Use NETCONF.
- C. Use the GUI.
- D. Use the CLI.
正解：A、D
質問 # 35
Which device categories are included in WAN Assurance? (Choose two.)
- A. Mist Edge
- B. SSR
- C. SRX
- D. EX
正解：B、C
解説：
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: SSR and SRX. 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 TechLibrary1 or the Juniper Mist WAN Assurance Overview2.
質問 # 36
Which statement is correct about a WLAN RF medium?
- A. A WLAN RF is a full duplex, contention free medium where each client transmits on a separate channel.
- B. A WLAN RF is a half-duplex, contention-free medium where the access point polls each station in turn.
- C. A WLAN RF is a full-duplex, contention-free medium where 802.11 stations can transmit and receive at the same time.
- D. A WLAN RF is a half-duplex, shared medium where 802.11 stations contend with each other for access.
正解：D
解説：
Reference:
According to the Cisco Content Hub1, Wi-Fi is half duplex, meaning we can either transmit (Tx) or receive (Rx) on the medium, the clients and the network take turns accessing the medium. Wi-Fi is contention based, meaning there are rules for stations trying to access the medium and collisions (due to two or more stations simultaneously accessing the medium) are worked out fairly so everyone gets a chance.
質問 # 37
The status of user authentication will affect which pair of SLEs?
- A. Coverage and Roaming
- B. Capacity and Successful Connects
- C. Time to Connect and Throughput
- D. Successful Connects and Time to Connect
正解：B
質問 # 38
What are two characteristics of the 2.4 GHz band when compared to the 5 GHz band? (Choose two.)
- A. less non-Wi-Fi interference
- B. shorter wavelength
- C. lower frequency
- D. more congestion
正解：C、D
質問 # 39
A user device sends signal information to the Mist Location Engine.
In this scenario, what is expected from the Mist Location Engine?
- A. coordinates
- B. product advertisements
- C. login splash page
- D. sensor device information
正解：A
質問 # 40
vBLE engagement works on transmit mode and has 1 m to 3 m accuracy using which feature?
- A. a BLE radio
- B. Wi-Fi enabled devices
- C. the Mist location SDK
- D. Wi-Fi IoT sensors
正解：A
質問 # 41
In a Mist deployment, the Radio Resource Management feature is an example of which type of machine learning?
- A. supervised learning
- B. reinforcement learning
- C. visual learning
- D. unsupervised learning
正解：B
解説：
In a Mist deployment, the Radio Resource Management (RRM) feature is an example of reinforcement learning. Reinforcement learning is a type of machine learning that works on the principle that an agent takes an action which is either penalized or rewarded based on the result in order to reinforce the optimal behavior1.
RRM is a feature that optimizes the wireless network performance and user experience by dynamically adjusting the radio frequency (RF) settings, such as channel, bandwidth, and power, of the access points (APs) based on the changing environmental conditions, such as interference, traffic, or user density2. RRM uses reinforcement learning to learn from the feedback and data collected by the APs and the Mist cloud and to make decisions that improve the network quality of service (QoS) and service level expectations (SLEs)3.
質問 # 42
What are two valid Mist subscription status states in the Mist GUI? (Choose two.)
- A. Expired
- B. Exceeded
- C. Staged
- D. Perpetual
正解：A、D
質問 # 43
You attempt to log in to manage.mist.com, however you receive a 404 error from your browser. You are able to browse other public websites and you suspect a problem with manage.mist.com.
In this scenario, which step would you take to immediately find out the status of the Mist cloud?
- A. Visit https://mist.com/status.
- B. Visit https://support.juniper.net/support/.
- C. Visit https://www.mist.com/support.
- D. Visit https://status.mist.com.
正解：D
質問 # 44
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