Juniper JN0-252 Practice Test Questions, Exam Dumps

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JN0-252 Juniper Practice Test Questions and Exam Dumps

Question No 1:

Which statement describes Marvis Actions?

Options:

A. It is a dashboard that highlights actionable items.
B. It is a dashboard that details actions taken by the Marvis AI.
C. It is a dashboard that describes user actions.
D. It is a dashboard that lists the actions taken by wireless users.

Answer: B. It is a dashboard that details actions taken by the Marvis AI.

Explanation:

Marvis is a virtual network assistant powered by AI from Mist Systems, which is part of Juniper Networks. It helps administrators by analyzing large amounts of data, providing insights, and making intelligent recommendations based on network performance. The term "Marvis Actions" refers to the actions that Marvis, as an AI, takes based on its analysis and observations of the network. These actions may involve troubleshooting, optimization suggestions, or other network-related recommendations.

Option A is incorrect because while Marvis provides insights, the focus is not just on highlighting actionable items but on detailing actions the AI can take to improve the network.
Option C is not correct because Marvis Actions are more about the AI's analysis and response, not the user's own actions.
Option D is also wrong as the focus of Marvis is on automated AI-driven actions, not the individual wireless users' behaviors.

Thus, the correct answer is B, as Marvis Actions provide a dashboard to track the AI-driven actions and suggestions to improve the network’s performance and address issues automatically.

Question No 2:

Which protocol does Mist cloud use to send and receive data to connected access points?

Options:

A. PPTP
B. SSH
C. MQTT
D. HTTPS

Answer: C. MQTT

Explanation:

The Mist Cloud, part of Juniper Networks, utilizes the MQTT (Message Queuing Telemetry Transport) protocol for communication between its cloud platform and the connected access points (APs). MQTT is a lightweight, publish-subscribe-based messaging protocol designed for low-bandwidth, high-latency networks. It is commonly used for IoT (Internet of Things) applications because it allows for efficient, scalable communication in environments where resources are constrained.

Option A: PPTP (Point-to-Point Tunneling Protocol) is a VPN protocol and is unrelated to the communication methods between cloud systems and access points.
Option B: SSH (Secure Shell) is a protocol used for securely accessing network devices but is not used for continuous communication in cloud-to-device data transfers.
Option D: HTTPS is used for secure web traffic but isn't the primary protocol for cloud communication with wireless devices in the context of Mist.

The correct answer is C (MQTT) because this protocol is optimized for lightweight communication, making it ideal for managing data flow between the Mist cloud platform and wireless access points. It enables efficient, real-time data transfer and management of network operations.

Question No 3:

At which two configuration levels are WLAN objects created? (Choose two.)

Options:

A. user level
B. site level
C. org level
D. device level

Answer: B. site level, C. org level

Explanation:

In network management systems like Mist, WLAN objects (Wi-Fi network settings, SSIDs, security policies, etc.) are typically created at higher organizational levels, such as the "organization level" and the "site level."

Option A (user level) is not correct because WLAN objects are generally not configured at the individual user level; this level typically deals with individual user profiles and device settings.
Option B (site level) is correct because WLAN objects are often configured at the site level. A site in the Mist network architecture refers to a physical location where network infrastructure is deployed. Configuring WLAN objects at this level allows settings like SSIDs, security settings, and traffic management policies to be applied to the access points deployed within that site.
Option C (org level) is also correct because the organization level allows for higher-level configuration settings that apply across multiple sites. For example, global WLAN objects can be set at the organization level to ensure consistency across all locations.
Option D (device level) is incorrect because WLAN objects are typically not configured directly on individual devices, such as access points. Device-level configurations typically deal with settings specific to the hardware or the device's role in the network.

Therefore, the correct answers are B (site level) and C (org level), as these levels are where WLAN objects are created to define network policies and settings for large-scale deployment.

Question No 4;

As an organization administrator, what are two ways to configure additional layers of security for administrator logins? (Choose two.)

Options:

A. Enable a password policy.
B. Enable two-factor authentication.
C. Disable a password policy.
D. Increase session timeouts.

Answer: A. Enable a password policy.
B. Enable two-factor authentication.

Explanation:

To enhance security for administrator logins in an organization, administrators can implement additional security layers. The correct methods in this case are enabling a password policy and enabling two-factor authentication (2FA). Let’s explore each option in detail:

Enable a password policy: A password policy is a set of rules that dictate the strength and complexity of passwords used to access accounts within an organization. Enforcing a password policy is one of the most basic and effective ways to increase the security of administrator logins. Stronger password requirements such as minimum length, mandatory use of special characters, numbers, and uppercase letters, as well as periodic password changes, make it more difficult for attackers to gain unauthorized access. This helps protect administrator accounts from brute-force attacks, where attackers try to guess or crack passwords.
Enable two-factor authentication (2FA): Two-factor authentication adds an extra layer of security by requiring not only the password but also an additional form of identification to verify the user’s identity. This could involve a code sent via text message, an authentication app, or a hardware token. Even if an attacker manages to steal or guess a password, they cannot access the system without the second factor. Implementing 2FA significantly reduces the risk of unauthorized login attempts, particularly if the password is compromised.

The other options are less effective or even counterproductive:

Disable a password policy: Disabling a password policy would actually weaken security, as it allows administrators to use weak passwords. Without a password policy, administrators might create easily guessable passwords, making it easier for attackers to breach the system.
Increase session timeouts: Increasing session timeouts can allow administrators to remain logged in for longer periods of time, which could be a convenience in some cases. However, this is not a security feature. In fact, extended session times could potentially increase the risk of unauthorized access if an administrator forgets to log out or if a malicious actor gains access to the session.

In summary, enabling a password policy and two-factor authentication are essential security measures for protecting administrator logins.

Question No 5:

By default, how long does an Installer role have access to a site for initial configuration before expiration?

Options:

A. unlimited
B. 48 hours
C. 7 days
D. 24 hours

Answer: B. 48 hours

Explanation:

The Installer role is a special role granted to users who are responsible for setting up and configuring a site for the first time. By default, the Installer role has temporary access to the site for configuration tasks. This role is designed to ensure that only authorized users can configure a new site initially and that this access is limited to a reasonable timeframe to prevent potential security risks.

48 hours: By default, the Installer role has access for 48 hours after the role is granted. This time period allows the installer sufficient time to complete initial configuration tasks, such as setting up the site, installing required components, and performing necessary security configurations. Once the 48-hour window expires, the Installer role will automatically expire, ensuring that the role does not remain active longer than necessary, thereby reducing the security risks associated with long-term access.
Unlimited: Granting unlimited access to an Installer role would be highly insecure. This would give the installer permanent access to configure or modify the site indefinitely, which could open up the site to potential abuse or unauthorized changes. Therefore, "unlimited" is not the correct answer in this case.
7 days: While 7 days might sound like a reasonable time frame, it is not the default for the Installer role. Allowing 7 days for initial configuration is overly generous for typical site setups, as most installations should be completed within a couple of days. The default duration for Installer access is 48 hours, not 7 days.
24 hours: A 24-hour window could also be considered too short for the typical configuration tasks. While some installation processes might be quick, 48 hours provides enough buffer for unexpected issues or additional configuration time that might arise during site setup.

Question No 6:

Which operation does an HTTP POST perform?

Options:

A. Write
B. Delete
C. Create
D. Read

Answer: C. Create

Explanation:

The HTTP POST method is primarily used to create a new resource on a server. It is one of the most commonly used HTTP methods, particularly in RESTful APIs (Representational State Transfer). To understand why POST is used to create resources, it's essential to comprehend the basic operations that can be performed by HTTP methods, known as CRUD operations. CRUD stands for:

Create: Adding new data to the server.
Read: Fetching data from the server.
Update: Modifying existing data on the server.
Delete: Removing data from the server.

HTTP methods correspond to these operations as follows:

GET: Read (fetch data from the server).
POST: Create (add new data to the server).
PUT/PATCH: Update (modify existing data).
DELETE: Delete (remove data).

The HTTP POST request is used to submit data to be processed by the server. In most cases, this data is used to create a new resource on the server. For example, in a web application like a blog, when a user submits a form to create a new post, a POST request is sent to the server with the content of the post. The server processes the request and creates the new post resource in the backend database.

It’s important to note that while POST is typically associated with creating resources, it can also be used for other purposes, like submitting forms or invoking actions. However, in the context of the question and typical API interactions, POST is most often associated with creating resources.

Question No 7:

The exhibit displays the connection flow for an API interaction sequence. Which API type is displayed?

Options:

A. SOAP
B. WebSocket
C. Webhook
D. RESTful

Answer: D. RESTful

Explanation:

The term "API" (Application Programming Interface) refers to a set of protocols and tools that allow different software applications to communicate with each other. The question refers to an API interaction sequence, and it’s asking for the type of API based on the exhibited connection flow.

To understand the correct answer, let’s first break down the options:

SOAP (Simple Object Access Protocol):
SOAP is a protocol for exchanging structured information in the implementation of web services. SOAP messages are usually formatted in XML and can operate over various protocols, such as HTTP, SMTP, or even more advanced transport protocols like JMS. SOAP services are often more rigid and require a specific structure for requests and responses. If the exhibit showed a formal, XML-based structure for requests, this could be indicative of SOAP.
WebSocket:
WebSocket is a communication protocol that provides full-duplex communication channels over a single TCP connection. It allows for real-time, bi-directional communication between a client and a server. WebSocket is different from traditional HTTP-based communication because it allows ongoing, persistent communication without the need for repeated connections. WebSockets are not typically used for RESTful services, and the connection flow in the exhibit would likely be more continuous and bidirectional if it were a WebSocket.
Webhook:
A webhook is a user-defined HTTP callback. It’s an HTTP POST request that a server sends to a client (or another server) when an event occurs. Webhooks are event-driven and allow one system to notify another system of updates. A Webhook is not a type of API but a pattern for handling asynchronous notifications. In the case of webhooks, a server triggers an HTTP request to another server upon an event, such as a payment being processed or a new user being created. If the connection flow involves an event-driven action where one system pushes data to another based on a specific event, this could indicate a webhook.
RESTful API:
REST (Representational State Transfer) is an architectural style for building web services that interact over HTTP. A RESTful API follows a set of principles that define how web services should behave. The interactions typically involve HTTP methods such as GET, POST, PUT, DELETE, etc., with the server providing different resources (data) and the client accessing or manipulating these resources based on the request type. RESTful APIs are stateless and use standard HTTP verbs for operations. If the exhibit showed a flow where the client sends an HTTP request, and the server responds with the data or status, then it is highly likely a RESTful interaction.

Question No 8:

How does Mist determine the location of clients in an indoor setting?

Options:

A. probability surface
B. triangulation
C. trilateration
D. GPS

Answer: C. trilateration

Explanation:

Mist, a wireless network solution, determines the location of clients within an indoor environment using a technique called trilateration. This method involves measuring the distances from multiple reference points to a target (in this case, the client device) in order to estimate its position. Let’s dive deeper into this technique and why it’s the correct answer, and also explore the other options.

Trilateration:
Trilateration is the primary method that Mist uses for indoor location tracking. It requires at least three reference points (typically access points or beacons placed around the indoor space). These access points have a known position, and Mist measures the signal strength or time-of-flight between the access points and the client device. By calculating the distances between the client and each reference point, Mist can triangulate the client’s location within the indoor environment. Trilateration is highly accurate when the placement of access points is optimized and the network is well-configured.
Probability Surface:
A probability surface is not a method used by Mist for location determination but is a concept in wireless networking related to signal strength and coverage. In some systems, probability surfaces may be used to model signal coverage over a region, but Mist’s indoor locationing is based on trilateration, not a probability surface. The probability surface would provide a statistical estimate of location, but it wouldn't be precise enough for the accurate indoor positioning required by Mist's system.
Triangulation:
Triangulation is a technique that relies on angles rather than distances to determine location. By measuring the angles between the client device and multiple fixed reference points, triangulation can estimate the location. However, triangulation is not the method used by Mist for indoor client locationing. Instead, trilateration—which uses distance measurements—provides more accurate results in environments where precise distance calculation is possible via signal strength or time-of-flight data.
GPS:
GPS (Global Positioning System) is widely used for outdoor positioning but does not work well in indoor settings because GPS signals struggle to penetrate buildings. GPS relies on satellites, and indoor environments often block or distort these signals. As a result, Mist cannot use GPS for indoor client locationing. Instead, it uses trilateration based on Wi-Fi signals from the installed access points.

In conclusion, trilateration is the method used by Mist to determine the location of clients in indoor environments. This technique is highly accurate when access points are properly distributed, ensuring the precise location of clients in real-time.

Question No 9:

You are troubleshooting a wireless authentication problem.

Which two Mist features would help you in this scenario? (Choose two.)

Options:

A. client events
B. audit logs
C. packet capture
D. access point events

Answer:
A. client events
B. audit logs

Explanation:
When troubleshooting a wireless authentication problem, Mist offers several tools that help diagnose and resolve issues. The correct tools in this case are client events and audit logs. Let’s break down each of these features and why they are the most useful for this situation, while also exploring the other options.

Client Events:
Client events are crucial when diagnosing wireless authentication issues. These events provide detailed information about the behavior of client devices as they attempt to connect to the network. In the context of authentication problems, client events can help you track whether the client device is sending authentication requests, receiving responses from the access points, and if there are any errors or failures in the process. Mist’s platform records these events and presents them in a way that makes it easier to identify issues such as misconfigured credentials, unsupported security protocols, or connectivity problems. Client events also help you understand whether the authentication process is failing at the client, the access point, or the network infrastructure.
Audit Logs:
Audit logs provide a detailed, time-stamped record of activities and system events. These logs capture all actions performed by users, administrators, and the system itself, including authentication attempts and any errors that may have occurred during these attempts. In the case of authentication issues, the audit logs can help you trace back the authentication flow, identify failed login attempts, and determine whether the issue is related to misconfigured policies, expired credentials, or other security concerns. Audit logs can also give insight into changes made to the network that may have affected authentication settings, such as configuration updates or changes to security protocols.

The other two options, packet capture and access point events, can also be useful in certain troubleshooting scenarios but are less directly related to identifying authentication issues:

Packet Capture:
Packet capture is a powerful tool that allows network administrators to capture and analyze data packets as they travel through the network. While packet capture can help diagnose network issues and inspect the actual data being transmitted (such as authentication packets), it requires deeper knowledge of networking protocols and can be more time-consuming to analyze. In most cases, troubleshooting authentication issues does not require the depth of detail that packet capture provides, especially when more direct tools, such as client events and audit logs, can offer sufficient information. Therefore, while packet capture can be a valuable tool, it is not as straightforward for identifying authentication problems as the other options.
Access Point Events:
Access point events track events occurring at the access points, such as client connections, disconnections, or failures to associate. While these events are helpful for troubleshooting connectivity issues, they are not as directly tied to the specific issue of authentication failures as client events and audit logs. Access point events can indicate whether the access point is successfully receiving authentication requests or if it is rejecting clients for other reasons (e.g., signal strength or network issues), but they do not provide as detailed information about the underlying causes of authentication failures as client events and audit logs.

for troubleshooting a wireless authentication problem, client events and audit logs are the most effective tools. They provide targeted insights into the authentication process, helping administrators quickly identify and resolve issues related to client authentication.