[2026年03月] 合格させるJuniper JN0-481テストエンジンPDFで完全版無料問題集
Data Center, Specialist (JNCIS-DC)練習テスト2026年最新のJN0-481ストレスなしで合格！
質問 # 23
In the Juniper Apstra Ul. You are creating a VNI pool for virtual networks.
In this scenario, which VNI range is acceptable?
- A. The valid VNI range is 2 through 4096.
- B. The valid VNI range is 4096 through 16777214.
- C. The valid VNI range is 1 through 10000.
- D. Any range is acceptable for the VNI pool.
正解：B
解説：
In the Juniper Apstra UI, you can create VNI pools for virtual networks that use VXLAN encapsulation in the overlay network. A VNI pool is a resource pool that contains a range of VNIs that can be assigned to the virtual networks. The valid VNI range for a VNI pool is 4096 through
16777214, according to the VXLAN standard. Therefore, the statement B is correct in this scenario. The following three statements are incorrect in this scenario:
Any range is acceptable for the VNI pool. This is not true, because the VNI range has a lower and upper limit defined by the VXLAN standard. The lower limit is 4096, and the upper limit is
16777214. Any VNI outside this range is invalid and cannot be used for VXLAN encapsulation.
The valid VNI range is 2 through 4096. This is not true, because the VNI range does not start from 2, but from 4096. The VNIs from 2 to 4095 are reserved and cannot be used for VXLAN encapsulation. The valid VNI range is 1 through 10000. This is not true, because the VNI range does not include 1, which is also reserved and cannot be used for VXLAN encapsulation. The VNI range also does not end at 10000, but at 16777214, which is the maximum possible value for a 24-bit VNI field.
質問 # 24
Which two statements are correct regarding a pristine configuration in Juniper Apstra? (Choose two.)
- A. It is the device's previously active configuration.
- B. It is the device's currently active configuration.
- C. It Is the configuration file on a device before acknowledgment in Apstra.
- D. It is the configuration file placed on the device when decommissioning the device.
正解：C、D
解説：
A pristine configuration in Juniper Apstra is the configuration file that is used to onboard a device into the Apstra software application. A pristine configuration contains the minimum settings that are required for the device to communicate with the Apstra server, such as the hostname, management IP address, username, password, and SSH key. A pristine configuration has the following characteristics:
It is the configuration file placed on the device when decommissioning the device. This is because when a device is decommissioned from the Apstra software application, it is reverted back to its pristine configuration, which removes all the network configuration and services that were applied by the Apstra software application. This allows the device to be reused or repurposed for another network.
It is the configuration file on a device before acknowledgment in Apstra. This is because when a device is onboarded into the Apstra software application, it is initially in the discovery state, which means that the device is discovered by the Apstra server, but not yet acknowledged by the user.
In the discovery state, the device has the pristine configuration, which can be viewed and edited by the user. Once the user acknowledges the device, the device moves to the deployed state, which means that the device is ready to receive the network configuration and services from the Apstra software application.
質問 # 25
You are installing a Juniper Apstra server in your data center. You have multiple users that will be expected to configure, manage, and carry out operational tasks in your data center. You have decided to implement remote user authentication for the role-based access control of your Apstra server. In this scenario, which three methods are supported? (Choose three.)
- A. SAML
- B. RADIUS
- C. TACACS+
- D. Auth0
- E. LDAP
正解：B、C、E
解説：
To implement remote user authentication for the role-based access control of your Apstra server, you can use one of the following methods: TACACS+, LDAP, or RADIUS. These are the protocols that Juniper Apstra supports to authenticate and authorize users based on roles assigned to individual users within an enterprise. You can configure the Apstra server to use one or more of these protocols as the authentication sources and specify the order of preference. You can also configure the Apstra server to use local user accounts as a fallback option if the remote authentication fails.
質問 # 26
Referring to the exhibit, how do you display the IPv6 subnets lot all of the listed VXLANs?
- A. IPv6 subnets ate shown when each VXLAN is selected individually.
- B. Select all VXLANs, and the IPv6 Subnets column will appear
- C. An IPv6 Subnets column is not shown, indicating that no VXLAN has an assigned IPv6 subnet
- D. Select Columns, then select IPv6 Subnet.
正解：D
解説：
Referring to the exhibit, the image shows a user interface of the Juniper Apstra software application, which is used for network management and configuration. The image shows the Virtual Networks table under the Resources menu, which displays the details of the VLANs and VXLANs in the network. The table has 11 columns, but only 9 are visible in the image. The other two columns are IPv6 Connectivity and IPv6 Subnet, which are hidden by default. To display the IPv6 subnets for all of the listed VXLANs, the user needs to select Columns, then select IPv6 Subnet. This will show the IPv6 Subnet column in the table, which will display the IPv6 addresses assigned to the VXLANs from the IPv6 pools. For more information, see Virtual Networks (Resources).
質問 # 27
In the Juniper Apstra design phase, which object dictates port count, port speed, and how the ports would be used?
- A. rack type
- B. interface map
- C. network devices
- D. logical devices
正解：B
解説：
Interface maps are objects that map interfaces between logical devices and physical hardware devices in the Juniper Apstra design phase. They dictate port count, port speed, and how the ports would be used for achieving the intended network configuration rendering. Interface maps also allow you to select device ports, transformations, and interfaces, provision breakout ports, and disable unused ports.
質問 # 28
Multilenancy for applications is achieved by creating virtual networks (VNs) within which construct?
- A. connectivity template
- B. routing table
- C. security policy
- D. routing zone
正解：D
解説：
A routing zone is an L3 domain, the unit of tenancy in multi-tenant networks. You create routing zones for tenants to isolate their IP traffic from one another, thus enabling tenants to re-use IP subnets. In addition to being in its own VRF, each routing zone can be assigned its own DHCP relay server and external system connections. You can create one or more virtual networks within a routing zone, which means a tenant can stretch its L2 applications across multiple racks within its routing zone.
質問 # 29
Which statement is correct about the Juniper Apstra Rendered configuration?
- A. It is dynamically tendered at commit time.
- B. It is built at commit time and stored in a MySQL database.
- C. It is stored in a NoSQL database and incrementally updated.
- D. It is rendered from the graph database and stored locally.
正解：A
解説：
The Juniper Apstra Rendered configuration is the configuration that is generated from the staged blueprint and applied to the devices in the network. The Rendered configuration is dynamically rendered at commit time, which means that it is created on the fly based on the latest changes and validations in the blueprint. The Rendered configuration is not stored in any database, but it can be viewed in the Apstra UI or downloaded as a file. The Rendered configuration reflects the desired state of the network as defined by the intent of the blueprint.
質問 # 30
Which two protocols can be used to advertise EVPN routes? (Choose two.)
- A. MP-IBGP
- B. OSPF
- C. MP-EBGP
- D. IS-IS
正解：A、C
質問 # 31
The 10.100.0.0/16 route is being advertised into your BGP IP fabric. ECMP load balancing has been properly enabled on all devices.
In this scenario, how many routes will the leaf device in AS 65000 receive for the 10.100.0.0/16 prefix?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
The leaf device in AS 65000 will receive three routes for the 10.100.0.0/16 prefix, one from each spine device in AS 65001, AS 65002, and AS 65003. Since ECMP load balancing is enabled, the leaf device will install all three routes in its routing table and distribute the traffic among them.
質問 # 32
Which two statements about VXLAN VNIs are correct? (Choose two.)
- A. VNIs can have over 16 million unique values.
- B. VNIs identify a broadcast domain
- C. VNIs identify a collision domain.
- D. VNIs are alphanumeric values.
正解：A、B
解説：
VXLAN VNIs are virtual network identifiers that are used to identify and isolate Layer 2 segments in the overlay network. VXLAN VNIs have the following characteristics:
VNIs can have over 16 million unique values. This is because VXLAN VNIs are 24-bit fields that can range from 4096 to 16777214, according to the VXLAN standard. This allows VXLAN to support a large number of Layer 2 segments and tenants in the network. VNIs identify a broadcast domain. This is because VXLAN VNIs are used to group the end hosts that belong to the same Layer 2 segment and can communicate with each other using VXLAN tunnels. The VXLAN tunnels are established using the VTEP information that is distributed by EVPN. The VTEPs are VXLAN tunnel endpoints that perform the VXLAN encapsulation and decapsulation.
The VXLAN tunnels preserve the Layer 2 semantics and support the broadcast, unknown unicast, and multicast traffic within the same VNI.
質問 # 33
You want to keep virtual networks isolated from each other within the Juniper Apstra system. In this scenario, what are three ways to accomplish this task? (Choose three.)
- A. Enable Security Policy for virtual networks in the same Routing Zone.
- B. Disable Route Target exports when creating the Routing Zones.
- C. Disable IPv4 connectivity when creating the virtual network within the same Routing Zone.
- D. Put each network in different Routing Zones.
- E. Use Connectivity Templates to block access within the same Routing Zone.
正解：A、D、E
解説：
To keep virtual networks isolated from each other within the Juniper Apstra system, you can use one or more of the following methods:
Enable Security Policy for virtual networks in the same Routing Zone. This allows you to define rules that control the traffic flow between different virtual networks within the same routing zone.
You can specify the source and destination virtual networks, the protocol, the port, and the action (allow or deny) for each rule. The security policy is applied on the ingress interface of the leaf devices.
Use Connectivity Templates to block access within the same Routing Zone. This allows you to customize the connectivity between different racks within the same routing zone. You can create templates that define the link type, the routing protocol, and the access control list (ACL) for each rack pair. The ACL can be used to filter the traffic based on the source and destination IP addresses, the protocol, and the port.
Put each network in different Routing Zones. This allows you to create logical boundaries between different virtual networks based on the route target (RT) values. A routing zone is a collection of virtual networks that share the same RT for importing and exporting routes. Virtual networks in different routing zones do not exchange routes with each other, unless you configure remote EVPN gateways to connect them.
質問 # 34
What is the purpose of a Juniper Apstra rack?
- A. It stores information on how pods connect to super spines.
- B. It stores device port data rates and vendor information.
- C. It stores information on how leaf nodes connect to generic devices
- D. It stores IP address and ASN pool information.
正解：C
解説：
A Juniper Apstra rack is a physical entity that contains one or more network devices, such as leaf nodes, access switches, or generic systems. A rack is used to organize and manage the network devices in the Apstra software application. A rack has the following characteristics:
It stores information on how leaf nodes connect to generic devices. This is because a rack can include generic systems, which are devices that are not managed by Juniper Apstra, but are connected to the network. A generic system can be a server, a firewall, a load balancer, or any other device that has a network interface. A rack stores the information on how the leaf nodes, which are the devices that provide access to the end hosts, connect to the generic devices, such as the port number, the link speed, the LAG mode, and the roles.
It has a rack type, which defines the type and number of leaf devices, access switches, and/or generic systems that are used in the rack. A rack type is a resource that is created in the data center design phase, and it does not specify the vendor or the model of the devices. A rack type can be predefined or custom-made, and it can be used to create multiple racks with the same structure and configuration.
It has a rack build, which assigns the specific vendor and model of the devices to the rack. A rack build is created in the staged phase, and it uses the rack type as a template. A rack build can also assign the resources, such as the IP addresses, the ASNs, and the VNIs, to the devices in the rack. It has a rack deployment, which applies the network configuration and services to the devices in the rack. A rack deployment is performed in the active phase, and it uses the rack build as a reference. A rack deployment can also monitor the network performance and compliance of the devices in the rack.
質問 # 35
In Juniper Apstra, which statement is correct?
- A. VMware anomaly detection requires an Apstra server running on VMware.
- B. VMware anomaly detection requires a VMware hypervisor with exports enabled.
- C. VMware anomaly detection requires a vCenter server configured under External Systems
- D. VMware anomaly detection is on by default.
正解：C
解説：
VMware anomaly detection is a feature of Apstra that provides visibility and validation of the virtual network settings and the physical network settings in a VMware vSphere environment. To enable this feature, Apstra requires a connection to a vCenter server that manages the ESX/ESXi hosts and the VMs connected to the Apstra-managed leaf switches. The vCenter server must be configured under External Systems in the Apstra web interface, and the vCenter integration must be staged and committed in the blueprint. This allows Apstra to collect information about VMs, ESX/ESXi hosts, port groups, and VDS, and to flag any inconsistencies or mismatches that might affect VM connectivity.
質問 # 36
You want to make a widget appear on the main dashboard in Juniper Apstr
- A. Widgets automatically appear on the blueprint dashboard.
- B. Set the Default toggle switch to On for the desired widget.
- C. In this scenario, which statement is correct?
- D. On the blueprint dashboard, click on the Add Widget option.
- E. When creating the widget, select the Add to Blueprint Dashboard option.
正解：A
解説：
In Juniper Apstra, a widget is a graphical element that displays data from an intent-based analytics (IBA) probe. A widget can be used to monitor different aspects of the network and raise alerts to any anomalies. A widget can be viewed by itself or added to an analytics dashboard. A dashboard is a collection of widgets that can be customized and organized according to the user's preference. The main dashboard in Juniper Apstra is the blueprint dashboard, which is the default view that shows the network information and configuration for the active blueprint. A blueprint is a logical representation of the network design and intent. The blueprint dashboard can display the system-generated dashboards, the user-generated dashboards, and the individual widgets that are relevant to the network.
To make a widget appear on the main dashboard in Juniper Apstra, the user needs to set the Default toggle switch to On for the desired widget. This will add the widget to the blueprint dashboard, where it can be viewed along with other network information. The user can also remove the widget from the blueprint dashboard by setting the Default toggle switch to Off for the widget.
質問 # 37
Which two actions are required during Juniper Apstra's deploy phase? (Choose two.)
- A. Assign resources to the blueprint.
- B. Assign device profiles to the blueprint.
- C. Assign interlace maps to the blueprint.
- D. Assign user roles to the blueprint.
正解：A、B
解説：
The deploy phase is the final step in the Juniper Apstra data center fabric design and deployment process. In this phase, you apply the Apstra-rendered configuration to the devices and verify the intent of the blueprint. Based on the web search results, we can infer the following actions are required during the deploy phase:
Assign device profiles to the blueprint. This action associates a specific vendor model to each logical device in the blueprint. Device profiles contain extensive hardware model details, such as form factor, ASIC, CPU, RAM, ECMP limit, and supported features. Device profiles also define how configuration is generated, how telemetry commands are rendered, and how configuration is deployed on a device. Device profiles enable the Apstra system to render and deploy the configuration according to the Apstra Reference Design. Assign resources to the blueprint. This action allocates the physical devices, IP addresses, VLANs, and ASNs to the logical devices, networks, and routing zones in the blueprint. Resources can be assigned manually or automatically by the Apstra system. Assigning resources ensures that the blueprint has all the necessary elements to generate the configuration and deploy the fabric5 . Assign user roles to the blueprint. This action is not required during the deploy phase. User roles are defined at the system level, not at the blueprint level. User roles determine the permissions and access levels of different users in the Apstra system. User roles can be system-defined or custom-defined .
Assign interface maps to the blueprint. This action is not required during the deploy phase.
Interface maps are defined at the design phase, not at the deploy phase. Interface maps are objects that map the logical interfaces of a logical device to the physical interfaces of a device profile. Interface maps enable the Apstra system to generate the correct interface configuration for each device in the fabric.
質問 # 38
Multilenancy for applications is achieved by creating virtual networks (VNs) within which construct?
- A. connectivity template
- B. routing table
- C. security policy
- D. routing zone
正解：D
解説：
A routing zone is an L3 domain, the unit of tenancy in multi-tenant networks. You create routing zones for tenants to isolate their IP traffic from one another, thus enabling tenants to re-use IP subnets. In addition to being in its own VRF, each routing zone can be assigned its own DHCP relay server and external system connections. You can create one or more virtual networks within a routing zone, which means a tenant can stretch its L2 applications across multiple racks within its routing zone.
質問 # 39
Referring to the exhibit, which statement is correct?
- A. The gray-solid primitives indicate further configuration is requited.
- B. The gray-solid primitives indicate that they ate incompatible with the connectivity template design.
- C. The red-striped primitives indicate that further configuration is required.
- D. The red-striped primitives indicate that they are incompatible with the connectivity template design.
正解：C
解説：
A connectivity template is a set of configuration parameters that can be applied to a device or a group of devices in a blueprint. A blueprint is a logical representation of the network design and intent. A primitive is a basic unit of configuration that can be added to a connectivity template. A primitive can be a link, a peering, a policy, or a service. In the exhibit, the red-striped primitives indicate that further configuration is required for them to be compatible with the connectivity template design. The red stripes mean that the primitive is incomplete or invalid, and it needs to be edited or deleted. For example, the IP Link primitive needs to have the interface name and IP address specified for each end of the link.
質問 # 40
When working with logical devices, you specify where each port group is connected. In this scenario, which two Juniper Apstra Ul options are available to the operator? {Choose two.)
- A. generic
- B. firewall
- C. router
- D. unused
正解：A、D
解説：
When working with logical devices, you specify where each port group is connected by selecting the port group layout and the port speed and role (s) for each port group. The Juniper Apstra UI offers two options to the operator for the port group role: unused and generic.
Unused: This option means that the port group is not configured or used by Apstra. This can be useful for ports that are faulty, reserved, or not part of the data center fabric.
Generic: This option means that the port group is configured with a generic role that is not specific to any device type or function. This can be useful for ports that are used for testing, troubleshooting, or custom purposes.
質問 # 41
In the case of IP Clos data center five-stage fabric design, what are two rotes of the super spines? (Choose two.)
- A. Super spines are used to connect leaf nodes within a data center pod.
- B. Super spines are always connected to an external data center gateway.
- C. Super spines are used to interconnect two different data center pods.
- D. Super spines connect to all spine devices within the five-stage architecture.
正解：C、D
解説：
In the case of IP Clos data center five-stage fabric design, the super spines are the devices that provide the highest level of aggregation in the network. They have two main roles:
Super spines are used to interconnect two different data center pods. A pod is a cluster of leaf and spine devices that form a 3-stage Clos topology. A 5-stage Clos topology consists of multiple pods that are connected by the super spines. This allows for scaling the network to support more devices and bandwidth.
Super spines connect to all spine devices within the five-stage architecture. The spine devices are the devices that provide the second level of aggregation in the network. They connect to the leaf devices, which are the devices that provide access to the end hosts. The super spines connect to all the spine devices in the network, regardless of which pod they belong to. This provides any-to-any connectivity between the pods and enables optimal routing and load balancing.
質問 # 42
You are using Juniper Apstra to design a data center fabric. In this scenario, which object type associates a specific vendor model to a logical device?
- A. device profiles
- B. agent profiles
- C. interface map
- D. templates
正解：A
解説：
Device profiles are objects that associate a specific vendor model to a logical device in Juniper Apstra. Device profiles contain extensive hardware model details, such as form factor, ASIC, CPU, RAM, ECMP limit, and supported features. Device profiles also define how configuration is generated, how telemetry commands are rendered, and how configuration is deployed on a device. Device profiles enable the Apstra system to render and deploy the configuration according to the Apstra Reference Design.
質問 # 43
How does Intent-Based Analytics align with the principles of intent-based networking in terms of data exploration and analysis?
- A. By facilitating dynamic queries for intent-based data exploration
- B. By predicting future changes in the network environment
- C. By providing real-time weather updates for the data center location
- D. By managing employee property allocations in the data center
正解：A
質問 # 44
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