高質量的JN0-481題庫資料|高通過率的考試材料|確保通過的JN0-481：Data Center, Specialist (JNCIS-DC)

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最新的 JNCIS-DC JN0-481 免費考試真題 (Q43-Q48):

問題 #43
In Juniper Apstra terminology, to which network operating system concept does a routing zone refer?

答案：D

解題說明：
In Juniper Apstra terminology, a routing zone corresponds to a VRF (Virtual Routing and Forwarding) instance in a network operating system. It represents a separate routing table that provides traffic isolation between tenants or applications.


問題 #44
You are using Juniper Apstra to create logical devices and interface maps. You use them in three different rack types. You then modify the logical devices to support the required increased interface speeds and receive an error message when updating the logical devices.

Referring to the exhibit, which action is needed to remove the error?

答案：A

解題說明：
In Apstra 5.1, a logical device defines the abstract port layout and capabilities (including supported speeds), while an interface map binds that abstract port layout to the real, vendor-specific front-panel ports. Rack types then consume logical devices and interface maps to model the rack's leaf/superspine roles. Once a logical device is referenced by interface maps and used inside rack types (and potentially templates that instantiate those rack types), Apstra treats the combination as a consistent contract: port counts, roles, and speeds must remain semantically valid for every object that depends on it.
The exhibit's validation error indicates that after changing interface speeds on the logical device, the existing interface map(s) and their usage in rack types no longer match the logical device definition (for example, the map expects certain ports/speeds/roles, but the updated logical device would leave the map invalid). Because the logical device is being consumed in multiple places, the safest and required way to remove the error is to remove all dependencies-templates (if they reference the rack types), rack types, and interface maps-so Apstra can accept the new logical device definition without violating existing mappings. After updating the logical device, you then recreate or update the interface maps and re-associate them with the rack types/templates so the entire chain remains consistent under the new speed requirements.


問題 #45
A member of your organization made changes to a predefined interface map using Juniper Apstra.
Which two statements are correct in this scenario? (Choose two.)

答案：C,D

解題說明：
According to the Juniper documentation1, an interface map is a configuration template that maps interfaces between logical devices and physical hardware devices (represented with device profiles) while adhering to vendor specifications. An interface map can be either predefined or custom. A predefined interface map is one that ships with Apstra software and supports most qualified Juniper devices. A custom interface map is one that is created by the user to meet specific requirements. An interface map can be stored in either the global catalog or the blueprint catalog. The global catalog contains all the interface maps that are available for use in any blueprint. The blueprint catalog contains the interface maps that are imported from the global catalog and used in a specific blueprint.
When a member of your organization makes changes to a predefined interface map, the following statements are correct:
Changes to interface maps in the global catalog do not affect interface maps that have already been imported into blueprint catalogs. This means that the existing blueprints that use the original version of the interface map will not be impacted by the changes. However, if you want to use the updated version of the interface map in a new or existing blueprint, you need to import it again from the global catalog.
Any changes made to predefined interface maps are discarded when Apstra is upgraded. This means that the changes will not be preserved across different versions of Apstra software. If you want to retain a customized interface map through Apstra upgrades, you need to clone the predefined interface map, give it a unique name, and customize it instead of changing the predefined one directly.
Therefore, the correct answer is A and B. Changes to interface maps in the global catalog do not affect interface maps that have already been imported into blueprint catalogs and any changes made to predefined interface maps are discarded when Apstra is upgraded. Reference: Edit Interface Map | Apstra 4.2 | Juniper Networks


問題 #46
When an agent installation is successful, devices are placed into which state using the Juniper Apstra Ul?

答案：B

解題說明：
When an agent installation is successful, devices are placed into the Out of Service Quarantined (OOS-QUARANTINED) state using the Juniper Apstra UI. This state means that the device is not yet managed by Apstra and has not been assigned to any blueprint. The device configuration at this point is called Pristine Config. To make the device ready for use in a blueprint, you need to acknowledge the device, which changes its state to Out of Service Ready (OOS-READY).


問題 #47
Exhibit.

Referring to the exhibit, which role does Device A serve in an IP fabric?

答案：C

解題說明：
Device A serves as a spine in an IP fabric. An IP fabric is a network architecture that uses a spine-leaf topology to provide high performance, scalability, and reliability for data center networks. A spine-leaf topology consists of two layers of devices: spine devices and leaf devices. Spine devices are the core devices that interconnect all the leaf devices using equal-cost multipath (ECMP) routing. Leaf devices are the edge devices that connect to the servers, storage, or other network devices. In the exhibit, Device A is connected to four leaf devices using multiple links, which indicates that it is a spine device. The other options are incorrect because:
A . leaf is wrong because a leaf device is an edge device that connects to the servers, storage, or other network devices. In the exhibit, Device A is not connected to any servers, storage, or other network devices, but only to four leaf devices, which indicates that it is not a leaf device.
C . super spine is wrong because a super spine device is a higher-level device that interconnects multiple spine devices in a large-scale IP fabric. A super spine device is typically used when the number of leaf devices exceeds the port density of a single spine device. In the exhibit, Device A is not connected to any other spine devices, but only to four leaf devices, which indicates that it is not a super spine device.
D . server is wrong because a server device is a compute or storage device that connects to a leaf device in an IP fabric. A server device is typically the end host that provides or consumes data in the network. In the exhibit, Device A is not connected to any leaf devices, but only to four leaf devices, which indicates that it is not a server device. Reference:
IP Fabric Underlay Network Design and Implementation
IP Fabric Overview
IP Fabric Architecture


問題 #48
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