JN0-481 시험 - Juniper실제시험문제와 답 - 65문항

Question No : 1

A solution architect is using Apstra to model a data center based on a Juniper reference design. The reference design calls for a specific logical topology where all server-facing leaf switches are identical and all border leaf switches are identical.
How does the architect enforce this consistency and reusability in the Apstra design?

A.By creating a "Rack Type" for the server racks and another "Rack Type" for the border racks, and then using these rack types to build the template.
B.By manually tagging each switch with its role after it is added to the blueprint.
C.By creating a separate Template for each individual rack.
D.By using a single, large Configlet that defines the entire fabric topology.

정답:

Question No : 2

When configuring an EVPN-VXLAN fabric, there are two primary options for the control plane: MP-BGP EVPN and multicast.
What are the key differences and trade-offs between these two control plane options? (Select all that apply.)

A.BGP EVPN simplifies the underlay by not requiring a separate multicast routing protocol like PI
B.BGP EVPN uses a "pull" model where VTEPs discover each other, while multicast uses a "push" model for distributing BUM traffic.
C.BGP EVPN provides robust support for multi-tenancy and advanced features like MAC mobility and mass MAC withdrawal.
D.A multicast control plane is more efficient for learning unicast MAC addresses.
E.A multicast control plane requires every switch in the fabric to maintain a complete MAC address table for all hosts.

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Question No : 3

In a multi-tenant EVPN-VXLAN data center, a security administrator needs to allow a specific shared service (e.g., a DNS server in a "services" VRF) to be accessible by all tenants, while still keeping the tenants isolated from each other.
Which EVPN features and techniques should be used to achieve this controlled route leaking? (Select all that apply.)

A.Use EVPN Type 5 routes to advertise the IP prefix of the shared service.
B.On each tenant VRF, add the services route target (`target:65001:999`) to their `vrf-import` policy.
C.Configure all tenant VLANs and the services VLAN in the same bridge domain.
D.Configure the same Route Distinguisher for all tenant VRFs and the services VR
E.Use EVPN Type 2 routes to advertise the shared service.
F.On the services VRF, export its routes with a specific route target (e.g., `target:65001:999`).

정답:

Question No : 4

A network operator is provisioning a new tenant in a multi-tenant EVPN-VXLAN data center. The tenant requires two separate Layer 2 domains, VLAN 10 and VLAN 20. The operator needs to configure the VRF for this tenant.
What is the primary function of the Route Distinguisher (RD) in the VRF configuration?
routing-instances {
TENANT-C {
instance-type vrf;
interface irb.10;
interface irb.20;
route-distinguisher 10.1.1.1:300;
vrf-target target:65001:300;
}
}

A.To make all IP prefixes within the VRF globally unique across the entire BGP fabric.
B.To uniquely identify the VRF on the local switch for management purposes.
C.To control which routes are imported into and exported from the VRF table.
D.To map the VRF to a specific VXLAN Network Identifier (VNI).

정답:

Question No : 5

An EVPN-VXLAN overlay is running on top of a BGP-based IP fabric underlay. A network engineer needs to verify the control plane for the overlay.
Which of the following statements accurately describe the relationship between the underlay and overlay control planes? (Choose 2.)

A.The overlay control plane is responsible for building the routing tables that forward traffic between spines and leaves.
B.The underlay and overlay must use the same BGP sessions and AS numbers.
C.The underlay control plane's primary role is to provide reachability for the VTEP loopback addresses.
D.The overlay control plane uses BGP (typically IBGP) to distribute EVPN Network Layer Reachability Information (NLRI).
E.The underlay control plane is responsible for advertising host MAC and IP addresses.

정답:

Question No : 6

A solution architect is designing a new data center using Apstra and wants to follow Juniper's reference architecture. The architect plans to use a 3-stage Clos fabric with dedicated border leaf switches.
What is the primary role of the border leaf switches in this reference design?

A.To provide Layer 2 and Layer 3 connectivity from the data center fabric to external networks, such as the campus or the internet.
B.To host centralized services like firewalls and load balancers.
C.To connect servers and other end-hosts to the fabric.
D.To provide high-speed connectivity between the spine switches.

정답:

Question No : 7

When designing a new data center fabric in Apstra, an engineer needs to assign specific resources from a larger pool to different parts of the fabric. For example, the VTEP loopback IP addresses for racks 1-10 should come from one /24 range, while racks 11-20 should use a different /24 range.
How can the engineer achieve this granular allocation within Apstra's resource management?

A.By creating a separate Blueprint for each group of racks.
B.By creating a separate Template for each IP address range.
C.By creating child pools from a parent IP address resource pool and assigning the child pools to the different rack groups.
D.By using Tags to manually assign IP addresses to each device.

정답:

Question No : 8

"Application Unreachable" anomaly from a user-defined probe.
This correlation of events is a key feature of which Apstra concept?

A.Role-Based Access Control (RBAC)
B.Configlets
C.Root Cause Identification
D.Time Voyager

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Question No : 9

A cloud architect is designing a new data center fabric that will be managed by Juniper Apstra. The architect wants to follow Juniper's recommended best practices for building a scalable and resilient network.
Which of the following are considered Juniper Networks best practices for designing an Apstra-managed IP fabric? (Select all that apply.)

A.Use a spine-leaf (Clos) physical topology.
B.Use EBGP for the underlay, with a unique private ASN for each device.
C.Use large, monolithic chassis switches for the spine layer to simplify the topology.
D.Manually configure all device interfaces and BGP sessions via the CLI before onboarding into Apstra.
E.Use Apstra-generated configurations as the source of truth, and apply any necessary customizations via configlets.
F.Use a full mesh of IBGP sessions for the underlay for maximum redundancy.

정답:

Question No : 10

A DevOps engineer notices that a specific flow between two servers is always using the same path through the spine-leaf fabric, even though four ECMP paths are available. The engineer wants to understand why other paths are not being used for this flow.
What is the fundamental reason for this behavior?

A.The spine switches are configured to filter traffic from this specific flow.
B.BGP has selected one path as the single best path and has not installed the others in the forwarding table.
C.Spanning Tree Protocol has blocked the other three paths to prevent a loop.
D.The ECMP hashing algorithm is deterministic; for a given set of packet headers, it will always produce the same hash result.

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Question No : 11

A data center architect has to choose between two common EVPN-VXLAN overlay models for a new fabric: Centrally-Routed Bridging (CRB) and Edge-Routed Bridging (ERB).
In a CRB architecture, where is the Integrated Routing and Bridging (IRB) interface for a given tenant's VLAN located?

A.Only on the spine switches.
B.On a pair of spine switches that are designated as the central gateways for the fabric.
C.On every leaf switch that has a port in that VLA
D.On a dedicated pair of "services" leaf switches that act as the default gateway for all VLANs.

정답:

Question No : 12

A network issue occurred at 2:00 AM, and an engineer is now investigating the incident at 9:00 AM. The engineer suspects that a configuration change made around that time was the root cause.
Which Apstra feature allows the engineer to go back in time to view the exact state of the network's topology, configuration, and anomalies as they were at 2:00 AM?

A.Time Voyager
B.The Event Log
C.The Staged tab
D.The Active tab

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Question No : 13

A Network Operator needs to apply a set of user-defined labels to several leaf switches in an Apstra blueprint to signify their physical location (e.g., "DataHall-3, Row-B"). This will help with operational workflows and filtering in the UI.
What Apstra feature should the operator use to apply this metadata?

A.Tags
B.Resources
C.Annotations
D.Property Sets

정답:

Question No : 14

A NOC technician is verifying the operational state of an EVPN-VXLAN fabric. The technician needs to confirm the mapping between VLANs and their corresponding Virtual Network Identifiers (VNIs) on a leaf switch.
Which command would the technician use to display this information?

A.`show route table evpn.0`
B.`show vlans`
C.`show evpn database`
D.`show interfaces vtep`

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Question No : 15

A network architect is designing a large multi-tenant data center using EVPN-VXLAN. The architect must decide on the routing strategy for both the underlay and overlay networks. The goals are scalability, stability, and adherence to industry best practices.
Which combination of underlay and overlay routing strategies should be implemented?

A.Underlay: IBGP with spines as route reflectors, Overlay: EBGP with unique ASNs per switch.
B.Underlay: IS-IS, Overlay: OSPF
C.Underlay: OSPF, Overlay: LDP
D.Underlay: EBGP with unique ASNs per switch, Overlay: IBGP with spines as route reflectors.

정답:

Juniper JN0-481 시험