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Juniper JN0-683 Exam Syllabus Topics:

Section	Objectives
Data Center Services	- Layer 2 and Layer 3 services - Multicast in data center environments
Data Center Architecture	- Design principles for modern data center networks - Leaf-spine architecture concepts
Operations, Automation, and Troubleshooting	- Automation concepts in Junos environments - Network troubleshooting methodologies - Operational best practices
EVPN-VXLAN Overlay	- Interoperability and multitenancy design - VXLAN data plane and tunneling - EVPN control plane concepts
Data Center Underlay (IP Fabric)	- Routing protocols in data center environments - IP fabric design and routing fundamentals

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Juniper Data Center, Professional (JNCIP-DC) 認定 JN0-683 試験問題 (Q90-Q95):

質問 # 90
Click the Exhibit button.

Referring to the exhibit, data center DC1 has two pods in the same broadcast domain. You want to forward multicast traffic to only one host that is interested in receiving the multicast traffic.
In this scenario, which EVPN route type would be required to accomplish this task?

A. Type 5
B. Type 6
C. Type 7
D. Type 8

正解：C

解説：
Selective multicast forwarding (sending multicast only to receivers that joined a specific source/group) requires advertising receiver interest for an (S,G) flow in EVPN so the fabric builds a multicast forwarding state only toward the interested host, instead of flooding multicast broadly.

質問 # 91
You are using filter-based forwarding with a VXLAN overlay. In this scenario, which two statements are correct? (Choose two.)

A. Filter-based forwarding uses a routing policy to match Layer 3 source and destination addresses.
B. Filter-based forwarding applies a firewall filter on the VXLAN gateway.
C. Filter-based forwarding forwards traffic to a different VRF.
D. Filter-based forwarding uses a family inet firewall filter to match source and destination MAC addresses.

正解：B、C

解説：
Filter-based forwarding enables traffic steering into a different VRF by applying a firewall filter action that redirects matched traffic to an alternate routing instance. In a VXLAN overlay, this filter is applied on the VXLAN gateway interface to classify and redirect traffic entering or exiting the gateway.

質問 # 92
What are three actions available for MAC move limiting? (Choose three.)

A. shutdown
B. enable
C. log
D. drop
E. filter

正解：A、C、D

解説：
MAC move limiting is a security feature used in network switches to detect and mitigate rapid changes in MAC address locations, which could indicate a network issue or an attack such as MAC flapping or spoofing.
When a MAC address is learned on a different interface than it was previously learned, the switch can take various actions to prevent potential issues.
drop: This action drops packets from the MAC address if it violates the move limit, effectively blocking communication from the offending MAC address.
log: This action logs the MAC move event without disrupting traffic, allowing network administrators to monitor and investigate the event.
shutdown: This action shuts down the interface on which the MAC address violation occurred, effectively stopping all traffic on that interface to prevent further issues.

質問 # 93
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?

A. Border gateway functions occur on border leaf devices.
B. Using Virtual Chassis at the leaf layer increases resiliency.
C. It supports multiple vendors in the fabric as long as all the spine devices are Juniper devices deployed with L2 VTEPs
D. Fully meshed back-to-back links are needed between the spine devices.

正解：A

解説：
* Collapsed Fabric Architecture:
* A collapsed fabric refers to a simplified architecture where the spine and leaf roles are combined, often reducing the number of devices and links required.
* In this architecture, the spine typically handles core switching, while leaf switches handle both access and distribution roles.
* Understanding Border Gateway Functionality:
* Border gateway functions include connecting the data center to external networks or other data centers.
* In a collapsed fabric, these functions are usually handled at the leaf level, particularly on border leaf devices that manage the ingress and egress of traffic to and from the data center fabric.
* Correct Statement:
* D. Border gateway functions occur on border leaf devices:This is accurate in collapsed fabric architectures, where the border leaf devices take on the role of managing external connections and handling routes to other data centers or the internet.
Data Center References:
* The collapsed fabric model is advantageous in smaller deployments or scenarios where simplicity and cost-effectiveness are prioritized. It reduces complexity by consolidating functions into fewer devices, and the border leaf handles the critical task of interfacing with external networks.
In conclusion, border gateway functions are effectively managed at the leaf layer in collapsed fabric architectures, ensuring that the data center can communicate with external networks seamlessly.

質問 # 94
Click the Exhibit button. You are deploying a VXLAN overlay with EVPN as the control plane in an ERB architecture.
Referring to the exhibit, which three statements are correct about where then VXLAN gateways will be placed? (Choose three.)

A. All leaf devices will have L3 VXLAN gateways.
B. Spine devices will have no VXLAN gateways.
C. Only the spine devices will have L2 VXLAN gateways.
D. All leaf devices will have L2 VXLAN gateways.
E. Only the border and leaf devices will have L3 VXLAN gateways.

正解：B、D、E

解説：
Spine devices will have no VXLAN gateways: In a typical VXLAN-based architecture with EVPN, spine devices do not function as VXLAN gateways. Their role is to provide connectivity and forwarding for VXLAN traffic, but they do not act as gateways for Layer 2 or Layer 3.
Only the border and leaf devices will have L3 VXLAN gateways: In an EVPN-VXLAN setup, L3 VXLAN gateways are typically placed on the border and leaf devices. These devices are responsible for bridging between Layer 2 and Layer 3 domains, handling routing for traffic that needs to go between different VXLAN segments or between VXLAN and external networks.
All leaf devices will have L2 VXLAN gateways: Leaf devices often function as L2 VXLAN gateways. They handle the bridging between VXLAN segments and provide Layer 2 connectivity for hosts within the same VXLAN.

質問 # 95
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