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問題 #79
You manage an IP fabric with an EVPN-VXLAN overlay. You have multiple tenants separated using multiple unique VRF instances. You want to determine the routing information that belongs in each routing instance's routing table.
In this scenario, which property is used for this purpose?
答案：C
解題說明：
In an EVPN-VXLAN overlay, the route distinguisher (RD) is used to uniquely identify routes in different VRFs (Virtual Routing and Forwarding instances). The RD allows the same IP address to be used in different VRFs, making sure the routing information for each tenant is separated.
The RD value ensures that each routing instance (or VRF) has its own unique address space and routing table entries.
問題 #80
In a centrally-routed bridging (CRB) overlay, which device typically performs the Layer 3 gateway function?
答案：C
解題說明：
In a centrally-routed bridging (CRB) architecture, the IRB interfaces and Layer 3 gateway functionality reside on the spine devices, while the leaf devices operate purely at Layer 2 performing VXLAN bridging. This centralizes routing decisions but can introduce additional hops for inter-VLAN traffic compared to an edge-routed bridging design.
問題 #81
What are three actions available tor MAC move limiting? (Choose three.)
答案：B,C,E
解題說明：
* MAC Move Limiting:
* 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.
* Available Actions:
* A. drop:This action drops packets from the MAC address if it violates the move limit, effectively blocking communication from the offending MAC address.
* D. log:This action logs the MAC move event without disrupting traffic, allowing network administrators to monitor and investigate the event.
* E. 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.
* Other Actions (Not Correct):
* B. filter:Filtering is not typically associated with MAC move limiting; it generally refers to applying ACLs or other mechanisms to filter traffic.
* C. enable:This is not an action related to MAC move limiting, as it does not represent a specific reaction to a MAC move event.
Data Center References:
* MAC move limiting is crucial for maintaining network stability and security, particularly in environments with dynamic or large-scale Layer 2 networks where MAC addresses might frequently change locations.
問題 #82
Which two statements are correct about storm control in a Junos EVPN-VXLAN fabric? (Choose two.)
答案：C,D
解題說明：
Storm control is a Layer 2 feature that monitors broadcast, unknown unicast, and multicast (BUM) traffic levels on an interface and takes a configured action, such as dropping excess traffic or disabling the interface, when a defined threshold is exceeded. This protects the fabric from broadcast storms but does not replace the Designated Forwarder election process, which handles duplicate BUM traffic delivery in multihomed scenarios.
問題 #83
You are deploying an EVPN-VXLAN overlay. You must ensure that Layer 3 routing happens on the spine devices. In this scenario, which deployment architecture should you use?
答案：C
解題說明：
* Understanding EVPN-VXLAN Architectures:
* EVPN-VXLAN overlays allow for scalable Layer 2 and Layer 3 services in modern data centers.
* CRB (Centralized Routing and Bridging):In this architecture, the Layer 3 routing is centralized on spine devices, while the leaf devices focus on Layer 2 switching and VXLAN tunneling. This setup is optimal when the goal is to centralize routing for ease of management and to avoid complex routing at the leaf level.
* ERB (Edge Routing and Bridging):This architecture places routing functions on the leaf devices, making it a distributed model where each leaf handles routing for its connected hosts.
* Architecture Choice for Spine Routing:
* Given the requirement to ensure Layer 3 routing happens on the spine devices, theCRB (Centralized Routing and Bridging)architecture is the correct choice. This configuration offloads routing tasks to the spine, centralizing control and potentially simplifying the overall design.
* Explanation:
* With CRB, the spine devices perform all routing between VXLAN segments. Leaf switches handle local switching and VXLAN encapsulation, but routing decisions are centralized at the spine level.
* This model is particularly advantageous in scenarios where centralized management and routing control are desired, reducing the complexity and configuration burden on the leaf switches.
Data Center References:
* The CRB architecture is commonly used in data centers where centralized control and simplified management are key design considerations. It allows the spines to act as the primary routing engines, ensuring that routing is handled in a consistent and scalable manner across the fabric.
問題 #84
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