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| Section | Objectives |
|---|---|
| Topic 1: Data Center Architecture | - Leaf-spine architecture concepts - Design principles for modern data center networks |
| Topic 2: Data Center Underlay (IP Fabric) | - Routing protocols in data center environments - IP fabric design and routing fundamentals |
| Topic 3: Operations, Automation, and Troubleshooting | - Automation concepts in Junos environments - Operational best practices - Network troubleshooting methodologies |
| Topic 4: Data Center Services | - Layer 2 and Layer 3 services - Multicast in data center environments |
| Topic 5: EVPN-VXLAN Overlay | - EVPN control plane concepts - VXLAN data plane and tunneling - Interoperability and multitenancy design |
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NEW QUESTION # 59
Click the Exhibit button.
The 192.168.0.0/24 route is being advertised into your IP fabric by the leaf device in AS 65512.
Both spine devices receive and advertise the route to all other leaf devices. You must ensure that traffic destined to this network is load-balanced between spine devices.
In this scenario, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
To load-balance traffic from a leaf toward an external prefix learned via both spines, the leaf must install multiple equal BGP next hops for that route and then perform ECMP in the forwarding table. Enabling BGP multipath on the leaf allows it to keep both spine-learned paths active for the same prefix, and applying a forwarding-table load-balancing policy on the leaf ensures traffic is actually distributed across the available next hops.
NEW QUESTION # 60
You are asked to interconnect two of your company's data centers across an IP backbone. Both data centers require Layer 2 and Layer 3 connectivity. In this scenario, which three actions would accomplish this task?
(Choose three.)
Answer: A,B,E
Explanation:
* Layer 2 and Layer 3 Connectivity Requirements:
* To interconnect two data centers across an IP backbone with both Layer 2 (L2) and Layer 3 (L3) connectivity, EVPN-VXLAN (Ethernet VPN with Virtual Extensible LAN) is the ideal solution.
EVPN supports L2 VPNs while also enabling L3 connectivity across multiple locations.
* Necessary EVPN Route Types:
* Type 2 EVPN Routes:These routes are used to advertise MAC addresses for Layer 2 connectivity. They are essential for enabling seamless L2 communication across data centers.
* Type 5 EVPN Routes:These routes are necessary for advertising IP prefixes for Layer 3 connectivity between data centers. They enable the exchange of L3 information across the IP backbone, ensuring routed traffic can reach its destination.
* Border Leaf Nodes:
* Border Leaf Nodes:Ensuring that the border leaf nodes (the entry and exit points for traffic between data centers) can exchange EVPN routes is critical for the correct dissemination of both L2 and L3 information across the data centers.
Conclusion:
* Option A:Correct-Type 2 EVPN routes are required for Layer 2 MAC address learning and communication across the DCI (Data Center Interconnect).
* Option B:Correct-Border leaf nodes need to exchange EVPN routes to maintain connectivity between data centers.
* Option D:Correct-Type 5 EVPN routes are essential for Layer 3 connectivity across the DCI.
OptionsCandEare incorrect because they refer to establishing full mesh VTEPs (VXLAN Tunnel Endpoints) across all spine or leaf nodes, which is unnecessary for the scenario provided. The focus should be on border leaf nodes and appropriate route advertisements for L2 and L3 connectivity.
NEW QUESTION # 61
What are two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN? (Choose two.)
Answer: B,D
Explanation:
An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP
EVPN uses BGP control plane to advertise MAC-to-VTEP mappings and perform VTEP autodiscovery, removing the need for multicast in the underlay.
An EVPN-signaled VXLAN is less resource intensive
Unlike multicast VXLAN, EVPN doesn't rely on flooding unknown traffic via multicast groups in the underlay, reducing bandwidth and CPU usage.
NEW QUESTION # 62
You are implementing seamless stitching between two data centers and have a proposedconfiguration for a border leafdevice.
In this scenario, which two statements are correct? {Choose two.)
Answer: B,D
Explanation:
* Understanding Seamless Stitching:
* Seamless stitching is used in EVPN to interconnect two data centers, allowing for consistent Layer 2 and Layer 3 connectivity across them. This is often achieved by translating VNIs (Virtual Network Identifiers) between the data centers.
* Translation-VNI:
* Option B:The translation VNI must be different in each data center to ensure that traffic can be correctly routed and distinguished as it crosses between the data centers. This differentiation helps to maintain the integrity of the traffic flows and prevents any potential overlap or conflict in VNIs.
* Ethernet Segment Identifier (ESI):
* Option D:The ESI must match in both data centers to ensure that the same Ethernet segment (which could be multihomed) is recognized consistently across the data centers. Matching ESIs are crucial for maintaining a unified view of the Ethernet segment across the interconnected fabric.
Conclusion:
* Option B:Correct-Translation VNIs must be unique to each data center for proper traffic distinction.
* Option D:Correct-Matching ESIs are necessary to maintain consistent Ethernet segment identification across both data centers.
NEW QUESTION # 63
Why is a designated forwarder required in a multihomed CE-to-PE VXLAN environment using EVPN signalling?
Answer: D
NEW QUESTION # 64
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