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| Section | Objectives |
|---|---|
| Topic 1: Operations, Automation, and Troubleshooting | - Network troubleshooting methodologies - Operational best practices - Automation concepts in Junos environments |
| Topic 2: EVPN-VXLAN Overlay | - VXLAN data plane and tunneling - Interoperability and multitenancy design - EVPN control plane concepts |
| Topic 3: Data Center Underlay (IP Fabric) | - Routing protocols in data center environments - IP fabric design and routing fundamentals |
| Topic 4: Data Center Architecture | - Leaf-spine architecture concepts - Design principles for modern data center networks |
| Topic 5: Data Center Services | - Multicast in data center environments - Layer 2 and Layer 3 services |
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NEW QUESTION # 108
You are deploying an IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
Answer: B,D
Explanation:
Adding leaf devices increases the edge bandwidth (workload-facing ports), which lowers the oversubscription ratio because the amount of bandwidth facing the workloads increases relative to the fabric bandwidth.
However, the oversubscription ratio itself remains the same when you add leaf devices if the fabric design and spine capacity remain unchanged because the ratio is a function of edge bandwidth to spine bandwidth. Adding leaf devices without changing spine devices keeps the ratio at the same level.
Removing leaf devices would increase the oversubscription ratio because the amount of edge bandwidth decreases while spine bandwidth remains the same.
NEW QUESTION # 109
You are asked to interconnect two of your company's data centers across the IP backbone. Both data centers have their own unique IP space and do not require any bridging. In this scenario, which two actions would accomplish this task? (Choose two.)
Answer: A,B
Explanation:
* Interconnecting Data Centers:
* The scenario requires interconnecting two data centers with unique IP spaces across an IP backbone. The key point is that bridging is not required, so Layer 3 routing methods must be used.
* EVPN Configuration:
* Option B:Establishing EVPN peering between the border leaf nodes in each data center is the most appropriate solution as it allows for exchanging routing information between the two data centers. This ensures that the routes are properly distributed without the need for L2 bridging.
* Option C:Configuring Type 5 EVPN routes is necessary for advertising IP prefixes (Layer 3 routes) across the EVPN. Type 5 routes allow for the exchange of IP prefixes between the two data centers, enabling the necessary routing functionality without the need for bridging.
Conclusion:
* Option B:Correct-Peering between border leaf nodes sets up the necessary route exchange between data centers.
* Option C:Correct-Type 5 EVPN routes are essential for exchanging Layer 3 prefixes between data centers.
NEW QUESTION # 110
Exhibit.
You want to enable the border leaf device to send Type 5 routes of local networks to the border leaf device in another data center. What must be changed to the configuration shown in the exhibit to satisfy this requirement?
Answer: A
Explanation:
In this scenario, you want the border leaf device to advertise Type 5 EVPN routes to another border leaf in a different data center. Type 5 routes in EVPN are used to advertise IP prefixes, which means that for proper route advertisement, you need to configure the correct settings within the evpn hierarchy.
Step-by-Step Analysis:
* Understanding EVPN Type 5 Routes:
* EVPN Type 5 routes are used to advertise IP prefixes across EVPN instances, which allow different data centers or networks to exchange routing information effectively.
* VRF Target Setting:
* The vrf-target configuration is crucial because it defines the export and import policies for the VRF within the EVPN instance. For EVPN Type 5 routes to be advertised to other border leaf devices, the vrf-target needs to be correctly configured under the evpn hierarchy, not just within the routing instance.
Command to solve this:
move vrf-target target:65000:1 to evpn
* Other Options:
* Option B:Adding a VLAN configuration would not address the requirement to advertise Type 5 routes.
* Option C:Adding VXLAN encapsulation may be necessary for other scenarios but does not directly address the Type 5 route advertisement.
* Option D:Changing the route-distinguisher will differentiate routes but does not impact the advertisement of Type 5 routes to other data centers.
By moving the vrf-target to the evpn hierarchy, you enable the proper route advertisement, ensuring that the Type 5 routes for local networks are shared with other data center border leaf devices. This is aligned with best practices for multi-data center EVPN implementations, which emphasize the correct placement of routing policies within the EVPN configuration.
NEW QUESTION # 111
Click the Exhibit button. Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
Referring to the exhibit, which two configuration changes are required to solve the problem?
(Choose two.)
Answer: B,C
Explanation:
Configure the set switch-options vrf-target target:65000:1 parameter on Leaf-2: The vrf- target parameter on Leaf-2 must match the vrf-target on Leaf-1 to ensure that both leaves use the same routing information for their respective VRFs. In the configuration, Leaf-1 has vrf-target target:65000:1, while Leaf-2 has vrf-target target:65000:2. These must be consistent to allow proper communication and routing between the leaves.
Configure the set switch-options service-id 1 parameter on Leaf-2: The service-id configuration should be consistent across all leaf nodes to ensure that they are part of the same VXLAN service. Leaf-1 is configured with service-id 1, so Leaf-2 should be configured with the same service-id 1 to ensure consistency in the VXLAN deployment.
NEW QUESTION # 112
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?
Answer: B
Explanation:
* 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.
NEW QUESTION # 113
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