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| Section | Objectives |
|---|---|
| Topic 1: Data Center Services | - Layer 2 and Layer 3 services - Multicast in data center environments |
| Topic 2: Operations, Automation, and Troubleshooting | - Network troubleshooting methodologies - Operational best practices - Automation concepts in Junos environments |
| 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: EVPN-VXLAN Overlay | - EVPN control plane concepts - Interoperability and multitenancy design - VXLAN data plane and tunneling |
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NEW QUESTION # 113
You are asked to build redundant gateways in your EVPN-VXLAN environment, but you must conserve address space because these gateways must span across seven PEs.
What should you implement on the PEs to satisfy these requirements?
Answer: C
Explanation:
In an EVPN-VXLAN environment, when you need redundant gateways across multiple PEs (for hosts in the same VLAN/VRF), you want all PEs to present a single logical gateway IP to the hosts.
This is achieved using anycast IRB:
Same IP address on all PEs → ensures hosts have a single default gateway.
Same MAC address on all PEs → ensures traffic is correctly forwarded to the closest PE without ARP conflicts.
This design conserves IP address space because you don't need a unique gateway IP for each PE.
NEW QUESTION # 114
Exhibit.
Referring to the exhibit, which statement Is true?
Answer: C
Explanation:
* Understanding Network Architectures:
* ERB (Edge Routed Bridging) architecture involves routing at the network's edge (leaf nodes), while traffic between leaf nodes is switched. This is commonly used in VXLAN-EVPN setups.
* Analysis of the Exhibit:
* The exhibit shows configurations related to routing instances, VXLAN, and VLANs, with VNIs being used for each VLAN. This setup is characteristic of an ERB architecture where each leaf device handles Layer 3 routing for its connected devices.
Conclusion:
* Option B:Correct-The configuration shown corresponds to an ERB architecture where routing occurs at the network's edge (leaf devices).
NEW QUESTION # 115
You are using a single tenant data center with a bridged overlay architecture. In this scenario, how do hosts of the different virtual networks communicate with each other?
Answer: A
Explanation:
In a single-tenant data center using a bridged overlay architecture, virtual networks (VLANs) are typically isolated within the fabric, with traffic between these VLANs handled outside the fabric.
off-fabric using an external device: In many bridged overlay architectures, communication between different virtual networks is handled off-fabric, often using an external router or firewall that connects the different VLANs. The fabric itself primarily provides Layer 2 connectivity within each VLAN, leaving inter-VLAN routing to be handled externally.
This design is common in smaller or simpler data center environments where a single tenant does not require complex on-fabric routing and prefers to handle inter-VLAN routing through dedicated devices.
NEW QUESTION # 116
Exhibit.
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:
* Review of the Exhibit:
* The exhibit shows the switch configuration for Leaf-1 and Leaf-2. The configurations include route distinguishers, VRF targets, and service IDs, all of which are crucial for ensuring proper operation in an EVPN-VXLAN environment.
* Service-ID Consistency:
* The service ID must be consistent across all participating leaf devices in the same EVPN instance to ensure that they are part of the same VXLAN overlay network.
* VRF Target Consistency:
* The vrf-target parameter must also be consistent across devices to ensure that VRFs (Virtual Routing and Forwarding instances) are correctly imported and exported between leaf nodes.
Conclusion:
* Option B:Correct-Setting the same service-id on Leaf-2 ensures that it is part of the same VXLAN overlay as Leaf-1.
* Option D:Correct-The vrf-target on Leaf-2 should match Leaf-1 to ensure consistent routing policies and proper route exchange.
NEW QUESTION # 117
Exhibit.
Referring to the exhibit, Host1 (10.1.1.1) is failing to communicate with Host2 (10.1.2.1) in a data center that uses an ERB architecture. What do you determine from the output?
Answer: A
Explanation:
Understanding the Problem:
* Host1 (10.1.1.1) is failing to communicate with Host2 (10.1.2.1) within an EVPN-VXLAN environment using ERB architecture.
Analysis of the Exhibit:
* The provided output includes information from the show route forwarding-table matching command for IP 10.1.2.1. The next hop is shown as vtep.32769, which indicates that the traffic destined for 10.1.2.1 is being forwarded into the VXLAN tunnel with the correct VTEP (VXLAN Tunnel Endpoint).
Conclusion:
* Option B:Correct-The traffic from Host1 is entering the VXLAN tunnel, as evidenced by the next hop pointing to a VTEP. However, the issue could lie elsewhere, possibly with the remote VTEP, routing configurations, or the receiving leaf/spine devices.
NEW QUESTION # 118
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