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| Section | Objectives |
|---|---|
| Topic 1: EVPN-VXLAN Overlay | - Interoperability and multitenancy design - EVPN control plane concepts - VXLAN data plane and tunneling |
| Topic 2: Data Center Services | - Layer 2 and Layer 3 services - Multicast in data center environments |
| Topic 3: Operations, Automation, and Troubleshooting | - Automation concepts in Junos environments - Operational best practices - Network troubleshooting methodologies |
| Topic 4: Data Center Architecture | - Design principles for modern data center networks - Leaf-spine architecture concepts |
| Topic 5: Data Center Underlay (IP Fabric) | - IP fabric design and routing fundamentals - Routing protocols in data center environments |
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NEW QUESTION # 115
Click the Exhibit button.
You are reviewing a configuration for an EVPN VLAN-bundle service. The configuration commits successfully, but the hosts connected to the MAC-VRF do not communicate correctly.
Referring to the exhibit, which two actions should you take to solve the problem? (Choose two.)
Answer: B,C
Explanation:
An EVPN VLAN-bundle service requires the routing instance service type to be set to VLAN- bundle so multiple VLANs can be mapped into a single bundled service. VLAN-bundle is a Layer
2 EVPN service and is not meant to have an IRB attached inside the MAC-VRF, so the IRB interface association must be removed to restore correct host-to-host bridging behavior.
NEW QUESTION # 116
Which two statements are true about EVPN routes for Data Center Interconnect? (Choose two.)
Answer: C,D
Explanation:
Type 5 EVPN routes (IP Prefix Routes) are used for Layer 3 (IP) interconnects between data centers. These routes do not require a VXLAN tunnel because they are IP-routed instead of being MAC-based like Type 2 routes. The next-hop resolution happens at the IP layer, not at the VXLAN tunnel level.
Type 2 EVPN routes (MAC/IP Advertisement Routes) are used to transport MAC addresses and associated IP addresses of endpoints. Since Type 2 routes are Layer 2-based, they require a VXLAN tunnel between the VTEPs (Virtual Tunnel Endpoints) to forward Ethernet frames correctly.
NEW QUESTION # 117
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: A,C
Explanation:
Configure the set switch-options service-id 1 parameter on Leaf-2: The service ID parameter should be consistent between the two leaf switches in order to ensure proper EVPN operation.
The service ID helps to associate the EVPN instance with the correct context. Configuring the same service-id 1on both Leaf-1 and Leaf-2 will allow them to properly intercommunicate.
Configure the set switch-options vrf-target target:65000:55 parameter on Leaf-2: The vrf- targetdefines the routing target for VRF routes in the EVPN context. Since Leaf-1 has vrf- target target:65000:55, Leaf-2 must also have the same VRF target to ensure consistent route propagation between the two switches.
NEW QUESTION # 118
In an EVPN-VXLAN fabric, which statement describes the purpose of an EVPN Type 5 route?
Answer: D
Explanation:
EVPN Type 5 routes, also known as IP Prefix routes, are used to advertise Layer 3 reachability information for subnets or host routes across VXLAN domains. This allows inter-subnet routing between different VNIs or between data centers without requiring the destination MAC address to be known, which is especially useful for DCI scenarios and route summarization.
NEW QUESTION # 119
Whatare two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN?
(Choose two.)
Answer: B,C
Explanation:
* Multicast-Signaled VXLAN:
* In traditional multicast-signaled VXLAN, VTEPs (VXLAN Tunnel Endpoints) use multicast to flood and learn about remote VTEPs. This method relies on multicast in the underlay network to distribute BUM (Broadcast, Unknown unicast, and Multicast) traffic.
* This approach can be resource-intensive due to the need for multicast group management and increased network traffic, especially in large deployments.
* EVPN-Signaled VXLAN:
* EVPN-signaled VXLAN uses BGP (Border Gateway Protocol) to signal the presence of VTEPs and distribute MAC address information. BGP is used for VTEP autodiscovery and the distribution of endpoint information.
* This method is more efficient because it reduces the reliance on multicast, instead using BGP control-plane signaling to handle VTEP discovery and MAC learning, which reduces the overhead on the network and improves scalability.
* Correct Statements:
* B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP:This is correct because EVPN uses BGP for VTEP autodiscovery, making it more efficient and scalable compared to multicast-based methods.
* C. An EVPN-signaled VXLAN is less resource-intensive:This is correct because it eliminates the need for multicast flooding in the underlay, instead using BGP for signaling, which is less demanding on network resources.
* Incorrect Statements:
* A. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using IS-IS:This is incorrect because EVPN relies on BGP, not IS-IS, for VTEP discovery and signaling.
* D. An EVPN-signaled VXLAN features slower and more complete convergence:This is incorrect; EVPN with BGP typically provides faster convergence due to its use of a control plane rather than relying on data plane learning.
Data Center References:
* EVPN-VXLAN is widely adopted in modern data center designs due to its scalability, efficiency, and reduced resource consumption compared to multicast-based VXLAN solutions. It leverages the strengths of BGP for control-plane-driven operations, resulting in more efficient and scalable networks.
NEW QUESTION # 120
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