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| Section | Objectives |
|---|---|
| Data Center Architecture | - Leaf-spine architecture concepts - Design principles for modern data center networks |
| Data Center Services | - Multicast in data center environments - Layer 2 and Layer 3 services |
| EVPN-VXLAN Overlay | - VXLAN data plane and tunneling - EVPN control plane concepts - Interoperability and multitenancy design |
| Operations, Automation, and Troubleshooting | - Automation concepts in Junos environments - Network troubleshooting methodologies - Operational best practices |
| Data Center Underlay (IP Fabric) | - Routing protocols in data center environments - IP fabric design and routing fundamentals |
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NEW QUESTION # 38
Whatare two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN?
(Choose two.)
Answer: A,B
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 # 39
You are implementing seamless stitching between two data centers and have a proposed configuration for a border leaf device.
In this scenario, which two statements are correct? {Choose two.)
Answer: A,D
Explanation:
When implementing seamless VXLAN stitching between two data centers, the Ethernet Segment Identifier (ESI) must match in both data centers to ensure that the same multi-homed segment is recognized consistently across the environments. This allows seamless failover and redundancy. However, the translation VNI (Virtual Network Identifier) must be different in each data center because VXLAN stitching involves mapping different VNIs to enable interconnectivity between distinct VXLAN domains.
If the same translation VNI is used in both data centers, there would be no differentiation between network segments, leading to potential routing and forwarding issues. Keeping them different ensures proper traffic isolation and mapping.
NEW QUESTION # 40
Click the Exhibit button. Referring to the exhibit, you have configured the underlay and overlay for an IP fabric. The underlay sessions are established without problems, but the overlay sessions remain in the active state. What should you do to solve this problem?
Answer: D
Explanation:
The EVPN overlay sessions use loopback addresses as BGP endpoints, so the leaf must have IP reachability to the spine loopbacks (and vice versa) through the underlay. With only the directly connected underlay links working, the fabric is missing the loopback routes needed for the overlay TCP sessions, leaving them stuck in Active. Exporting the local loopback into the underlay ensures those /32 routes are carried across the fabric so the overlay neighbors become reachable and the sessions establish.
NEW QUESTION # 41
Which parameter is used to associate a received route with a local VPN route table?
Answer: A
Explanation:
route-target community: The route-target community is used to associate a received route with a local VPN route table in an EVPN or MPLS VPN environment. It acts as an import and export policy for routes, ensuring that only the relevant routes are imported into a particular VRF (Virtual Routing and Forwarding instance) based on the matching route-target.
NEW QUESTION # 42
A Junos switch boots with a factory-default or zeroized configuration and the ZTP process takes over. Which three statements are correct about this ZTP process? (Choose three.)
Answer: A,C,D
Explanation:
During Zero Touch Provisioning, the switch first uses DHCP to obtain an IP address and provisioning parameters. It can receive software image information through DHCP options and verify or download the specified Junos version if required. It then retrieves and applies the assigned configuration file automatically to complete provisioning.
NEW QUESTION # 43
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