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NEW QUESTION # 56
Which two statements are true about a pure IP fabric? (Choose two.)
Answer: B,C
Explanation:
An IP fabric does not support Layer 2 protocols: A pure IP fabric is designed to work primarily at Layer 3 and does not require Layer 2 protocols like spanning tree or VLANs for operation. It focuses on IP-based routing and forwarding, and Layer 2 protocols are not typically used within the fabric itself.
Devices in an IP fabric function as Layer 3 routers: In a pure IP fabric, devices (typically leaf and spine switches) operate primarily as Layer 3 routers. They are responsible for routing IP traffic across the fabric, with VXLAN or other tunneling technologies used for overlay and encapsulation.
NEW QUESTION # 57
Which two statements are correct about EVPN Type 1 routes? (Choose two.)
Answer: B,C
Explanation:
EVPN Type 1 routes, also called Ethernet Auto-Discovery (AD) routes, are advertised per Ethernet Segment and per EVI. They allow a PE device to signal information about a locally attached Ethernet Segment, and when a link to a multihomed segment fails, a single Type 1 route withdrawal (mass withdrawal) can quickly inform remote PEs to redirect traffic, significantly speeding up convergence compared to withdrawing individual MAC routes.
NEW QUESTION # 58
Exhibit.
Given the configuration shown in the exhibit, why has the next hop remained the same for the EVPN routes advertised to the peer 203.0.113.2?
Answer: B
Explanation:
* Understanding the Configuration:
* The configuration shown in the exhibit involves an EVPN (Ethernet VPN) setup using BGP as the routing protocol. The export policy named CHANGE_NH is applied to the BGP group evpn- peer, which includes a rule to change the next hop for routes that match the policy.
* Issue with Next Hop Not Changing:
* The policy CHANGE_NH is correctly configured to change the next hop to 203.0.113.10 for the matching routes. However, the next hop remains unchanged when advertising EVPN routes to the peer 203.0.113.2.
* Reason for the Issue:
* In Junos OS, when exporting routes for VPNs (including EVPN), the next-hop change defined in a policy will not take effect unless the vpn-apply-export parameter is used inthe BGP configuration. This parameter ensures that the export policy is applied specifically to VPN routes.
* The vpn-apply-export parameter must be included to apply the next-hop change to EVPN routes.
* Correct Answer Explanation:
* D. The vpn-apply-export parameter must be applied to this peer:This is the correct solution because the next hop in EVPN routes won't be altered without this parameter in the BGP configuration. It instructs the BGP process to apply the export policy to the EVPN routes.
Data Center References:
* This behavior is standard in EVPN deployments with Juniper Networks devices, where the export policies applied to VPN routes require explicit invocation using vpn-apply-export to take effect.
NEW QUESTION # 59
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,B
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 # 60
Exhibit.
You have implemented an EVPN-VXLAN data center. Device served must be able to communicate with device server2.
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
* Understanding the Exhibit Setup:
* The network diagram shows an EVPN-VXLAN setup, a common design for modern data centers enabling Layer 2 and Layer 3 services over an IP fabric.
* Leaf1 and Leaf2 are the leaf switches connected to Server1 and Server2, respectively, with each server in a different subnet (172.16.1.0/24 and 172.16.2.0/24).
* Spine1 and Spine2 are part of the IP fabric, interconnecting the leaf switches.
* EVPN-VXLAN Basics:
* EVPN (Ethernet VPN) provides Layer 2 and Layer 3 VPN services using MP-BGP.
* VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets for transmission across an IP network.
* VTEP (VXLAN Tunnel Endpoint) interfaces on leaf devices handle VXLAN encapsulation and decapsulation.
* Integrated Routing and Bridging (IRB):
* IRB interfaces are required on leaf1 and leaf2 (where the endpoints are directly connected) to route between different subnets (in this case, between 172.16.1.0/24 and 172.16.2.0/24).
* The IRB interfaces provide the necessary L3 gateway functions for inter-subnet communication.
* Traffic Flow Analysis:
* Traffic from Server1 (172.16.1.1) destined for Server2 (172.16.2.1) must traverse from leaf1 to leaf2.
* The traffic will be VXLAN encapsulated on leaf1, sent over the IP fabric, and decapsulated on leaf2.
* Since the communication is between different subnets, the IRB interfaces on leaf1 and leaf2 are crucial for routing the traffic correctly.
* Correct Statements:
* C. An IRB Interface must be configured on leaf1 and leaf2:This is necessary to perform the inter-subnet routing for traffic between Server1 and Server2.
* D. Traffic from server1 to server2 will transit the VXLAN tunnel between leaf1 and leaf2:
This describes the correct VXLAN operation where the traffic is encapsulated by leaf1 and decapsulated by leaf2.
Data Center References:
* In EVPN-VXLAN architectures, the leaf switches often handle both Layer 2 switching and Layer 3 routing via IRB interfaces. This allows for efficient routing within the data center fabric without the need to involve the spine switches for every routing decision.
* The described traffic flow aligns with standard EVPN-VXLAN designs, where direct VXLAN tunnels between leaf switches enable seamless and scalable communication across a data center network.
NEW QUESTION # 61
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