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| Section | Objectives |
|---|---|
| Operations, Automation, and Troubleshooting | - Automation concepts in Junos environments - Network troubleshooting methodologies - Operational best practices |
| EVPN-VXLAN Overlay | - Interoperability and multitenancy design - EVPN control plane concepts - VXLAN data plane and tunneling |
| Data Center Architecture | - Leaf-spine architecture concepts - Design principles for modern data center networks |
| Data Center Underlay (IP Fabric) | - Routing protocols in data center environments - IP fabric design and routing fundamentals |
| Data Center Services | - Multicast in data center environments - Layer 2 and Layer 3 services |
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92. Frage
Click the Exhibit button.
You have implemented an ERB overlay topology with an EBGP underlay. VXLAN tunnels are forming with the spine device as the VTEP.
Referring to the exhibit, which change must be made to the group overlay configuration?
Antwort: A
Begründung:
In an eBGP EVPN overlay, the spine will, by default, rewrite the BGP next-hop when advertising EVPN routes to other peers, which makes the spine appear as the VTEP and causes VXLAN tunnels to form toward it. Enabling the no-nexthop-change behavior preserves the original leaf's VTEP next-hop so VXLAN tunnels form between the leaf VTEPs instead of to the spine.
93. Frage
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?
Antwort: D
Begründung:
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.
94. Frage
Which parameter is used to associate a received route with a local VPN route table?
Antwort: A
Begründung:
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.
95. Frage
You are implementing VXLAN broadcast domains in your data center environment. Which two statements are correct in this scenario? (Choose two.)
Antwort: C,D
Begründung:
* VXLAN Overview:
* VXLAN (Virtual Extensible LAN) is a network virtualization technology that encapsulates Layer
2 Ethernet frames into Layer 3 UDP packets for transmission over an IP network. It allows the creation of Layer 2 overlay networks across a Layer 3 infrastructure.
* Understanding VXLAN Components:
* VTEP (VXLAN Tunnel Endpoint):A VTEP is responsible for encapsulating and decapsulating Ethernet frames into and from VXLAN packets.
* VNI (VXLAN Network Identifier):A 24-bit identifier used to distinguish different VXLAN segments, allowing for up to 16 million unique segments.
* Correct Statements:
* C. Layer 2 frames are encapsulated by the source VTEP:This is correct. In a VXLAN deployment, the source VTEP encapsulates the original Layer 2 Ethernet frame into a VXLAN packet before transmitting it over the IP network to the destination VTEP, which then decapsulates it.
* A. A VXLAN packet does not contain a VLAN ID:This is correct. The VXLAN header does not carry the original VLAN ID; instead, it uses the VNI to identify the network segment. The VLAN ID is local to the switch and does not traverse the VXLAN tunnel.
* Incorrect Statements:
* B. The VNI must match the VLAN tag to ensure that the remote VTEP can decapsulate VXLAN packets:This is incorrect. The VNI is independent of the VLAN tag, and the VLAN ID does not need to match the VNI. The VNI is what the remote VTEP uses to identify the correct VXLAN segment.
* D. The VNI is a 16-bit value and can range from 0 through 16,777,215:This is incorrect because the VNI is a 24-bit value, allowing for a range of 0 to 16,777,215.
Data Center References:
* VXLAN technology is critical for modern data centers as it enables scalability and efficient segmentation without the constraints of traditional VLAN limits.
96. Frage
Exhibit.
You are troubleshooting a DCI connection to another data center The BGP session to the provider is established, but the session to Border-Leaf-2 is not established. Referring to the exhibit, which configuration change should be made to solve the problem?
Antwort: B
Begründung:
* Understanding the Configuration:
* The exhibit shows a BGP configuration on a Border-Leaf device. The BGP group UNDERLAY is used for the underlay network, OVERLAY for EVPN signaling, and PROVIDER for connecting to the provider network.
* The OVERLAY group has the accept-remote-nexthop statement, which is designed to accept the next-hop address learned from the remote peer as is, without modifying it.
* Problem Identification:
* The BGP session to Border-Leaf-2 is not established. A common issue in EVPN-VXLAN environments is related to next-hop reachability, especially when accept-remote-nexthop is configured.
* In typical EVPN-VXLAN setups, the next-hop address should be reachable within the overlay network. However, the accept-remote-nexthop can cause issues if the next-hop IP address is not directly reachable or conflicts with the expected behavior in the overlay.
* Corrective Action:
* D. delete protocols bgp group OVERLAY accept-remote-nexthop:Removing this command will ensure that the device uses its own IP address as the next-hop in BGP advertisements, which is standard practice in many EVPN-VXLAN setups. This change should help establish the BGP session with Border-Leaf-2.
Data Center References:
* Proper handling of BGP next-hop attributes is critical in establishing and maintaining stable BGP sessions, especially in complex multi-fabric environments like EVPN-VXLAN. Removing accept- remote-nexthop aligns with best practices in many scenarios.
97. Frage
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