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| Section | Objectives |
|---|---|
| Topic 1: Data Center Services | - Layer 2 and Layer 3 services - Multicast in data center environments |
| Topic 2: Data Center Underlay (IP Fabric) | - IP fabric design and routing fundamentals - Routing protocols in data center environments |
| Topic 3: Operations, Automation, and Troubleshooting | - Operational best practices - Automation concepts in Junos environments - Network troubleshooting methodologies |
| Topic 4: Data Center Architecture | - Design principles for modern data center networks - Leaf-spine architecture concepts |
| Topic 5: EVPN-VXLAN Overlay | - Interoperability and multitenancy design - EVPN control plane concepts - VXLAN data plane and tunneling |
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NEW QUESTION # 88
Which two statements are true about EVPN routes for Data Center Interconnect? (Choose two.)
Answer: B,C
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 # 89
You are asked to implement Type 2 seamless stitching between two data centers. Which statement is correct in this scenario?
Answer: A
Explanation:
With Type 2 seamless stitching, the inter-data-center extension is built at the data center edges.
The border leaf devices act as the stitching points that terminate and re-originate the VXLAN overlay across the DCI, so the VXLAN tunnels for the interconnect are established between the border leaf devices in each data center.
NEW QUESTION # 90
Exhibit.
You want to enable the border leaf device to send Type 5 routes of local networks to the border leaf device in another data center. What must be changed to the configuration shown in the exhibit to satisfy this requirement?
Answer: A
Explanation:
In this scenario, you want the border leaf device to advertise Type 5 EVPN routes to another border leaf in a different data center. Type 5 routes in EVPN are used to advertise IP prefixes, which means that for proper route advertisement, you need to configure the correct settings within the evpn hierarchy.
Step-by-Step Analysis:
* Understanding EVPN Type 5 Routes:
* EVPN Type 5 routes are used to advertise IP prefixes across EVPN instances, which allow different data centers or networks to exchange routing information effectively.
* VRF Target Setting:
* The vrf-target configuration is crucial because it defines the export and import policies for the VRF within the EVPN instance. For EVPN Type 5 routes to be advertised to other border leaf devices, the vrf-target needs to be correctly configured under the evpn hierarchy, not just within the routing instance.
Command to solve this:
move vrf-target target:65000:1 to evpn
* Other Options:
* Option B:Adding a VLAN configuration would not address the requirement to advertise Type 5 routes.
* Option C:Adding VXLAN encapsulation may be necessary for other scenarios but does not directly address the Type 5 route advertisement.
* Option D:Changing the route-distinguisher will differentiate routes but does not impact the advertisement of Type 5 routes to other data centers.
By moving the vrf-target to the evpn hierarchy, you enable the proper route advertisement, ensuring that the Type 5 routes for local networks are shared with other data center border leaf devices. This is aligned with best practices for multi-data center EVPN implementations, which emphasize the correct placement of routing policies within the EVPN configuration.
NEW QUESTION # 91
You are implementing seamless stitching between two data centers and have a proposedconfiguration for a border leafdevice.
In this scenario, which two statements are correct? {Choose two.)
Answer: B,C
Explanation:
* Understanding Seamless Stitching:
* Seamless stitching is used in EVPN to interconnect two data centers, allowing for consistent Layer 2 and Layer 3 connectivity across them. This is often achieved by translating VNIs (Virtual Network Identifiers) between the data centers.
* Translation-VNI:
* Option B:The translation VNI must be different in each data center to ensure that traffic can be correctly routed and distinguished as it crosses between the data centers. This differentiation helps to maintain the integrity of the traffic flows and prevents any potential overlap or conflict in VNIs.
* Ethernet Segment Identifier (ESI):
* Option D:The ESI must match in both data centers to ensure that the same Ethernet segment (which could be multihomed) is recognized consistently across the data centers. Matching ESIs are crucial for maintaining a unified view of the Ethernet segment across the interconnected fabric.
Conclusion:
* Option B:Correct-Translation VNIs must be unique to each data center for proper traffic distinction.
* Option D:Correct-Matching ESIs are necessary to maintain consistent Ethernet segment identification across both data centers.
NEW QUESTION # 92
You are deploying a Clos IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
* Understanding Oversubscription in a Clos Fabric:
* The oversubscription ratio in a Clos IP fabric measures the ratio of the amount of edge (leaf) bandwidth to the core (spine) bandwidth. An oversubscription ratio of 3:1 means that there is three times more edge bandwidth compared to core bandwidth.
* Impact of Adding/Removing Spine Devices:
* Option C:If youremove spine devices, the total available core bandwidth decreases, while the edge bandwidth remains the same. This results in anincrease in the oversubscription ratio because there is now less core bandwidth to handle the same amount of edge traffic.
* Option B:Conversely, if youadd spine devices, the total core bandwidth increases. This decreases the oversubscription ratio because more core bandwidth is available to handle the edge traffic.
Conclusion:
* Option C:Correct-Removing spine devices increases the oversubscription ratio.
* Option B:Correct-Adding spine devices decreases the oversubscription ratio.
NEW QUESTION # 93
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