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質問 # 12
You manage an IP fabric with an EVPN-VXLAN overlay. You have multiple tenants separated using multiple unique VRF instances. You want to determine the routing information that belongs in each routing instance's routing table.
In this scenario, which property is used for this purpose?
正解：D
解説：
In an EVPN-VXLAN overlay, the route distinguisher (RD) is used to uniquely identify routes in different VRFs (Virtual Routing and Forwarding instances). The RD allows the same IP address to be used in different VRFs, making sure the routing information for each tenant is separated.
The RD value ensures that each routing instance (or VRF) has its own unique address space and routing table entries.
質問 # 13
You are deploying an EVPN-VXLAN overlay. You must ensure that Layer 3 routing happens on the spine devices. In this scenario, which deployment architecture should you use?
正解：C
解説：
* Understanding EVPN-VXLAN Architectures:
* EVPN-VXLAN overlays allow for scalable Layer 2 and Layer 3 services in modern data centers.
* CRB (Centralized Routing and Bridging):In this architecture, the Layer 3 routing is centralized on spine devices, while the leaf devices focus on Layer 2 switching and VXLAN tunneling. This setup is optimal when the goal is to centralize routing for ease of management and to avoid complex routing at the leaf level.
* ERB (Edge Routing and Bridging):This architecture places routing functions on the leaf devices, making it a distributed model where each leaf handles routing for its connected hosts.
* Architecture Choice for Spine Routing:
* Given the requirement to ensure Layer 3 routing happens on the spine devices, theCRB (Centralized Routing and Bridging)architecture is the correct choice. This configuration offloads routing tasks to the spine, centralizing control and potentially simplifying the overall design.
* Explanation:
* With CRB, the spine devices perform all routing between VXLAN segments. Leaf switches handle local switching and VXLAN encapsulation, but routing decisions are centralized at the spine level.
* This model is particularly advantageous in scenarios where centralized management and routing control are desired, reducing the complexity and configuration burden on the leaf switches.
Data Center References:
* The CRB architecture is commonly used in data centers where centralized control and simplified management are key design considerations. It allows the spines to act as the primary routing engines, ensuring that routing is handled in a consistent and scalable manner across the fabric.
質問 # 14
You are deploying an IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
正解：B、C
解説：
* Understanding Oversubscription Ratio in IP Fabrics:
* The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.
* Impact of Adding or Removing Leaf Devices:
* Removing Leaf Devices:When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio toincreasebecause there is now less total bandwidth to distribute across the same amount of spine bandwidth.
* Adding Leaf Devices:Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.
Conclusion:
* Option C:Correct-Removing leaf devices increases the oversubscription ratio.
* Option D:Correct-Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.
質問 # 15
You are designing a DCI solution and want to prevent the extension of BUM traffic and Ethernet Segment information between data centers while still allowing IP prefix reachability. Which EVPN seamless stitching type should you use?
正解：A
解説：
When only Layer 3 reachability between data centers is desired, and Layer 2 extension along with associated BUM traffic and Ethernet Segment routes should not cross the DCI, a Type 5 (IP Prefix route) only interconnect is used. Border leaf devices exchange only EVPN Type 5 routes across the DCI, providing inter-subnet routing between data centers while keeping each data center's Layer 2 broadcast domain isolated.
質問 # 16
You are preparing an sFlow monitoring system configuration. In this scenario, what information will be included in the datagram sent to the sFlow collector? (Choose two.)
正解：A、C
解説：
An sFlow datagram includes packet sample information with ingress interface details so the collector can identify where the sampled traffic entered the device. It also carries Layer 2 header information from the sampled frame, which includes VLAN tags, allowing the collector to determine the source and destination VLAN associated with the sampled traffic.
質問 # 17
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