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| Section | Weight | Objectives |
|---|---|---|
| Data Center Interconnect | 15% | - Layer 2 and Layer 3 interconnect - Inter-fabric stitching - EVPN-VXLAN based DCI |
| EVPN-VXLAN Signaling | 20% | - MBGP for EVPN - CRB and ERB architectures - EVPN concepts and route types - MAC learning and symmetric routing |
| Data Center Architecture and Security | 5% | - Security features in data center networks - Traffic protection and segmentation |
| VXLAN | 20% | - VXLAN configuration and monitoring - VXLAN control plane and data plane operation - VXLAN troubleshooting |
| Data Center Deployment and Management | 20% | - Configuration management and automation - Zero Touch Provisioning (ZTP) - Software upgrades and management |
| Layer 3 Fabrics | 20% | - Routing protocols in IP fabrics - IP fabric architecture and design - Fabric scaling and high availability |
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質問 # 26
Which three statements are correct about VXLAN control planes? (Choose three.)
正解：A、C、E
解説：
EVPN enables fast convergence and updates: EVPN (Ethernet VPN) provides a more scalable and efficient control plane for VXLAN, enabling fast convergence and quicker updates for network changes. This is achieved through the use of BGP (Border Gateway Protocol) as the control plane protocol, which allows for efficient distribution of MAC and IP address information.
Both multicast and EVPN can facilitate MAC learning: Both multicast and EVPN can handle MAC address learning in a VXLAN environment. In multicast-based VXLAN, MAC addresses are learned and distributed via multicast control messages, whereas in EVPN, MAC addresses are distributed via BGP advertisements, which are more efficient and scalable.
Multicast does not require as many resources: Multicast-based VXLAN control planes use standard multicast protocols like PIM (Protocol Independent Multicast) to forward traffic across the VXLAN fabric. While multicast has resource requirements for managing multicast groups, it does not require the same level of control-plane processing as EVPN, which uses BGP to handle MAC address advertisements. However, multicast can be less agile and may require additional configuration.
質問 # 27
You are using EBGP peering in an underlay IP fabric.
Which two statements are correct in this scenario? (Choose two.)
正解：B、D
解説：
Every leaf node has one peering session to every spine node: In an EBGP peering setup within an underlay IP fabric, each leaf node typically establishes a single EBGP session with each spine node. This is a common design for scalability, as it ensures that the leaf nodes can exchange routing information with all spine nodes directly.
EBGP peering does not require an IGP protocol for adjacency establishment: EBGP (External BGP) peering in an underlay IP fabric does not require an IGP (Interior Gateway Protocol) such as OSPF or IS-IS to establish peering relationships. EBGP is used for establishing external routing between different ASes, and within a single AS, the peering is established directly between devices. This eliminates the need for an IGP for the actual EBGP session.
質問 # 28
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?
正解：C
解説：
Border gateway functions occur on border leaf devices: In a collapsed fabric EVPN-VXLAN architecture, the border leaf devices are responsible for interconnecting the data center to external networks (such as the WAN or other data centers). These devices perform the border gateway functions, such as handling routing and bridging for external communication.
質問 # 29
You are deploying multiple Juniper switches al the same location. Your switches are currently using the factory-default configuration.
In this scenario, which two statements are correct? (Choose two.)
正解：A、B
解説：
* DHCP Behavior in Factory-Default Configuration:
* Option B:In the factory-default configuration, Juniper switches are designed to send DHCP requests on all operational interfaces. This behavior ensures that the switch can obtain an IP address for management and further configuration from any available DHCP server.
* Option D:The DHCP server can provide additional configuration parameters, including the required Junos version. This allows for automated provisioning and ensures that the switch is running the correct software version.
Conclusion:
* Option B:Correct-The switch will use any operational interface to request an IP address via DHCP.
* Option D:Correct-The DHCP server can specify Junos version requirements, enabling automated software management.
質問 # 30
Which three statements are correct about symmetric IRB routing with EVPN Type 2 routes? (Choose three.)
正解：A、C、E
解説：
* Symmetric IRB Routing with EVPN Type 2 Routes:
* Symmetric Routing: In symmetric IRB (Integrated Routing and Bridging), routing occurs in both directions at the ingress and egress leaf nodes using the same routing logic. This is contrasted with asymmetric routing, where different routing logic is used depending on the direction of the traffic.
* Required Components:
* Option A:An L3 IRB interface is necessary for each VLAN that participates in routing, as it handles the Layer 3 processing for the VLAN.
* Option B:MAC-VRF is required for symmetric routing to maintain a mapping of MAC addresses to the appropriate VRF, ensuring correct forwarding within the EVPN.
* Option D:A transit VNI (Virtual Network Identifier) is required for each VRF to encapsulate the Layer 3 traffic as it traverses the network, allowing the IP traffic to be appropriately forwarded.
Conclusion:
* Option A:Correct-Each local VLAN needs an IRB interface for L3 processing.
* Option B:Correct-MAC-VRF is necessary for handling MAC address resolution in symmetric routing.
* Option D:Correct-Transit VNIs are required for routing VRF-specific traffic across the network.
OptionsCandEare incorrect because:
* C:Symmetric routing can work with various VLAN models, including single or multiple VLANs within an EVPN instance.
* E:Symmetric routing is generally more efficient than asymmetric routing as it uses consistent routing logic in both directions.
質問 # 31
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