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| Section | Objectives |
|---|---|
| Data Center Underlay (IP Fabric) | - IP fabric design and routing fundamentals - Routing protocols in data center environments |
| Data Center Architecture | - Leaf-spine architecture concepts - Design principles for modern data center networks |
| EVPN-VXLAN Overlay | - EVPN control plane concepts - VXLAN data plane and tunneling - Interoperability and multitenancy design |
| Data Center Services | - Layer 2 and Layer 3 services - Multicast in data center environments |
| Operations, Automation, and Troubleshooting | - Automation concepts in Junos environments - Network troubleshooting methodologies - Operational best practices |
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問題 #63
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?
答案：B
解題說明：
* Understanding VRF and Routing Instances:
* In an EVPN-VXLAN overlay network, multiple tenants are separated using unique VRF (Virtual Routing and Forwarding) instances. Each VRF instance maintains its own routing table, allowing for isolated routing domains within the same network infrastructure.
* Role of Route Distinguisher:
* Route Distinguisher (RD):The RD is a unique identifier used in MPLS and EVPN environments to distinguish routes belonging to different VRFs. The RD is prepended to the IP address in the route advertisement, ensuring that routes from different tenants remain unique even if they use the same IP address range.
* Correct Property:
* D. the route distinguisher value:This is the correct answer because the RD is crucial in determining which routing information belongs to which VRF instance. It ensures that each VRF' s routing table only contains relevant routes, maintaining isolation between tenants.
Data Center References:
* The RD is a key element in MPLS and EVPN-based multi-tenant environments, ensuring proper routing segregation and isolation for different VRFs within the data center fabric.
問題 #64
You want to convert an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway for VNI 100. You have already configured an IRB interface. In this scenario, which command would you use to accomplish this task?
答案：D
解題說明：
* Scenario Overview:
* Converting an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway involves transitioning the router's functionality from simply bridging traffic within a VXLAN segment to routing traffic between different segments.
* Key Configuration Requirement:
* IRB (Integrated Routing and Bridging) Interface:An IRB interface allows for both Layer 2 switching and Layer 3 routing. To enable routing for a specific VNI (VXLAN Network Identifier), the IRB interface must be associated with the routing function in the corresponding bridge domain.
* Correct Command:
* C. set bridge-domains VLAN-100 routing-interface irb.100:This command correctly binds the IRB interface to the bridge domain, enabling Layer 3 routing functionality within the VXLAN for VNI 100. This effectively transitions the device from operating solely as a Layer 2 gateway to a Layer 3 gateway.
Data Center References:
* This configuration step is essential when converting a Layer 2 VXLAN gateway to a Layer 3 gateway, enabling the MX Series router to route between VXLAN segments.
問題 #65
A local VTEP has two ECMP paths to a remote VTEP.
Which two statements are correct when load balancing is enabled in this scenario? (Choose two.)
答案：C,D
解題說明：
The source port in the UDP header is used to load balance VXLAN traffic: In an ECMP (Equal-Cost Multi-Path) scenario with VXLAN, the source port in the UDP header is one of the fields used to hash the traffic and determine which path to use. This helps distribute traffic across multiple equal-cost paths between VTEPs.
The inner packet fields are used in the hash for load balancing: For VXLAN traffic, the inner packet fields (such as the inner source and destination IP addresses, and sometimes the inner VLAN) are included in the hash calculation to determine the forwarding path. This allows for more effective load balancing across the available paths.
問題 #66
In a centrally-routed bridging (CRB) overlay, which device typically performs the Layer 3 gateway function?
答案：C
解題說明：
In a centrally-routed bridging (CRB) architecture, the IRB interfaces and Layer 3 gateway functionality reside on the spine devices, while the leaf devices operate purely at Layer 2 performing VXLAN bridging. This centralizes routing decisions but can introduce additional hops for inter-VLAN traffic compared to an edge-routed bridging design.
問題 #67
You are deploying an IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
答案：A,D
解題說明：
Adding leaf devices increases the edge bandwidth (workload-facing ports), which lowers the oversubscription ratio because the amount of bandwidth facing the workloads increases relative to the fabric bandwidth.
However, the oversubscription ratio itself remains the same when you add leaf devices if the fabric design and spine capacity remain unchanged because the ratio is a function of edge bandwidth to spine bandwidth. Adding leaf devices without changing spine devices keeps the ratio at the same level.
Removing leaf devices would increase the oversubscription ratio because the amount of edge bandwidth decreases while spine bandwidth remains the same.
問題 #68
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