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| Section | Objectives |
|---|---|
| Topic 1: SR Linux Data Center Architecture | - SR Linux system fundamentals
|
| Topic 2: EVPN Fundamentals | - EVPN architecture and control plane
|
| Topic 3: Data Center Interconnect (DCI) | - Interconnecting data centers with EVPN
|
| Topic 4: BGP EVPN Control Plane Operations | - Multi-homing scenarios
|
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NEW QUESTION # 41
Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?
Answer: C
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In asymmetric L3 EVPN routing, the ingress PE performs the routing decision and then sends traffic across the overlay in the context of the destination MAC-VRF. The egress PE performs Layer 2 MAC forwarding only toward the destination host. This is why options A and B correctly describe asymmetric data-plane behavior. Asymmetric routing relies heavily on EVPN route type 2 MAC/IP Advertisement routes because the ingress PE must know the destination host's MAC/IP binding and the destination bridge domain information. EVPN route type 5, which advertises IP prefixes, is a symmetric L3 EVPN mechanism and is not mandatory for asymmetric routing. Therefore, option C is false. Option D is treated as correct in this asymmetric-routing model because each PE participating in inter-subnet forwarding needs the destination MAC-VRF context to encapsulate traffic toward the correct L2 VNI. This requirement is one reason asymmetric routing scales less efficiently than symmetric routing: MAC-VRF presence and host reachability information must be broadly available. Symmetric routing improves scale by using an IP-VRF routed VXLAN interface and RT-5 prefix routes instead. Reference: asymmetric L3 EVPN routing, ingress IP/MAC forwarding, egress MAC forwarding, RT-2 versus RT-5 usage.
NEW QUESTION # 42
Which of the following statements about the configuration of a distributed Layer 2 EVPN in a Nokia SR Linux is FALSE?
Answer: C
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A distributed Layer 2 EVPN in SR Linux is implemented using MAC-VRF network instances, EVPN control-plane signaling, and VXLAN data-plane encapsulation. A common mistake is assuming that every PE must use the same EVI value for the same L2 service. In SR Linux, the important operational requirement is that the correct EVPN routes are imported and exported using matching route-target policy, not necessarily that every PE has the same locally configured EVI. Therefore, option A is false. The route distinguisher can be automatically generated using local values such as the autonomous system number and EVI, giving each PE's EVPN routes uniqueness in MP-BGP. A MAC-VRF is associated with VXLAN encapsulation for its data-plane service mapping, and route targets may need to be manually configured when leaf routers are in different autonomous systems because automatic derivation may not produce matching import/export policy across AS boundaries. The key separation is this: the RD gives uniqueness, the route target controls service membership, and the EVI is a local service identifier rather than a universal mandatory match in all designs. Reference: SR Linux distributed L2 EVPN configuration, EVI, RD auto-generation, route-target policy.
NEW QUESTION # 43
Which of the following statements about the gateway-less data center interconnect solution is FALSE?
Answer: A
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A gateway-less DCI design extends the data center EVPN/VXLAN model across the WAN without a distinct gateway function separating the data center fabric from the WAN VPN edge. Because the leaf routers or route reflectors must establish the necessary EVPN control-plane and VXLAN data-plane reachability across data centers, the WAN must provide reachability for those fabric endpoints. This design can simplify service continuity and preserve the EVPN overlay model end-to-end, but it does not provide the clean security and QoS demarcation that exists in a decoupled gateway model. A clear demarcation between a border leaf and a separate gateway/WAN PE is specifically a property of decoupled gateway-based DCI, not gateway-less DCI. The gateway-less model also requires reachability between route reflectors or EVPN control-plane endpoints across sites. Therefore, option A is false because it incorrectly assigns the demarcation benefit to the gateway-less design. Reference: gateway-less DCI, stretched EVPN overlay, route-reflector and leaf reachability requirements.
NEW QUESTION # 44
Consider the exhibit.
Which of the following statements about the proxy ARP entry for the neighbor IP 192.168.100.1 is FALSE?
Answer: C
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Proxy ARP in a Layer 2 EVPN service allows the leaf to answer ARP requests locally using learned IP/MAC bindings, reducing broadcast flooding across the overlay. SR Linux can also monitor IP duplication and MAC/IP inconsistencies in the proxy ARP table. A pending state indicates that the system has detected suspicious or conflicting information and is monitoring the binding before declaring it duplicate. If the entry becomes duplicate, SR Linux can use a blackhole behavior to prevent forwarding traffic toward a conflicted endpoint, and a special discard MAC such as 00:00:00:00:DE:AD can be associated with the duplicate entry. Option D is false because it incorrectly states that all traffic destined to 192.168.100.1 will be discarded for exactly 9 minutes. The exhibit references monitoring and hold-down behavior, but the answer key rejects the fixed "9 minutes" traffic-discard statement. The key concept is that duplicate handling protects the EVPN service from unstable or conflicting IP/MAC bindings, but the specific discard duration in option D is not correct. Reference: proxy ARP, IP duplication monitoring, duplicate-state blackhole behavior.
NEW QUESTION # 45
Which of the following statements about a BGP route target is FALSE?
Answer: A
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A BGP route target is an extended community used to control which EVPN routes are imported into which MAC-VRF or IP-VRF. It is carried with EVPN updates and acts as the import/export policy tag for tenant service membership. The statement that it is a BGP extended community is correct. It is also correct that route targets support multi-tenant operation, because they allow different EVPN instances to carry potentially overlapping MAC or IP information while importing only the routes intended for that service. However, option D is false in the wording used here. The route target does not itself identify the EVPN instance in the control plane as a unique route identifier. That role is more closely associated with the route distinguisher and EVPN NLRI construction, while the route target determines import eligibility. A route target tells a receiving PE whether the route belongs in a local service instance, but it is not the unique identity of the EVPN route. This distinction is critical: route distinguishers make routes unique; route targets control route distribution and service membership. Reference: EVPN route targets, BGP extended communities, route import/export policy, RD versus RT function.
NEW QUESTION # 46
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