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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 EVPN Services | 25% | - Anycast Gateway and IRB - Multi-homing and Ethernet Segments - EVPN Route Types 1โ4 |
| Topic 2: Data Center Interconnect (DCI) Solutions | 25% | - Gateway-less EVPN DCI - Interoperability with Nokia 7750 SR - BGP route policies and route reflectors |
| Topic 3: Layer 3 EVPN Services | 25% | - Symmetric and asymmetric routing - VRF integration and route targets - EVPN Route Type 5 |
| Topic 4: SR Linux and EVPN Fundamentals | 25% | - VXLAN encapsulation and underlay - EVPN control plane and MP-BGP - SR Linux architecture and CLI |
>> Real 4A0-D03 Exam Answers <<
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NEW QUESTION # 14
Consider the exhibit.
The network is going to be designed to use interface-less symmetric routing.
Which of the following statements is TRUE?
Answer: D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In interface-less symmetric routing, the EVPN fabric exchanges host forwarding information using EVPN route type 2 MAC/IP advertisements. RT-2 carries the host MAC address and, when present, the associated host IP address, allowing remote PEs to build the forwarding state needed for distributed gateway operation. Unlike asymmetric routing, interface-less symmetric routing does not require every MAC-VRF to be instantiated on every PE. The design scales better because each leaf only needs the locally attached MAC-VRFs plus the shared IP-VRF/routed VXLAN construct for inter-subnet forwarding. Option B describes an asymmetric forwarding pattern more than a symmetric one; in symmetric routing, both ingress and egress PEs perform routed forwarding functions through the IP-VRF. Option C is also incorrect because anycast gateway is fundamental when multiple leaves provide the same default-gateway service for a subnet. Therefore, the true statement is that forwarding information is exchanged using EVPN route type 2 updates. Reference: interface-less symmetric routing, EVPN RT-2 host MAC/IP signaling, distributed IRB operation.
NEW QUESTION # 15
Consider the exhibit.
All three of the leafs have a MP-BGP EVPN session to the route-reflector Spine-1. Leaf-1, Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Host-1 has just sent its first Ethernet frame into MAC VRF-1 on Leaf-1.
Which of the following steps 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]:
When Host-1 sends its first Ethernet frame into MAC VRF-1, Leaf-1 performs normal local data-plane MAC learning on the access interface and installs Host-1's MAC address into the MAC forwarding table. In an L2 EVPN MAC-VRF, host MAC reachability is then advertised into the EVPN control plane using EVPN route type 2, the MAC/IP Advertisement route. Route type 5 is not used for host MAC advertisement; RT-5 is used for IP prefix advertisement in Layer 3 EVPN services. Therefore, option B is false because it incorrectly states that Leaf-1 generates an EVPN RT-5 update with the host MAC address. In this topology, Leaf-1 sends the correct EVPN update to the route reflector, Spine-1. The route reflector then reflects the update to Leaf-2 and Leaf-3, and those remote leaves import the route if the route target matches their MAC VRF-1 import policy. The route target controls service membership, ensuring that only PEs participating in the same EVPN instance import the MAC route. Reference: L2 EVPN MAC learning, RT-2 MAC/IP advertisement, route-reflector distribution, route-target import.
NEW QUESTION # 16
Consider the exhibit.
All three leafs have an EVPN MP-BGP session with the route reflector in Spine-1. Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Leaf-1 has just enabled a new instance of MAC VRF-1.
Which of the following steps is NOT taken when this new instance is enabled?
Answer: B
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
When a new Layer 2 EVPN MAC-VRF instance is enabled, the PE advertises an Inclusive Multicast Ethernet Tag route, commonly called an IMET route or EVPN route type 3. The IMET route is used to auto-discover remote PEs that participate in the same EVPN service and to build the BUM flooding list for that MAC-VRF. In this topology, all leaf routers peer with the route reflector on Spine-1. Leaf-1 therefore advertises its IMET route to the route reflector, not directly to Leaf-2 and Leaf-3. The route reflector then reflects the EVPN update to the other client leaves. Leaf-2 and Leaf-3 import the route based on matching route-target policy and add Leaf-1 to the replication list for broadcast, unknown unicast, and multicast traffic. Option B is the step that is not taken because it incorrectly describes direct leaf-to-leaf EVPN advertisement. In a route-reflector design, the RR centralizes EVPN route distribution and avoids the need for a full mesh of MP-BGP EVPN sessions between leaves. Reference: EVPN RT-3 IMET route, route-reflector operation, BUM flooding-list auto-discovery.
NEW QUESTION # 17
Consider the exhibit.
The two MAC-VRFs are inter-connected using IP-VRF3 which is to be deployed using asymmetric routing.
Which of the following statements is FALSE?
Answer: B
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, each participating PE must have the MAC-VRFs needed to forward traffic in the destination bridge domain. However, the specific exhibit describes two MAC-VRFs interconnected through IP-VRF3, with Leaf-1 hosting MAC-VRF1 and Leaf-2 hosting MAC-VRF2. The false statement is that Leaf-1 and Leaf-2 must both have instances of MAC-VRF1 and MAC-VRF2. That requirement is not true for this described deployment. Each local MAC-VRF connects to IP-VRF3 using an IRB interface, and host MAC/IP information is advertised using EVPN route type 2 so remote PEs can learn endpoint reachability. The question's answer also implies that IP prefix advertisement using route type 5 is part of the control-plane exchange between the leaves for the routed service context. What matters is that the fabric can resolve host and prefix reachability through EVPN without forcing every PE to instantiate every MAC-VRF in this topology. Option B overstates the MAC-VRF placement requirement and is therefore false. Reference: asymmetric L3 EVPN routing, RT-2 host advertisements, RT-5 IP prefix routes, IRB attachment.
NEW QUESTION # 18
Consider the exhibit.
dcgw10 is a Nokia 7750SR and is used as the integrated gateway.
Which of the following is NOT configured in VPLS 100 on dcgw10?
Answer: B
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
For Layer 2 data center interconnect using an integrated gateway, VPLS 100 on the Nokia 7750 SR represents the WAN-side Layer 2 VPN service. The VPLS requires an EVI because EVPN uses the EVI to identify the L2 service instance in the control plane. It also requires BGP EVPN signaling with the appropriate route targets so the local and remote service instances can import the correct EVPN routes. Because the service is transported across the WAN, the BGP/EVPN instance must be associated with the MPLS transport tunnels toward the remote gateway, dcgw20. A VXLAN instance with a VNI is not configured in the 7750 SR VPLS 100 for this integrated WAN gateway service. The VXLAN/VNI mapping is used inside the SR Linux data center fabric where MAC-VRF services are transported over VXLAN. On the WAN side, the VPLS service is carried using MPLS/EVPN mechanisms, not a VXLAN VNI configured directly under the VPLS. Reference: integrated gateway DCI, L2 EVPN/VPLS interworking, EVI and route-target operation.
NEW QUESTION # 19
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