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| Section | Objectives |
|---|---|
| Topic 1: Operations, Troubleshooting and Best Practices | - Troubleshooting BGP EVPN and VXLAN issues - Network optimization and scaling considerations - Monitoring SR Linux and EVPN environments |
| Topic 2: SR Linux Architecture and Fundamentals | - SR Linux system architecture and components - Network operating system concepts and containerized routing functions - Configuration and operational models |
| Topic 3: Data Center Interconnect (DCI) | - EVPN-based interconnect solutions - Redundancy and high availability strategies - L2 and L3 DCI design patterns |
| Topic 4: EVPN and VXLAN Data Center Fabric | - EVPN control plane fundamentals - EVPN route types and MAC/IP advertisement - VXLAN data plane and encapsulation |
| Topic 5: BGP and Routing in Data Center Environments | - Route reflection and scaling design - Interoperability between routing domains - BGP EVPN address families |
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NEW QUESTION # 20
Which of the following statements about utilizing VXLAN for the data plane in the data center 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]:
VXLAN provides a Layer 2 overlay over a Layer 3 underlay by encapsulating Ethernet frames in UDP/IP. This allows tenant bridge domains to span a routed IP fabric without requiring the underlay itself to behave like one large Layer 2 network. VXLAN uses a 24-bit VXLAN Network Identifier, which supports approximately 16 million logical overlays, far exceeding the scale of traditional 12-bit VLAN IDs. Because the VXLAN underlay is IP-routed, traffic can benefit from ECMP across equal-cost paths, improving fabric utilization and resiliency. The false statement is B. VXLAN was not originally developed specifically to support EVPN. VXLAN began as a data-plane overlay encapsulation technology, while EVPN later became the preferred control plane for distributing MAC, MAC/IP, multicast, and prefix reachability in VXLAN-based fabrics. In modern data center design, EVPN and VXLAN are commonly paired: VXLAN supplies the encapsulation and VNI-based segmentation, while EVPN supplies scalable control-plane learning and signaling. Reference: VXLAN data plane, EVPN control plane, ECMP underlay, VNI-based tenant isolation.
NEW QUESTION # 21
Consider the exhibit.
Which of the following is NOT configured on dcgw10 to support the Layer 3 VPN connectivity?
Answer: B
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In an integrated gateway-based data center interconnect design, the gateway must interwork between the data center EVPN/VXLAN domain and the WAN VPN transport domain. For Layer 3 VPN connectivity on a Nokia 7750 SR integrated gateway, the base BGP instance must support the relevant VPN address families, such as VPN-IPv4 and EVPN, because the gateway participates in control-plane exchange between the data center and WAN sides. The VPRN must also be associated with the WAN transport, normally through MPLS tunnel binding, and the VRF target must match the corresponding VPRN on the remote gateway so that VPN routes are imported and exported correctly. A routed VXLAN interface, however, is an SR Linux IP-VRF/VXLAN construct used for symmetric L3 EVPN forwarding inside a VXLAN-based data center fabric. In this question, dcgw10 is acting as the integrated WAN gateway for L3VPN connectivity, so a routed VXLAN interface is not the required configuration item on the VPRN instance. Reference: integrated gateway DCI, VPRN over MPLS, EVPN-to-VPN interworking.
NEW QUESTION # 22
Which of the following statements about the Layer 2 EVPN configuration/operation 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]:
In SR Linux, a Layer 2 EVPN service is implemented using a MAC-VRF network instance. The MAC-VRF represents the tenant bridge domain and is associated with access subinterfaces and a VXLAN data-plane mapping. Local hosts are learned through the data plane when Ethernet frames arrive on local interfaces. Remote hosts, however, are not learned by flooding or by configuring static per-peer VXLAN interfaces. They are learned through MP-BGP EVPN updates, especially EVPN route type 2 MAC/IP Advertisement routes. Option B is false because SR Linux does not require a separate manually configured VXLAN interface toward each remote VTEP for the MAC-VRF. Instead, the MAC-VRF is bound to VXLAN encapsulation and a VNI, while remote VTEPs and their MAC reachability are discovered dynamically through the EVPN control plane. This is one of the central advantages of EVPN compared with static VXLAN flood-and-learn models: the overlay endpoints and endpoint reachability are signaled through BGP, reducing manual configuration and improving scale. Reference: SR Linux L2 EVPN MAC-VRF configuration, MP-BGP EVPN learning, VXLAN data-plane mapping.
NEW QUESTION # 23
A host is connected to multiple PEs through multi-homing.
Which of the following is NOT a function of the EVPN route-type 4 route?
Answer: A
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
EVPN route type 4 is the Ethernet Segment route. Its core role is to advertise Ethernet Segment membership so that PEs attached to the same multi-homed segment can discover each other. This discovery is essential for multi-homing procedures such as DF election, split-horizon behavior, and redundancy handling. When multiple PEs advertise the same ESI, the EVPN control plane can build the candidate set of PEs that participate in that Ethernet Segment. This enables DF election for BUM forwarding and supports the correct interpretation of the segment's redundancy model. The incorrect statement is option C. The election algorithm itself is not the basic function of the route type 4 advertisement in the way the question frames it. The route type is primarily about Ethernet Segment discovery and participation; the algorithmic decision process is derived from configured DF election behavior and candidate information, not from route type 4 acting as a generic algorithm identifier. Therefore, route type 4 enables DF procedures, but it is not described as the mechanism that identifies the election algorithm type. Reference: EVPN RT-4 Ethernet Segment route, DF election, multi-homing discovery.
NEW QUESTION # 24
Consider the exhibit.
The network is going to be designed to use interface-less symmetric routing.
Which of the following statements is TRUE?
Answer: B
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 # 25
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