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| Section | Objectives |
|---|---|
| Operations, Troubleshooting and Best Practices | - Network optimization and scaling considerations - Troubleshooting BGP EVPN and VXLAN issues - Monitoring SR Linux and EVPN environments |
| Data Center Interconnect (DCI) | - Redundancy and high availability strategies - L2 and L3 DCI design patterns - EVPN-based interconnect solutions |
| SR Linux Architecture and Fundamentals | - Configuration and operational models - Network operating system concepts and containerized routing functions - SR Linux system architecture and components |
| BGP and Routing in Data Center Environments | - Interoperability between routing domains - BGP EVPN address families - Route reflection and scaling design |
| EVPN and VXLAN Data Center Fabric | - VXLAN data plane and encapsulation - EVPN control plane fundamentals - EVPN route types and MAC/IP advertisement |
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NEW QUESTION # 26
Which of the following statements about configuring and using an integrated routing and bridging (IRB) interface is TRUE?
Answer: C
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
An IRB interface is the logical connection point between a Layer 2 MAC-VRF and a Layer 3 IP-VRF. It provides the routed gateway function for hosts in the bridge domain while allowing traffic to move into the routed VRF for inter-subnet forwarding. The correct statement is that when an IRB sub-interface has multiple IP addresses, one can be designated as the primary. This is important because the primary address is used for normal gateway or subnet behavior when more than one address is present on the same routed interface context. Option A is inaccurate because the question is about an IRB sub-interface, not a generic subinterface selection between bridge or routed access modes. Option B is not the defining multi-homing model; EVPN multi-homing is implemented through Ethernet Segment association and MAC-VRF attachment behavior, not by adding multiple IRB subinterfaces for multi-homing. Option D is also wrong because the IRB is the shared logical link between the MAC-VRF and IP-VRF; the design does not require separate IRB subinterfaces on each side as independent constructs. Reference: SR Linux IRB configuration, MAC-VRF to IP-VRF interconnection, primary IP addressing.
NEW QUESTION # 27
e-BGP is used as the routing protocol in the data center underlay.
When configuring the EVPN MP-BGP route reflector sessions, which of the following statements 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 many SR Linux data center fabrics, eBGP is used in the underlay because it gives simple hop-by-hop routing, fast convergence, and clean autonomous-system separation between leaf and spine nodes. The EVPN overlay, however, is a separate MP-BGP control plane used to distribute EVPN NLRI. The overlay route-reflector session does not have to reuse the leaf's underlay autonomous system number. In practice, an overlay BGP group may use a distinct local AS or configuration model separate from the underlay AS design. Therefore, option B is false. The route reflector's cluster ID is configured on the route reflector itself to prevent reflection loops and identify the RR cluster. Redundant route reflectors can be deployed for resiliency, and clients may receive duplicate paths or duplicate updates from multiple RRs; the BGP decision process and route reflection rules handle this. The key design distinction is that underlay eBGP provides IP reachability between loopbacks, while overlay MP-BGP EVPN carries tenant service reachability. Mixing these roles leads to incorrect AS planning. Reference: SR Linux EVPN MP-BGP route reflectors, eBGP underlay, overlay BGP sessions.
NEW QUESTION # 28
Consider the exhibit.
The network is going to be designed to use interface-less symmetric routing.
Which of the following statements is TRUE?
Answer: A
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 # 29
When PEs are connected to an Ethernet segment with at least one active MAC-VRF, which of the following statements about the AD per EVI updates sent by a PE is FALSE?
Answer: D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Ethernet Auto-Discovery per EVI information is used in EVPN multi-homing to advertise that a PE has reachability to a particular Ethernet Segment for a specific EVPN instance. Remote PEs use this information for aliasing, allowing them to forward known unicast traffic toward a multi-homed Ethernet Segment through eligible PEs rather than relying only on the PE that advertised a specific MAC route. In VXLAN-based EVPN, the update also carries information needed by remote peers to select the proper data-plane encapsulation and VNI for the service. The multi-homing behavior advertised with the Ethernet Segment enables remote peers to understand whether the attachment is operating in all-active or single-active mode. Option D is the false statement in this context because route-target handling is a general BGP EVPN import/export mechanism associated with VPN route policy and extended communities; it is not the specific operational function that defines AD per EVI behavior. The AD per EVI route's purpose is Ethernet Segment reachability for an EVI, not route-target-based service identification by itself. Reference: EVPN route type 1, AD per EVI, aliasing and multi-homing signaling.
NEW QUESTION # 30
Which of the following statements about the gateway-less data center interconnect solution is FALSE?
Answer: D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In a gateway-less DCI design, there is no dedicated gateway device performing EVPN-to-WAN service interworking. Instead, the data center EVPN overlay is extended across the WAN more directly. Because leaf routers must establish overlay reachability across sites, the IP addresses of the leaf VTEPs need to be reachable through the WAN, commonly by redistributing or otherwise carrying the necessary loopback reachability. The WAN transparently carries the EVPN/VXLAN overlay, and leaf routers can establish VXLAN tunnels across the WAN to remote leaves. Option D is false because it introduces "data center gateway routers" maintaining MP-BGP EVPN peering with the data center route reflector. That is not the gateway-less model; it describes a gateway-based role that does not exist as a separate function in this architecture. In gateway-less DCI, the EVPN control-plane and VXLAN data-plane extension are handled by the fabric endpoints themselves, so the design trades demarcation and interworking control for a more direct overlay extension model. Reference: gateway-less DCI, WAN reachability for leaf VTEPs, transparent EVPN overlay carriage, VXLAN tunnel extension.
NEW QUESTION # 31
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