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| Section | Objectives |
|---|---|
| Operations, Troubleshooting and Best Practices | - Monitoring SR Linux and EVPN environments - Network optimization and scaling considerations - Troubleshooting BGP EVPN and VXLAN issues |
| Data Center Interconnect (DCI) | - EVPN-based interconnect solutions - Redundancy and high availability strategies - L2 and L3 DCI design patterns |
| EVPN and VXLAN Data Center Fabric | - EVPN control plane fundamentals - EVPN route types and MAC/IP advertisement - VXLAN data plane and encapsulation |
| BGP and Routing in Data Center Environments | - BGP EVPN address families - Route reflection and scaling design - Interoperability between routing domains |
| SR Linux Architecture and Fundamentals | - SR Linux system architecture and components - Network operating system concepts and containerized routing functions - Configuration and operational models |
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NEW QUESTION # 13
When configuring the EVPN MP-BGP route reflector sessions between the leaf and spine routers, 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 SR Linux BGP configuration, parameters defined at a more specific hierarchy level can override broader protocol-level settings. Therefore, if a `local-as` value is configured within the BGP group used for EVPN MP-BGP route-reflector sessions, that value overrides the AS number configured directly under the BGP protocol for that group's sessions. Option A is correct. Option B is false because the cluster ID is configured on the route reflector, not on every participating client. The cluster ID identifies the RR cluster and helps prevent route-reflection loops. Option C is false because redundant route reflectors normally operate in parallel rather than as strict primary/backup devices; clients can peer with both for resilience. Option D is misleading because EVPN route reflectors are used to avoid a full mesh of overlay MP-BGP EVPN sessions between leaves, not to replace ordinary underlay eBGP leaf-spine routing sessions. In a clean fabric design, the underlay provides IP reachability, while the EVPN overlay uses MP-BGP sessions, often via route reflectors, to distribute tenant reachability. Reference: SR Linux BGP hierarchy, EVPN route reflector sessions, local-AS override, cluster ID behavior.
NEW QUESTION # 14
Which of the following EVPN route-types is used to implement aliasing?
Answer: B
NEW QUESTION # 15
Leaf routers are configured to support Layer 2 multi-homing all-active mode.
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 all-active Layer 2 EVPN multi-homing, the host is typically dual-homed to two or more leaf routers using a LAG. The participating leaf routers must configure the LAG and associate it with the Ethernet Segment so EVPN can advertise the common ESI and apply aliasing, split-horizon, and DF procedures. If VLAN tagging is used for service separation, tagging must be configured on the LAG interface so that the correct subinterfaces can bind into the MAC-VRF and Ethernet Segment. Option C is false because it states that the LACP system-id-mac must uniquely identify each leaf router. In an all-active EVPN multihomed LAG, the opposite principle applies: from the host's LACP perspective, the multihomed leaf pair must appear as a single logical LACP system. That generally requires a shared LACP system ID or coordinated system MAC behavior across the participating PEs. If each leaf presented a unique LACP system identity, the host would treat them as separate LAG partners and the all-active bundle would not form correctly. Reference: all-active L2 EVPN multi-homing, LAG attachment, LACP system ID behavior, Ethernet Segment association.
NEW QUESTION # 16
Consider the exhibit.
Host-2 is sending data to Host-1. The network is designed to use asymmetric routing.
Which of the following statements about the operation of the data plane 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 asymmetric EVPN IRB, the ingress PE performs routing from the source subnet into the destination subnet, then forwards the packet across the VXLAN overlay using the destination MAC-VRF/VNI. The egress PE does not perform another IP-VRF lookup for that packet; it performs Layer 2 forwarding in the destination MAC-VRF. In this scenario, Host-2 sends traffic toward Host-1. After the ingress routing decision, the traffic arrives at Leaf-2 in the context of the destination MAC-VRF, mac-vrf-1. Leaf-2 then performs a MAC lookup in mac-vrf-1 and forwards the frame to Host-1. Option D is therefore correct. Option A reverses the forwarding direction and misidentifies the leaf action. Option B incorrectly sends mac-vrf-2 traffic toward the IP-VRF on Leaf-2, even though Leaf-2 is acting as the egress PE for Host-1. Option C is also incorrect because the egress forwarding action is based on the MAC table in the destination MAC-VRF, not an IP-VRF ARP lookup at that stage. Reference: asymmetric L3 EVPN IRB data-plane operation, ingress routing and egress MAC forwarding.
NEW QUESTION # 17
Which of the following statements about a L3 EVPN network using symmetric routing 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]:
Symmetric L3 EVPN routing uses an IP-VRF-based overlay model in which both ingress and egress PEs participate in routed forwarding. The ingress PE receives the frame from the local MAC-VRF, routes it into the IP-VRF, and sends it across the VXLAN routed interface. The egress PE receives the routed overlay packet, performs the corresponding IP-VRF lookup, and then forwards it into the locally attached destination MAC-VRF. Because the routed overlay is built per IP-VRF, a routed-VXLAN interface is required for that IP-VRF. EVPN route type 5 support is also required because RT-5 carries IP prefix reachability across the EVPN control plane. The false statement is option D. Symmetric routing specifically removes the requirement for every MAC-VRF to exist on every PE. A PE only needs the MAC-VRFs for locally attached subnets, plus the shared IP-VRF and routed overlay state. This is the major scaling advantage of symmetric routing compared with designs that require broad MAC-VRF instantiation across the fabric. Reference: symmetric L3 EVPN routing, routed VXLAN interface, RT-5 prefix reachability, MAC-VRF scaling.
NEW QUESTION # 18
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