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| Section | Objectives |
|---|---|
| Operations, Troubleshooting and Best Practices | - Troubleshooting BGP EVPN and VXLAN issues - Monitoring SR Linux and EVPN environments - Network optimization and scaling considerations |
| Data Center Interconnect (DCI) | - Redundancy and high availability strategies - L2 and L3 DCI design patterns - EVPN-based interconnect solutions |
| 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 |
| SR Linux Architecture and Fundamentals | - Network operating system concepts and containerized routing functions - Configuration and operational models - SR Linux system architecture and components |
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NEW QUESTION # 15
A host is connected to a MAC-VRF on leaf1 and leaf2. The MAC-VRF interfaces on leaf1 and leaf2 are associated to an Ethernet segment configured for active-standby multi-homing.
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 active-standby, or single-active, Layer 2 EVPN multi-homing, only one PE is active for the Ethernet Segment and MAC-VRF at a time. Leaf1 and Leaf2 participate in DF election, and the elected DF becomes the active forwarding PE for that service attachment. Because this is not all-active multi-homing, the non-DF must not forward traffic to the host for the protected service. This prevents duplicate frames, incorrect MAC learning, and loops on the access side. The DF accepts traffic from the host and forwards BUM traffic received from remote PEs toward the host-facing segment. Option D is false because it claims that the non-DF can forward unicast traffic from remote PEs to the host. In single-active operation, remote peers must direct traffic to the active PE, and the standby PE remains ready to take over only after DF state changes. This is the operational distinction from all-active multi-homing, where more than one PE may be used for forwarding depending on the traffic type and aliasing behavior. Reference: single-active L2 EVPN multi-homing, DF role, non-DF forwarding suppression.
NEW QUESTION # 16
Which of the following statements about the decoupled gateway-based data center interconnect solution 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]:
A decoupled gateway-based DCI model separates the data center border-leaf function from the WAN PE function. This separation is the key design point. The border leaf remains part of the data center EVPN/VXLAN environment, while the WAN PE participates in WAN VPN transport and policy enforcement. Because the roles are split across two devices, the handoff between the border leaf and WAN PE provides a clean administrative and operational boundary. That boundary is useful for security policy, QoS marking, traffic classification, and troubleshooting ownership. The WAN does not need direct reachability to every leaf and route reflector as in a gateway-less model. The WAN PE also does not peer directly with the data center route reflector in a decoupled model; route exchange occurs through the border-leaf/WAN-PE handoff. VXLAN tunnels between leaf routers across different data centers are characteristic of gateway-less extension, not decoupled gateway operation. Therefore, the statement about clear demarcation between the data center border leaf and WAN PE is the accurate description. Reference: decoupled gateway-based DCI, security/QoS demarcation, WAN PE separation.
NEW QUESTION # 17
Leaf routers are configured to support Layer 2 multi-homing all-active mode.
Which of the following statements 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]:
For Layer 2 all-active EVPN multi-homing on SR Linux, the Ethernet Segment configuration is the control-plane anchor that binds the redundant access attachment to EVPN. The relevant LAG subinterfaces must be associated with the Ethernet Segment so that the PE can advertise the segment correctly and apply split-horizon and aliasing behavior. The Ethernet Segment must also be administratively enabled; otherwise, the PE will not participate properly in ES discovery and DF procedures. The multi-homing mode must be set to all-active to permit forwarding through multiple attached leaf routers and support host-side LAG operation. The false statement is option B. The Ethernet Segment Identifier has a defined structure, and the blanket statement that the 2nd through 7th octets "must not be all zeros" is not a valid requirement as stated. What matters operationally is that the ESI uniquely identifies the same multi-homed Ethernet Segment across participating PEs and is consistently configured where required. The ESI must be non-zero as a meaningful segment identifier, but the specific octet restriction in the option is not the SR Linux all-active configuration rule. Reference: SR Linux L2 EVPN all-active multi-homing, Ethernet Segment configuration, LAG association.
NEW QUESTION # 18
Consider the exhibit.
Which of the following statements about the configuration and operation of this setup 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]:
This scenario describes all-active Layer 2 EVPN multi-homing with a host connected through a LAG to Leaf1 and Leaf2. The LAG subinterface is associated with the MAC-VRF on both participating leaves, and the Ethernet Segment ES-1 is configured for all-active multi-homing. In all-active operation, both leaf routers can be active attachment points for host-originated traffic, and remote traffic can use EVPN multi-homing mechanisms to reach the segment. Option D is false because the host does not know or use the EVPN Designated Forwarder state when sending BUM traffic. The host forwards over its LAG based on its local LAG hashing and LACP behavior. DF election is an EVPN PE-side mechanism used mainly to control which PE forwards BUM traffic from the EVPN overlay toward the Ethernet Segment, preventing duplicate delivery to the multihomed access network. The host itself does not selectively forward all BUM traffic toward the DF. That distinction is critical: DF controls overlay-to-segment replication, while the host's LAG controls host-to-leaf link selection. Reference: all-active L2 EVPN multi-homing, host LAG behavior, DF election scope, BUM forwarding.
NEW QUESTION # 19
Consider the exhibit.
Which of the following statements about the proxy ARP entry for the neighbor IP 192.168.100.1 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]:
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 # 20
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