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| Section | Objectives |
|---|---|
| BGP EVPN Control Plane Operations | - Route distribution and policies
|
| Data Center Interconnect (DCI) | - Resiliency and convergence
|
| EVPN Fundamentals | - EVPN architecture and control plane
|
| SR Linux Data Center Architecture | - Fabric design principles
|
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NEW QUESTION # 57
Consider the exhibit.
All connected leaf routers have the same Ethernet segment configuration. The IP-VRF is configured properly and is operational.
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]:
The exhibit describes a Layer 3 multi-homing scenario where the Ethernet Segment is associated with an IP-VRF and the configuration references an EVI value of 1000. The segment is configured with all-active multi-homing, allowing multiple attached leaf routers to advertise reachability for the same external L3 next-hop or third-party prefix attachment. In this model, the Ethernet Segment represents the shared L3 attachment and is used by EVPN to associate remote prefix reachability with the multi-homed segment. The incorrect statement is that a LAG must be configured on the connected leaf routers and the host. That requirement is specific to many Layer 2 all-active host attachment designs, where the host commonly uses LACP toward multiple leaf routers and the leaf LAG subinterfaces are associated with the Ethernet Segment. In Layer 3 multi-homing, the attached device can be a router or VNF, and the EVPN ES association can be used for L3 prefix reachability without mandating that the host side be configured as a LAG. Reference: L3 EVPN multi-homing, EVI association, all-active Ethernet Segment behavior.
NEW QUESTION # 58
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: B
NEW QUESTION # 59
Which of the following statements about a distributed Layer 2 EVPN 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 distributed Layer 2 EVPN service, the local leaf learns host reachability from frames received on access interfaces. When a host replies to an ARP request, the local leaf can learn the source MAC address from the Ethernet frame and install it in the MAC forwarding table. If the ARP payload contains an IP/MAC binding, the PE can also use that information for proxy ARP and EVPN MAC/IP advertisement. The local PE then advertises the learned endpoint reachability using EVPN route type 2 to its BGP EVPN peers or route reflector. The false statement is B. The ARP reply is not replicated to every leaf in the flooding list as a normal operation. EVPN's purpose is to reduce unnecessary flooding by distributing endpoint reachability through the control plane. BUM replication is used for broadcast, unknown unicast, and multicast traffic when needed, but a learned ARP reply does not require blind replication to all remote leaves. Instead, the leaf advertises the learned MAC/IP state through MP-BGP EVPN, allowing remote PEs to install accurate forwarding and proxy ARP state. Reference: distributed L2 EVPN operation, ARP learning, EVPN RT-2 advertisement.
NEW QUESTION # 60
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 # 61
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: D
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 # 62
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