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| Section | Weight | Objectives |
|---|---|---|
| Layer 3 EVPN Services | 25% | - VRF integration and route targets - Symmetric and asymmetric routing - EVPN Route Type 5 |
| Data Center Interconnect (DCI) Solutions | 25% | - Gateway-less EVPN DCI - BGP route policies and route reflectors - Interoperability with Nokia 7750 SR |
| SR Linux and EVPN Fundamentals | 25% | - SR Linux architecture and CLI - EVPN control plane and MP-BGP - VXLAN encapsulation and underlay |
| Layer 2 EVPN Services | 25% | - EVPN Route Types 1โ4 - Anycast Gateway and IRB - Multi-homing and Ethernet Segments |
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NEW QUESTION # 26
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: C
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 # 27
Which of the following statements about utilizing asymmetric routing in an L3 EVPN network 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]:
Asymmetric routing relies heavily on host MAC/IP information because the ingress PE performs routing into the destination subnet and then sends the frame across the overlay using the destination MAC-VRF/VNI. This means PEs require enough ARP and MAC/IP binding information to forward traffic toward remote hosts correctly. If a host has multiple IP addresses on the same interface, separate EVPN route type 2 advertisements may be needed to communicate each IP-to-MAC binding. The ingress and egress PEs participate in MAC and IP forwarding across the end-to-end service path, but the forwarding responsibilities differ by direction and stage. The false statement is option C. The statement says all MAC-VRFs connected to the L3 EVPN network must exist on each PE, but that is not the correct requirement in this question's verified answer set. In practical EVPN designs, the exact MAC-VRF placement depends on whether the service is implemented as asymmetric, symmetric, interface-less, or interface-ful routing. Here, the course answer marks the universal MAC-VRF requirement as false. Reference: asymmetric L3 EVPN routing, RT-2 MAC/IP advertisements, ARP and MAC forwarding behavior.
NEW QUESTION # 28
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: A
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 # 29
Consider the exhibit.
The two MAC-VRFs are inter-connected using IP-VRF3 which is to be deployed using asymmetric routing.
Which of the following statements 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]:
In asymmetric L3 EVPN routing, each participating PE must have the MAC-VRFs needed to forward traffic in the destination bridge domain. However, the specific exhibit describes two MAC-VRFs interconnected through IP-VRF3, with Leaf-1 hosting MAC-VRF1 and Leaf-2 hosting MAC-VRF2. The false statement is that Leaf-1 and Leaf-2 must both have instances of MAC-VRF1 and MAC-VRF2. That requirement is not true for this described deployment. Each local MAC-VRF connects to IP-VRF3 using an IRB interface, and host MAC/IP information is advertised using EVPN route type 2 so remote PEs can learn endpoint reachability. The question's answer also implies that IP prefix advertisement using route type 5 is part of the control-plane exchange between the leaves for the routed service context. What matters is that the fabric can resolve host and prefix reachability through EVPN without forcing every PE to instantiate every MAC-VRF in this topology. Option B overstates the MAC-VRF placement requirement and is therefore false. Reference: asymmetric L3 EVPN routing, RT-2 host advertisements, RT-5 IP prefix routes, IRB attachment.
NEW QUESTION # 30
Which of the following statements about an integrated routing and bridging (IRB) interface 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]:
An IRB interface provides the logical L3 gateway function between a Layer 2 MAC-VRF and a Layer 3 IP-VRF on the same PE. It allows locally bridged hosts to route into the tenant IP-VRF while preserving EVPN control-plane signaling for MAC/IP reachability. The IRB subinterface must have at least one IP address because it acts as the routed gateway for the subnet, and it may also be configured with ACLs to apply traffic policy at the L3 boundary. Option B is false because it incorrectly generalizes the IRB relationship. In SR Linux EVPN service modeling, an IRB subinterface connects a MAC-VRF to an IP-VRF in a controlled one-to-one service attachment context; the design is not that both IP-VRFs and MAC-VRFs arbitrarily contain multiple IRB interfaces for the same relationship. A MAC-VRF has its IRB gateway association into the IP-VRF, and the IP-VRF may connect to multiple MAC-VRFs through distinct IRB contexts, but the statement as written is not the correct rule for IRB interface behavior. Reference: SR Linux IRB interface operation, MAC-VRF/IP-VRF interconnection, gateway IP and ACL support.
NEW QUESTION # 31
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