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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 EVPN Services | 25% | - EVPN Route Types 1โ4 - Multi-homing and Ethernet Segments - Anycast Gateway and IRB |
| Topic 2: Data Center Interconnect (DCI) Solutions | 25% | - Interoperability with Nokia 7750 SR - BGP route policies and route reflectors - Gateway-less EVPN DCI |
| Topic 3: Layer 3 EVPN Services | 25% | - Symmetric and asymmetric routing - VRF integration and route targets - EVPN Route Type 5 |
| Topic 4: SR Linux and EVPN Fundamentals | 25% | - VXLAN encapsulation and underlay - SR Linux architecture and CLI - EVPN control plane and MP-BGP |
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NEW QUESTION # 10
Which of the following statements about a distributed Layer 2 EVPN 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 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 # 11
Which of the following statements about the configuration of a distributed Layer 2 EVPN in a Nokia SR Linux 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]:
A distributed Layer 2 EVPN in SR Linux is implemented using MAC-VRF network instances, EVPN control-plane signaling, and VXLAN data-plane encapsulation. A common mistake is assuming that every PE must use the same EVI value for the same L2 service. In SR Linux, the important operational requirement is that the correct EVPN routes are imported and exported using matching route-target policy, not necessarily that every PE has the same locally configured EVI. Therefore, option A is false. The route distinguisher can be automatically generated using local values such as the autonomous system number and EVI, giving each PE's EVPN routes uniqueness in MP-BGP. A MAC-VRF is associated with VXLAN encapsulation for its data-plane service mapping, and route targets may need to be manually configured when leaf routers are in different autonomous systems because automatic derivation may not produce matching import/export policy across AS boundaries. The key separation is this: the RD gives uniqueness, the route target controls service membership, and the EVI is a local service identifier rather than a universal mandatory match in all designs. Reference: SR Linux distributed L2 EVPN configuration, EVI, RD auto-generation, route-target policy.
NEW QUESTION # 12
Consider the exhibit.
All three of the leafs have a MP-BGP EVPN session to the route-reflector Spine-1. Leaf-1, Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Host-1 has just sent its first Ethernet frame into MAC VRF-1 on Leaf-1.
Which of the following steps 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]:
When Host-1 sends its first Ethernet frame into MAC VRF-1, Leaf-1 performs normal local data-plane MAC learning on the access interface and installs Host-1's MAC address into the MAC forwarding table. In an L2 EVPN MAC-VRF, host MAC reachability is then advertised into the EVPN control plane using EVPN route type 2, the MAC/IP Advertisement route. Route type 5 is not used for host MAC advertisement; RT-5 is used for IP prefix advertisement in Layer 3 EVPN services. Therefore, option B is false because it incorrectly states that Leaf-1 generates an EVPN RT-5 update with the host MAC address. In this topology, Leaf-1 sends the correct EVPN update to the route reflector, Spine-1. The route reflector then reflects the update to Leaf-2 and Leaf-3, and those remote leaves import the route if the route target matches their MAC VRF-1 import policy. The route target controls service membership, ensuring that only PEs participating in the same EVPN instance import the MAC route. Reference: L2 EVPN MAC learning, RT-2 MAC/IP advertisement, route-reflector distribution, route-target import.
NEW QUESTION # 13
Which EVPN route-type (RT) is used in multi-homing scenarios to support aliasing and fast convergence?
Answer: B
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
The EVPN route type used for aliasing and fast convergence in multi-homing is RT-1, the Ethernet Auto-Discovery route. RT-1 has two important forms: Ethernet A-D per Ethernet Segment and Ethernet A-D per EVI. These routes advertise reachability to a multi-homed Ethernet Segment and to a specific EVPN instance on that segment. Remote PEs use this information for aliasing, meaning they can forward traffic toward any eligible PE attached to the same Ethernet Segment, even when a specific MAC was advertised by only one PE. RT-1 also supports fast convergence because withdrawal of Ethernet A-D routes quickly informs remote PEs that an attachment path or PE is no longer valid, avoiding slow MAC aging as the primary failure-detection mechanism. RT-4 Ethernet Segment routes are related to multi-homing, but their main function is Ethernet Segment discovery and Designated Forwarder election. RT-2 advertises host MAC/IP reachability, and RT-3 builds multicast/BUM replication lists. Therefore, RT-1 is the precise answer for aliasing and fast convergence. Reference: EVPN multi-homing route types, Ethernet Auto-Discovery, aliasing and convergence behavior.
NEW QUESTION # 14
Consider the exhibit.
Based upon the information in the screen captures, 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]:
The exhibit describes an EVPN IRB environment where MAC-VRF100 and IP-VRF-100 exchange host reachability through local learning and EVPN advertisements. Leaf-1 can advertise EVPN route type 2 updates containing host MAC/IP information for MAC-VRF100. This is the normal mechanism used to distribute endpoint bindings learned from local hosts. If IP-VRF-100 is not configured for prefix advertisement, Leaf-1 will not generate EVPN route type 5 updates for that IP-VRF, so option A is consistent. The ARP cache in the IP-VRF is normally required for local subnet host resolution; remote host reachability can be learned through EVPN rather than requiring every remote ARP entry to be learned by local data-plane ARP. Option B is false because ARP/GARP snooping is not performed by the IRB interface in the manner stated. ARP/GARP learning for proxy ARP and MAC/IP advertisement is associated with the MAC-VRF bridge-domain behavior and the local access side, not with the IRB subinterface indiscriminately snooping all ARP/GARP messages as described. Reference: EVPN IRB operation, RT-2 host MAC/IP advertisement, RT-5 behavior, ARP/GARP learning scope.
NEW QUESTION # 15
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