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| Section | Objectives |
|---|---|
| Topic 1: Data Center Interconnect (DCI) | - Redundancy and high availability strategies - L2 and L3 DCI design patterns - EVPN-based interconnect solutions |
| Topic 2: BGP and Routing in Data Center Environments | - Route reflection and scaling design - Interoperability between routing domains - BGP EVPN address families |
| Topic 3: Operations, Troubleshooting and Best Practices | - Network optimization and scaling considerations - Monitoring SR Linux and EVPN environments - Troubleshooting BGP EVPN and VXLAN issues |
| Topic 4: SR Linux Architecture and Fundamentals | - SR Linux system architecture and components - Configuration and operational models - Network operating system concepts and containerized routing functions |
| Topic 5: EVPN and VXLAN Data Center Fabric | - EVPN route types and MAC/IP advertisement - EVPN control plane fundamentals - VXLAN data plane and encapsulation |
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NEW QUESTION # 50
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: D
NEW QUESTION # 51
Which of the following is NOT part of the description of a BGP route-distinguisher?
Answer: C
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A route distinguisher is used in MP-BGP VPN and EVPN address families to make otherwise overlapping tenant routes unique in the BGP control plane. In EVPN, different tenants or EVPN instances may legitimately use the same MAC or IP values. The route distinguisher makes the NLRI globally unique by prepending a unique value to the tenant route. It is typically unique per PE and per EVI, and it is carried in EVPN route advertisements. However, the route distinguisher does not control route import, export, or service membership. That role belongs to the route target, which is a BGP extended community used by receiving PEs to decide which EVPN instance should import the route. Therefore, option D is not part of the correct description of a route distinguisher. Saying that the RD identifies the EVPN instance in the control plane confuses RD uniqueness with route-target membership. The RD makes routes unique; the route target associates those routes with the appropriate MAC-VRF or IP-VRF import policy. Reference: EVPN route distinguisher, overlapping tenant addresses, route target separation.
NEW QUESTION # 52
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 # 53
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 # 54
Which of the following statements about a L3 EVPN network using symmetric routing 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]:
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 # 55
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