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| Section | Objectives |
|---|---|
| Topic 1: Data Center Interconnect (DCI) | - Interconnecting data centers with EVPN
|
| Topic 2: SR Linux Data Center Architecture | - SR Linux system fundamentals
|
| Topic 3: EVPN Fundamentals | - VXLAN data plane basics
|
| Topic 4: BGP EVPN Control Plane Operations | - Multi-homing scenarios
|
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NEW QUESTION # 32
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 # 33
Which of the following four symmetric routing options does NOT require the use of an EVPN route-type 2?
Answer: A
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
EVPN route type 2 carries MAC/IP advertisement information. It is central to host-based routing and to designs where the fabric must distribute host MAC-to-IP bindings for integrated routing and bridging. In host routing, RT-2 is required because individual host reachability is signaled through MAC/IP advertisements. In interface-less prefix routing, RT-2 is still needed because the system relies on host or gateway MAC/IP information associated with the IRB and distributed gateway behavior. Interface-ful unnumbered designs may also require RT-2-style information to resolve next-hop or adjacency behavior because the routed interface does not use a conventional numbered next-hop model. Prefix routing with interface-ful numbered operation is different. In that model, the routed interface has explicit IP addressing and prefix reachability can be carried with L3 prefix routes without requiring EVPN RT-2 host MAC/IP advertisement as a dependency. Therefore, the symmetric routing option that does not require EVPN route type 2 is prefix routing interface-ful numbered. Reference: symmetric L3 EVPN routing models, RT-2 MAC/IP advertisements, prefix routing behavior.
NEW QUESTION # 34
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 # 35
Consider the exhibit.
The network is configured for interface-less symmetric routing with an ECMP of 4 enabled on all leaf routers.
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]:
In interface-less symmetric L3 EVPN routing, hosts in a subnet may be attached to different leaf routers, while inter-subnet forwarding is performed through the IP-VRF using VXLAN routed interfaces. The ingress and egress PEs both participate in L3 forwarding, and the routed VXLAN interface provides the per-IP-VRF overlay data-plane construct needed for symmetric routing. The IRB interfaces on the local MAC-VRFs must advertise learned local host routes so that remote PEs have the necessary host reachability information. The MAC-VRFs also need the appropriate EVPN control-plane configuration so host MAC/IP information can be exchanged, while the IP-VRF participates in L3 VPN-style route exchange for routed reachability. Option A is false because anycast gateway is not optional in this design for Leaf1 and Leaf2. Anycast gateway allows the same default-gateway IP and virtual MAC behavior to exist consistently on multiple leaves serving the same subnet. Without it, host default-gateway behavior would be inconsistent and traffic mobility across the fabric would break expected distributed gateway operation. Reference: interface-less symmetric routing, IRB, anycast gateway, routed VXLAN interface.
NEW QUESTION # 36
Consider the exhibit.
Which of the following statements about the configuration and operation of this setup is TRUE?
Answer: D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
This setup represents a Layer 2 EVPN multi-homing attachment where the host is connected to Leaf1 and Leaf2 through an Ethernet Segment named ES-1. In SR Linux EVPN multi-homing, the Ethernet Segment must be associated with the physical or logical attachment interfaces facing the host. This allows the PEs to advertise Ethernet Segment information into EVPN, participate in DF election, and apply the appropriate forwarding behavior for single-active or all-active redundancy. Option D is therefore correct. Option A is not necessarily true because the exhibit indicates an active/standby style attachment, not all-active operation. Option B is also incorrect because ECMP on the remote MAC-VRF is not the mechanism that defines the local ES association or single-active behavior. Option C is wrong in this setup because a host LAG is required for common all-active L2 multi-homing with LACP, but the shown design uses an active/standby-style attachment where the Ethernet Segment is bound to the host-facing ports. The technical anchor is that ES-1 must be associated to the access ports connecting the host into the multi-homed MAC-VRF service. Reference: L2 EVPN multi-homing, Ethernet Segment interface association, DF behavior.
NEW QUESTION # 37
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