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Nokia 4A0-D03 Exam - Topic 5 Question 5 Discussion

Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?
C) All the MAC-VRFs connected to the L3 EVPN network must exist on each PE.
A) If a host interface's has two IP addresses, it must send out two separate EVPN route-type 2 updates for the MAC-VRF.
B) Each PE must have a full ARP table for all of the hosts in the L3 EVPN network.
D) The ingress and egress PE routers will perform both MAC and IP forwarding.

Nokia 4A0-D03 Exam - Topic 5 Question 5 Discussion

Actual exam question for Nokia's 4A0-D03 exam
Question #: 5
Topic #: 5
[All 4A0-D03 Questions]

Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?

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Suggested Answer: C

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.


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Lai
2 minutes ago
I think I remember that statement B might be tricky. I’m not sure if every PE really needs a full ARP table for all hosts.
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