Exam 300-620 topic 1 question 76 discussion

I believe DE is correct.. According to https://haystacknetworks.com/cisco-aci-multi-pod-ipn-inter-pod-network-configuration-verification See these snips: The links (interfaces) between the IPN devices and the spine switches must have the following OSPF configuration on the interfaces (as discussed, these are actually the sub-i nterfaces for VLAN-4). ..... Cisco ACI requires\recommends (works best with) bi-dir multicast as we have many sources and many receivers

When implementing a Cisco ACI Multi-Pod fabric, the Inter-Pod Network (IPN) must meet specific requirements to ensure proper communication and functionality across pods. These requirements include: PIM ASM Multicast Routing: Multicast is required in the IPN to handle BUM (Broadcast, Unknown Unicast, and Multicast) traffic across pods. Specifically, PIM ASM (Protocol Independent Multicast - Any Source Multicast) or PIM Bidirectional is used to replicate BUM traffic between the pods efficiently. OSPF Routing: The IPN must support OSPF (Open Shortest Path First) routing for establishing connectivity between spine nodes and IPN devices. OSPF is used to advertise the TEP (Tunnel Endpoint) pool prefixes between pods and ensure end-to-end IP reachability for VXLAN tunnels.

I believe BE is the correct answer.

answer is DE - BUT as of 5.2, BGP is allowed as underlay protocol, so strictly speaking, this question has 2 possible answers, DE and CD

Uses dot1.q with Vlan4 and OSPF for routing: interface Ethernet1/1.4 description 40G Link to POD1-SPINE-101(1/1) mtu 9150 encapsulation dot1q 4 vrf member fabric-mpod-vrf ip address 192.168.1.253/30 ip ospf network point-to-point

Answer : DE The spine interfaces are connected to the IPN devices through point-to-point routed interfaces. However, traffic originated from the spine interfaces is always tagged with an 802.1q VLAN 4 value PIM Bidir used in the IPN network - Since BUM traffic can be originated by all the leaf nodes deployed across Pods, the use of a different PIM protocol (like PIM ASM, for example) would results in the creation of multiple individual (S, G) entries on the IPN devices that may exceed the specific platform capabilities. With PIM Bidir, a single (*, G) entry must be created for a given BD, independently from the overall number of leaf nodes.

Correct Answer is BE

Correct Answer: BE.Multi-pod needs PIM bidirectional and it works with OSPF routing protocol.