An engineer is in the process of discovering a new Cisco ACI fabric consisting of two spines and four leaf switches. The discovery of leaf 1 has just been completed. Which two nodes are expected to be discovered next? (Choose two.)
CE is the right answer - as per the Cisco Links below.
"Each APIC instance in the cluster first discovers only the leaf switch to which it is directly connected. After the leaf switch is registered with the APIC, the APIC discovers all spine switches that are directly connected to the leaf switch."
Leaf 1 will have a connection into both spines and as per the Cisco white paper text above I am sticking with CE.
Correct answers are A and C.
In a scenario where you have two spines and four leafs, logic assumes that leaf1 is connected to spine1, where discovery process starts. Once spine1is discovered next visible devices will closest connected downlinks (e.g. leaf2), and only then spine2 and so on.
follow the bread crumbs in the Apic discovery process - what is the next hop after spine 1 -> likely leaf2 [no direct links between spines] assuming the seed leaf is leaf1 where the Apic would most likely be situated when starting provisioning.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/3-x/getting_started/b_APIC_Getting_Started_Guide_Rel_3_x/b_APIC_Getting_Started_Guide_Rel_3_x_chapter_0100.html
therefore AC
Switch Discovery
About Switch Discovery with the APIC
The APIC is a central point of automated provisioning and management for all the switches that are part of the ACI fabric. A single data center might include multiple ACI fabrics; each data center might have its own APIC cluster and Cisco Nexus 9000 Series switches that are part of the fabric. To ensure that a switch is managed only by a single APIC cluster, each switch must be registered with that specific APIC cluster that manages the fabric.
The APIC discovers new switches that are directly connected to any switch it currently manages. Each APIC instance in the cluster first discovers only the leaf switch to which it is directly connected. After the leaf switch is registered with the APIC, the APIC discovers all spine switches that are directly connected to the leaf switch. As each spine switch is registered, that APIC discovers all the leaf switches that are connected to that spine switch. This cascaded discovery allows the APIC to discover the entire fabric topology in a few simple steps.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/3-x/getting_started/b_APIC_Getting_Started_Guide_Rel_3_x/b_APIC_Getting_Started_Guide_Rel_3_x_chapter_0100.html
The APIC discovers new switches that are directly connected to any switch it currently manages. Each APIC instance in the cluster first discovers only the leaf switch to which it is directly connected. After the leaf switch is registered with the APIC, the APIC discovers all spine switches that are directly connected to the leaf switch.
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