Resolution: Option A is correct, Resolution: AZ and DC can be flexibly mapped according to the actual deployment situation. For example, in a large-scale public cloud, an AZ can contain multiple DCs, in a small and medium-sized private cloud, multiple sets of independent AZs can be set up in a DC, and a DC can be planned as one AZ, where DC and AZ are equivalent. Option B is wrong, as can be seen in the following diagram
The ratio of Router to vFW is N:1
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