5.Why do some large enterprises still build their own private cloud even when advanced public cloud services are available? If public cloud claims to be secure, what makes these organizations feel it's not secure enough and at what cost?

4.Can an application run across multiple cloud providers (e.g., AWS + Azure)? What model is this called, and what are the risks?

3.If SaaS is so easy, why do some companies still prefer PaaS or IaaS for internal apps?

2.In a Hybrid Cloud setup, what happens if the network connection between the public and private cloud fails?

1.If a company is using IaaS, can it later shift the same app to PaaS without changing the app itself?