Exam 350-701 topic 1 question 155 discussion

Infrastructure as a Service (IaaS) To deploy your applications to the Cloud, you have to install OS images and relatedapplication software on the cloud infrastructure. In this model, it'syour responsibility to patch/update/maintain the OSand any application software you install. Answer A

I believe the conflict here came from the responsibility For first sight I thought it's C as in PaaS you own the OS, but in fact vendor handing over OS but you use it for your own application, so you're responsible for Application only On the other hand IaaS you have the Infra including OS, but you're responsible for everything including OS patching. If the question was about what model where you have OS then it's PaaS The correct answer is A

A is correct

IaaS cannot be wrong, because it is the model where you are responsible for most of the things. Only hardware patching is cloud responsibility. So all the people who say PaaS is correct - it might be an ADDITIONAL answer for you, but everything you are responsible for in PaaS you are also responsible for in IaaS.

IaaS is the only one where you are responsible for the OS

tenant is key-word so Cisco again, sorry its A

IaaS: In this model, it's your responsibility to patch/update/maintain the OS and any application software you install.

This link has a nice diagram showing the difference between infrastructure, platform and software (as a service) https://azure.microsoft.com/en-us/overview/what-is-paas/#:~:text=Platform%20as%20a%20service%20(PaaS,%2C%20cloud%2Denabled%20enterprise%20applications.

It's A SAAS = Application like SharePoint online, O365 PAAS = Operating system like Windows Azure, Database like SQL Azure IAAS = Windows Azure Virtual Machine and Network, Storage https://www.cmswire.com/cms/information-management/cloud-service-models-iaas-saas-paas-how-microsoft-office-365-azure-fit-in-021672.php (same link with admin reference)