Which file system uses a MapReduce framework to run applications and a NameNode for managing the file system?

An organization plans to deploy a new application in their environment. The new application requires 2 TB of storage space. During peak workloads, the application is expected to generate
9800 IOPS with a typical I/O size of 4 KB. The capacity of each available disk drive is 250 GB.
The maximum number of IOPS a drive can perform at with 70 percent utilization is 90 IOPS.
What is the minimum number of disk drives needed to meet the application's capacity and performance requirements given a RAID 0 configuration?

An Ethernet switch has eight ports and all ports must be operational for 24 hours, from Monday through Friday.
However, a failure of Port4 occurs as follows:
* Monday = 8 PM to 9 PM
* Wednesday 7 PM to 9 PM
* Thursday = 6 AM to 9 AM
* Saturday = 4 PM to 7 PM
What is the MTTR of Port 4?

Which layer contains services that define network behavior through policies and resource requirements in a software-defined networking architecture?

A consumer is interested in a service that provides multiple operating systems and programming frameworks for application development and deployment.
Which recommended cloud service model will meet these requirements?