What is machine learning? Differentiate among supervised learning vs unsupervised learning vs reinforcement learning.

Assume that an office has three departments and each department has 50 to 70 employees who are using computers with Windows operating systems. The office space is designed in such a way that an employee can use any computer within a department. Once an employee logs in from a computer, he/she will get access to his files from the server. Let you are planning for network and server setup for this company.

a. What is Active Directory? Do you need an Active Directory for such an office? If yes, briefly explain its use under this circumstance.

b. What is a subnet? What benefits will you get using subnets for this office?

Briefly describe the following network devices: Repeater, Hub, Bridge, Switch and Router.

What are the different types of transmission media used for data communication? Explain their advantages and disadvantages.

What is SaaS and multi-tenant architecture? How are they related? What are the advantages and disadvantages of multi-tenancy? For a multi-vendor e-commerce application, you can choose a database architecture where you can put all the vendors in a single database or each vendor in a separate database. Which architecture will you follow and why?