Explanation/Reference:
Explanation:
The Microsoft Connectivity Analyzer (MCA) tool is a companion to the Microsoft Remote Connectivity Analyzer web site. The MCA tool provides administrators and end users with the ability to run connectivity diagnostics for five common connectivity symptoms directly from their local computer.
One of the five symptoms that can be tested using MCA is:
"I can't log on to Skype for Business on my mobile device or the Skype for Business Windows Store App" - This test checks for the Domain Name Server (DNS) records for your on-premise domain to ensure they are configured correctly for supporting Mobile Skype for Business clients. Also it connects to the Autodiscover web service and makes sure that the authentication, certificate, web service for Mobility is correctly set up.
Testlet 1
Background
Fabrikam is a manufacturing company. You manage an on-premises Microsoft Exchange Server environment as well as an Exchange Online environment that is set up as a hybrid environment for the Fabrikam.com and devfabrikam.com domains. The company recently merged with Tailspin Toys. They have also bought another company named Contoso.Ltd. There are no plans to merge with Contoso.Ltd. as that company's resources will remain separate from Fabrikam, Inc.
Domains
Fabrikam, Inc. has two separate Active Directory Domain Services (AD DS) domains. The domain named fabrikam.com is used for production. The domain named devfabrikam.com is used for development only.
Tailspin Toys has an AD DS domain named tailspintoys.com. Contoso Ltd. has an AD DS domain named contoso.com.
The development environment is used to deploy new features that are being tested for implementation in the production environment. No features can be deployed into production until they have been fully tested in the development environment. There is a third-party multi-factor authentication (MFA) solution that is currently deployed for on-premises sign-ins in the devfabrikam.com domain. You are investigating different single sign-on (SSO) options including Active Directory Federations Services (AD FS) for the devfabrikam.com domain.
Fabrikam, Inc. is completing its merger with TailSpin Toys and is decommissioning the tailspintoys.com namespace and moving those users to fabrikam.com.
Fabrikam has Microsoft Azure Active Directory (Azure AD) Connect configured and has integrated both the fabrikam.com and devfabrikam.com domains with Office 365. SSO is configured for both the fabrikam.com and devfabrikam.com domains.
The Office 365 environment must meet the following requirements:
SSO must be used for all Office 365 authentication in production and development environments for all

domains.
Sign in time restrictions must be enabled for all contoso.com users in the Office 365 environment.

Exchange Online must be used for all production employee mailboxes.

The on-premises contoso.com domain must be integrated with Office 365.

Contoso.com must be used for the primary namespace in Office 365 for Contoso.Ltd. employees.

Infrastructure
The server infrastructure must meet the following requirements:
Production environment
All new applications that require relational database support must use Microsoft SQL Server 2016.

All new projects must minimize the number of servers required.

All new projects must minimize the complexity of the design and topology of the server infrastructure.

All externally facing servers must be deployed in a perimeter network.

All new server deployments should be redundant when possible.

Development environment
The development environment must support workplace join.

On-premises MFA must be used for all development accounts.

Issues
Users report that they receive many unwanted emails. You need to a create a list of the users that receive the most unwanted emails, and a list of the senders of these emails. This report information needs to be automatically collected daily.
Users also report the following issues:
The mailbox named [email protected] is hosted in the on-premises Exchange Servers.

This user is not able to view free/busy for [email protected]. Test.User1 has issues viewing free/busy from both Microsoft Outlook 2016 on a desktop computer as well as the Outlook app on a mobile device.
The [email protected] account has a mailbox that is hosted in the Exchange Online

environment.
The [email protected] is hosted in Exchange Online. Alex reports Outlook 2016 issues.

The client application starts up connects to his mailbox, but it will then crash after a few minutes.
The mailbox named [email protected] is hosted in Exchange Online. An Exchange Online

mailbox database issue affected Lola and some other users in the human resources department. You need to troubleshoot client connectivity issues with Lola's mailbox.
The mailbox named [email protected] account is hosted in Exchange Online. Sarah reports

than emails that she sends are not being received. You must inspect emails that Sarah has sent recently to investigate the issue.