Explanation/Reference:
Explanation:
https://technet.microsoft.com/en-us/library/mt422830.aspx
https://technet.microsoft.com/en-us/library/mt422821.aspx
Testlet 1
Overview
General Overview
Litware, Inc., is an international manufacturing company that has 4,000 employees. The company has a sales department, a marketing department, a research department, and a human resources department.
Litware has a partner company named Fabrikam, Inc. Fabrikam has an office in Paris. Fabrikam uses a XMPP-based instant messaging (IM) solution.
Physical Locations
Litware has seven offices located throughout North America and Europe.
Litware has two data centers. The data centers are located in New York and London. All communications for the North American offices are routed through the New York data center. All communications for the European offices are routed through the London data center.
The number of users in each office is shown in the following table.

Active Directory Environment
Litware has an Active Directory Domain Services (AD DS) forest named litwareinc.com. The forest contains a single domain. All domain controllers run Windows Server 2008 R2.
Each office contains five domain controllers. Each office is configured as an Active Directory site.
Lync Server Environment
Litware has a Lync Server 2013 infrastructure that contains two servers in the New York office. The servers are configured as shown in the following table.

The SIP domain is litwareinc.com.
Litware has a Microsoft Exchange Server 2013 organization.
Problem Statements
Users in the London office report poor video quality during conferences.
Requirements
Business Goals
Litware wants to minimize the costs associated with purchasing hardware and software.
Planned Changes
Litware plans to migrate the Lync Server 2013 infrastructure to Skype for Business Server 2015. The migration will have a coexistence period of six months.
Litware plans to implement the following components as part of the planned migration:
Persistent Chat

Unified contact store

Enterprise Voice for all users

Acentral site in each data center

A branch site in each branch office

A Front End pool in each central site

Skype for Business Phone Edition devices

Pool pairing

Litware plans to create a federation relationship with Fabrikam.
Technical Requirements
Litware identifies the following technical requirements for the planned migration:
Users must be able to use all Skype for Business Server features if a single server fails.

Users must be able to connect to the Skype for Business Server infrastructure if a single central site

fails.
Members of a group named Temp_Contractors must be prevented from using Skype for Business

when they connect remotely.
Only users in the human resources department must be able to access and discover a persistent chat

room named HRConfidential.
Security Requirements
Litware plans to deploy remote access. Some users work remotely from their customers' offices, which have firewall restrictions. All of the remote users must be able to connect to the Skype for Business Server
2015 infrastructure by using TCP port 443.