Case Study
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Overview
Contoso, Ltd. is an international manufacturing company that has 30,000 users.
Contoso has the following departments: sales, research, marketing, human resources, executive, manufacturing, and legal. The sales department has 2,000 users. All of the users in the sales department are located in the United States. The research department has 3,000 users. All of the users in the research department are located in Europe.
Physical Locations
Contoso has two main offices. The offices are located in Houston and Frankfurt. Each office has 15,000 users.
The offices connect to each other by using an MPLS network. Each office connects directly to the Internet.
Existing Environment
Lync Server Infrastructure
Contoso has a Lync Server 2013 infrastructure that only uses internal instant messaging (IM) and presence. The infrastructure contains a single Enterprise Edition Front End pool that services all of the users.
Contoso uses a SIP domain of contoso.com for all of the users.
Client computers have either Microsoft Lync 2010 or Microsoft Lync 2013 installed.
Before deploying Skype for Business Server 2015 and migrating the users, you implement a small pilot project to test the functionality of Skype for Business Server 2015.
Problem Statements
The users in the pilot report that occasionally they cannot sign in to Skype for Business 2015.
Requirements
Business Goal
Contoso plans to upgrade to Skype for Business Server 2015 during the next six months. Contoso must deploy all of the conferencing and edge services. Contoso must also configure federation with its parent company, which is named Proseware, Inc. Proseware is located in Europe and has a Lync Server 2010 infrastructure.
Contoso must minimize hardware and software purchasing costs, while guaranteeing performance levels for all Skype for Business Server 2015 workloads.
Planned Changes
Contoso plans to implement the following workloads in the Skype for Business Server 2015 deployment:
Federation

Dial-in conferencing

External user access

Audio, video, and web conferencing

The ability to host Lync meetings that have external participants

The FQDNs of the edge services will be configured as shown in the following table.

Technical Requirements
Contoso identifies the following technical requirements for the planned deployment:
Only federation to Proseware must be allowed.

All of the edge services must use default ports.

Wide area network (WAN) traffic and Internet traffic must be minimized.

All of the user contacts stored in Skype for Business Server 2015 must be backed up.

The sales department must have a dedicated dial-in conferencing number. All other users in both the

United States and Europe must use a pool of regional dial-in conferencing numbers.
If a single component fails, all Skype for Business services must remain available without the need for

manual intervention. Performance degradation is acceptable during a component failure state.
The conversations of all the sales department users must be archived for 30 days. The conversations

of all the research department users must be archived for 90 days. No other conversations must be archived.
After the migration to Skype for Business Server 2015, all client computers will have three months to

upgrade to Skype for Business. After three months, legacy clients must be blocked from accessing the Skype for Business Server 2015 infrastructure.
Security Requirements
Contoso identifies the following security requirements for the planned deployment:
All Skype for Business Server conferences must use a unique URL.

Each Internet-facing service must have one or more dedicated public IP addresses.

Only the users in the human resources department must be prevented from connecting to Skype for

Business Server 2015 remotely.
You need to identify the dial-in conferencing configurations for sales department users.
Which two configurations should you use? Each correct answer presents part of the solution.