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Topic 3, Contoso Ltd
Background
Contoso, Ltd. is a Canadian business law firm that currently employs 300 people. Contoso operates a main office in Vancouver that houses 250 employees and a branch office in Seattle that houses 50 employees. All Contoso users are Lync-enabled.
Contoso plans to introduce a remote disaster recovery data center to host remote replicas of key services, including Active Directory, Lync, Exchange, and files and legal software, Contoso is launching a hybrid configuration of Office 365 to validate the cloud-based Exchange Online service.
Contoso also plans to acquire a small law firm in Vancouver called Litware, Inc., which has 80 employees. Litware currently uses a 10-megabit per second (Mbps) Internet connection. Half of Litware employees will use Lync services. All Lync-enabled users in Litware will use Instant Messaging only. Currently, Instant Messaging concurrent usage at Litware is 50 percent during peak hours.
There is a possibility that Contoso will make two more acquisitions during the next three years. Vancouver and Seattle employees have submitted support tickets to report poor quality of outbound Lync calls to external users. A user activity report collected by the help desk department is shown in the User Activity Report section.
There is a concern that in the future, the volume of Lync traffic may reach up to 50 percent of the current bandwidth available in the Vancouver office.
User Activity Report


Existing Environment
The core portion of the infrastructure is located in the Vancouver data center, although the Seattle data center also has two servers (listed below) to provide redundancy of Active Directory and data services. The following services and applications comprise Contoso's infrastructure in Vancouver and Seattle:
Vancouver Data Center

Seattle Data Center

An overview of the network infrastructure of Vancouver and Seattle data centers is shown in the exhibit. (Click the Exhibit button.)

All users in the Vancouver and Seattle offices use the Microsoft Windows 8 Enterprise operating system and Lync phones that are enabled for Enterprise voice. Contoso expects to see a growing number of remote users. They anticipate that up to 20 percent of users in Vancouver might work remotely.
Contoso has defined a team of 35 users who will participate in a pilot deployment of the Office 365 hybrid configuration.
The offices in Vancouver and Seattle are using 5-Mbps Internet connections. Contoso has a site-to-site VPN between the Vancouver office and the Seattle office. All external outbound calls from the Vancouver and Seattle offices are routed outside through the office in Vancouver.
Business Requirements
Contoso needs to review the existing network topology as well as the Lync 2013 infrastructure to ensure that network capacity is sufficient to accommodate the Litware, Inc. Lync users in the future.
Contoso expects to see up to 85 percent of simultaneous instant messaging and 25 percent of public switched telephone network (PSTN) calls during business hours. All existing issues that relate to poor quality of outbound Lync calls need to be addressed as well.
Contoso wants to ensure the following: - Current network bandwidth allocated to the Vancouver office is sufficient to sustain the future volume of Lync traffic and guarantee high quality of Lync calls. - Volume of Lync traffic does not exceed 25 percent of the WAN bandwidth.
Contoso plans to redesign the existing site-to-site VPN solution between the Vancouver and Seattle offices to implement a robust and reliable WAN solution with end-to-end support of Quality of Service (QoS).
The recommended design solution needs to eliminate the possibility of WAN oversubscription by Lync traffic.
The proposed Lync 2013 solution needs to be: - Scalable to accommodate the company's future acquisitions. - Readily available for Vancouver and Seattle users.
In case of a disaster, a manual switchover of Lync services to the disaster recovery datacenter should be available.
Technical Requirements
All Session Initiation Protocol traffic (SIP) traffic must be encrypted.
All external Lync 2013 services must be protected by a firewall.
A commercial third-party certificate must be used on the external interface of Lync 2013
Edge servers.
The Role-Based Access Control (RBAC) model will be implemented to delegate basic
administrative tasks to the Lync help desk team.
All maintenance of Lync servers must be performed outside of business hours.
The proposed architecture solution must support interoperability between Lync 2013 and
Exchange 2013.
The Microsoft Lync 2013 Bandwidth Calculator must be used to analyze Lync traffic. The
QoS end-to-end support needs to be implemented.
===============================
You need to determine which connection will be most affected by the Office 365 users.
Which two connections should you select? (Each correct answer presents part of the solution. Choose two.)

A) The PSTN connection at the Seattle office.
B) The internet connection at the Seattle office.
C) The internet connection at the Vancouver office.
D) The site-to-site virtual private network (VPN) between the Vancouver and Seattle offices.
E) The PSTN connection at the Vancouver office.

2. Your customer's network includes three offices and two data centers that are connected by wide area network (WAN) links. Your customer has documented and modeled Lync usage within the current environment.
You review the customer's model and confirm that it is accurate.
You need to recommend the next step in the Lync network readiness assessment.
What should you recommend as the next step?

A) Calculate audio capacity for a public switched telephone network (PSTN).
B) Perform traffic simu-lation.
C) Calculate bandwidth estimations over the WAN links.
D) Implement Quality of Service (QoS).

3. You perform a network readiness assessment for Lync deployment.
The organization's network includes a head office and 400 branch offices. All branch offices are connected to the head office with a Multiprotocol Label Switching (MPLS) link.
You have completed the traffic simu-lation. The Usage Modeling Data for the Beijing site is shown in the following table:

A summary of the simu-lation results is shown in the table below:

Detailed simu-lation results are shown in the following exhibits:
One Way Network Delay {Click the Exhibit button.)
Average Jitter (Click the Exhibit button.)
Maximum Jitter (Click the Exhibit button.)
Average Packet Loss (Click the Exhibit button.)
Maximum Consecutive Loss (Click the Exhibit button.)





You need to provide recommendations based on the simu-lation results.
What should you recommend?

A) Increase WAN link bandwidth.
B) Monitor Quality of Experience (QoE).
C) Implement Call Admission Control (CAC) on Lync for the affected sites.
D) Restrict video capability or reduce quality codec usage for certain user groups.

4. Your company corporate telephony environment is a combination of Lync 2013 and traditional Private Branch Exchange (PBX). The company has three sites that are connected by a Multiprotocol Label Switching (MPLS) topology. There are 750 users who are using Lync 2013 and 2,500 users who are using the PBX environment. On average, the company has 10 percent of its users in conferences.
Multiple users report dropped calls and poor voice quality. The company is planning to add additional bandwidth for all sites.
You plan to generate and collect simulated traffic and then analyze the variations in the baseline network characteristics for each audio call.
You need to collect the baseline network characteristics to simulate peer-to-peer (P2P), conference, and public switched telephone network (PSTN) communications.
Which three pieces of information should you collect? (Each correct answer presents part of the solution. Choose three.)

A) cycle jitter
B) burst packet loss
C) sampling jitter
D) one-way network delay
E) average jitter
F) jitter period

5. You need to determine whether the environment meets technical requirements for Lync apps on mobile devices from outside of the perimeter network.
Which two utilities should you use? (Each correct answer presents a complete solution. Choose two.)

A) Remote Connectivity Analyzer
B) Lync Server 2013 Control Panel
C) Lync Connectivity Analyzer
D) Remote UC Troubleshooting Tool (RUCT)

問題與答案：