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Microsoft Network Readiness and Assessment for Lync Sample Questions:

1. HOTSPOT
You analyze the results of Lync traffic modeling for a customer's network. The relevant portion of the network topology diagram is shown in the answer area.
The estimated links workload is shown in the following table:

The customer wants to build a highly available Lync infrastructure.
You need to determine which link must be updated to support the customer's requirements.
Which link should you update? (To answer, select the appropriate link in the network
topology diagram.)

2. Your client network includes a main office located in Toronto and five branch offices connected to the main office by a Multiprotocol Label Switching (MPLS) network. The main office is connected to the Internet through a 100 Mbps link.
You complete Lync traffic modeling based on the values provided by the client- The relevant portions of Lync Bandwidth Calculator tool information include:
Site definitions and its WAN link info as shown in the exhibit (Click the Exhibit button.)
Central Sites RTC Bandwidth Required Vs. Available as shown in the exhibit (Click the Exhibit button.)
Branch Sites RTC Bandwidth Required Vs. Available as shown in the exhibit (Click the Exhibit button.)



You prepare a final report with the results of the Lync network readiness assessment.
You need to include a recommendation in the report.
What should you recommend to the client?

A) Upgrade the WAN link in the Montreal office at least to 20 Mbps.
B) Upgrade the WAN link in the Regina office to at least 15 Mbps.
C) Allocate 30 Mbps bandwidth of WAN link to RTC traffic in the Toronto office.
D) Allocate 4 Mbps bandwidth of WAN link to RTC traffic in the Regina office.

3. You are analyzing the collected data about the current environment.
You need to identify the information that will be used to develop usage modeling to fulfill the business requirements.
Which three pieces of information should you choose? (Each correct answer presents part of the solution. Choose three.)

A) results of traffic simul-ation
B) total minutes of video conferences used per month
C) number of public switched telephone network (PSTN) channels provisioned
D) average meeting size and duration
E) number of users at each location

4. Your company corporate telephony environment is a combination of Lync 2013 and traditional Private Branch Exchange (PBX). The sites 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. The company plans to add additional bandwidth for all sites.
The company is concerned about the number of dropped calls on the PBXs.
As part of a bandwidth upgrade process, you model real-time transport protocol (RTP) media call flows for audio communications. You have determined the average number of calls and estimated the bandwidth required for the audio portion of the calls.
You need to identify the additional bandwidth requirements when modeling real-time transport control protocol (RTCP) traffic.
Which bandwidth option should you choose?

A) 5 kilobits per second (kbps) per stream
B) 20 kilobits per second (kbps) total
C) 20 kilobits per second (kbps) per stream
D) 5 kilobits per second (kbps) total

5. ===============================
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 site-to-site virtual private network (VPN) between the Vancouver and Seattle offices.
C) The internet connection at the Seattle office.
D) The PSTN connection at the Vancouver office.
E) The internet connection at the Vancouver office.

Solutions: