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Vendor: Microsoft
Exam Code: 74-335
Exam Name: Lync Network Readiness Assessment

Case Study 1 – A Datum Corporation (Question 1 – Questions 15)
Based in North America, A. Datum Corporation is a leading financial technology solutions provider. The company provides mortgage lending processing, payment solutions, call centers, and other services for the largest Canadian and US financial institutions. A. Datum Corporation has its main office and a data center in Toronto. Call centers are located in Montreal and Quebec. Branch offices are located in other cities across Canada and the United States. The company plans to consolidate multiple isolated voice communication systems used across the office sites by a single scalable and secured unified communications (UC) solution. The company evaluated several UC vendors and has decided to deploy Microsoft Lync 2013. A. Datum Corporation has grown very fast within the last few years. The company has made multiple acquisitions. Each acquired company had its own information technology (IT) policies and support procedures, and some branch offices still operate relatively independently. As a result, the existing network and server infrastructure is very inconsistent.

Existing Environment
A. Datum Corporation has consolidated all production servers in the data center. Network switches and routers are mounted in the data center and in secured racks in the offices. Audio conferencing services for all employees are provided by a dial-in conferencing provider. Video conferencing services are available in designated meeting rooms at various offices and are based on an eight-year-old third-party solution. All offices, except the call centers, are linked by a Multiprotocol Label Switching (MPLS) network. The call centers are connected with the data center by virtual private network (VPN) links. Quality of Service (QoS) is not currently implemented, but network specialists have detected that all existing equipment is compatible with possible QoS implementation. The network topology diagram is shown in the Network Topology Diagram exhibit- (Click the Exhibit button.) The diagram shows bandwidth capacity of primary wide area network (WAN) links. All offices also have backup WAN links with bandwidth capacity of 50 percent of the matching primary WAN link.
Existing average primary WAN links workload is shown in the following table:
Call center statistics show a steady increase in average call duration. Fifteen percent of call center incoming public switched telephone network (PSTN) calls are transferred to employees located in other offices.
Business Requirements
A. Datum Corporation wants to evaluate the existing network infrastructure to ensure that the infrastructure is capable of meeting the company’s expectations of the new UC solution. All existing phones will be replaced with voice over Internet protocol (VoIP) Power over Ethernet (PoE) phones. Employees who travel between offices or work remotely must be able to use the Lync 2013 client installed on their laptops to make phone calls. The proposed Lync deployment and possible QoS policies should not increase existing average network traffic delays for existing applications. Audio conferencing traffic for employees in the call center sites must be limited. The call centers must support monthly workload fluctuations from 50 to 200 contract employees who serve customers’ incoming PSTN calls. Audio communication between the offices must be operational 24 hours a day, seven days a week. Audio communication must remain available in a case of an external power failure at any office or at the data center. The company also plans to improve the quality of call center services by decreasing the rate of dropped calls due to busy PSTN lines. The network must be able to automatically switch to backup WAN links without any degradation of audio call quality.
Technical Requirements
All communications within the UC infrastructure must be secure due to compliance requirements for processing credit card information. Wireless networks are restricted in the call centers; however, several other offices have implemented wireless guest networks. Lync Edge Servers and Conference Servers will be located in the data center. Existing analog and digital Private Branch Exchanges (PBXs) will be replaced with Lync Mediation Servers. The existing video conferencing solution will remain untouched and left without Lync integration. The network infrastructure must provide maximum network latency for real-time communication (RTC) traffic of 150 ms between any two offices. Available bandwidth for the Lync RTC traffic is limited to 20 percent of the primary WAN links bandwidth.
Lync Traffic simu-lation
The initial Lync traffic simu-lation has been completed for the following locations:
Toronto data center
A. Datum Corporation wants to design and perform an additional Lync traffic simu-lation for all other offices. The additional simu-lation must also include external users that connect through the Edge Server and simulate phone calls to the Mediation Server. An output of the tracert.exe tool running from a desktop computer in the Quebec call center was captured during the initial Lync traffic simu-lation. The output is shown in the Quebec Traffic simu-lation Output exhibit. (Click the Exhibit button.)
An output of the pathping.exe tool running on a computer located in the Montreal call center was captured during the initial Lync traffic simu-lation. The target computer is located in the data center. The output is shown in the Montreal Traffic simu-lation Output exhibit. (Click the Exhibit button.)
The table below shows peak traffic delays between several offices during the initial Lync traffic simu-lation.
A portion of the initial Lync traffic simu-lation summary is shown in the table below. The table compares estimated (modeled) and simulated real-time communications (RTC) traffic over WAN links.

You are developing a scope of work (SOW) document for the Discovery phase in the call centers. You need to identify the deliverables to include. Which piece of information should you include?

A.    business hours of the offices and call centers
B.    average duration of calls
C.    available capacity of the uninterruptible power supply (UPS) devices located in rack mounts in the offices
D.    inventory of Windows domains and workgroups

Answer: C

You need to run a Lync traffic simu-lation for the Dallas office. What should you do first?

A.    Install Power over Ethernet (PoE) phones in the office.
B.    Determine whether sufficient bandwidth is available.
C.    Failover the office to a backup wide area network (WAN) link.
D.    Implement Quality of Service (QoS) policies.

Answer: B

You need to validate the Lync 2013 implementation design traffic simu-lation scenario based on the existing network environment. Which two actions should you perform during a test run? (Each correct answer presents part of the solution. Choose two.)

A.    Confirm that Lync Server is configured correctly.
B.    Confirm that the network infrastructure is configured correctly.
C.    Confirm that Quality of Service (QoS) policies are being correctly applied.
D.    Determine whether any congestion patterns develop within the network.

Answer: CD

You need to collect relevant information about the existing video conferencing solution. Which piece of information should you collect?

A.    video codecs used by the third-party video conferencing solution
B.    conferencing usage statistics
C.    echo cancellation capabilities with third-party video appliances
D.    base video resolution used by the third-party video conferencing solution

Answer: B

You want to perform a traffic simu-lation for the Dallas office. You need to identify the location to place the second probe. Which location should you select?

A.    Detroit office
B.    location where Lync Conferencing services will reside
C.    location that has the most congested network
D.    Atlanta office

Answer: B

Hotspot Question
You need to identify the wide area network (WAN) link between the Detroit office and the data center that shows unacceptable performance. Which link on the network topology diagram should you choose? (To answer, select the appropriate link in the answer area.)


You need to recommend changes to improve the quality of Lync calls for users in the Detroit and Chicago offices. Which change should you recommend?

A.    Upgrade the data center’s Multiprotocol Label Switching (MPLS) link to 1,100 megabits per second (Mbps).
B.    Implement Quality of Service (QoS).
C.    Upgrade the wide area network (WAN) links at these offices to 30 megabits per second (Mbps).
D.    Connect the offices to the Multiprotocol Label Switching (MPLS) network from Provider- 1.

Answer: D

You need to recommend a network upgrade based on the results of the Lync traffic simu- lation. Which upgrade should you recommend?

A.    Upgrade the backup Internet connection at the Quebec call center.
B.    Upgrade the backup Multiprotocol Label Switching (MPLS) link at the Toronto data center.
C.    Upgrade the backup Internet connection at the Toronto data center.
D.    Upgrade the backup Internet connection at the Montreal call center.

Answer: A

You need to manage voice traffic for the call centers. What should you do?

A.    Define Call Admission Control (CAC) policies.
B.    Modify the Lync Client policy for the call center users.
C.    Modify the Lync Global Conferencing policy.
D.    Define all audio traffic as non-real-time traffic.

Answer: A

Drag and Drop Question
You need to configure the Lync Server 2013 Stress and Performance Tool to simulate public switched telephone network (PSTN) traffic. Which four actions should you perform in sequence? (To answer, move the appropriate four actions from the list of actions to the answer area and arrange them in the correct order.)


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

Answer: BCE

You need to perform an additional traffic simu-lation for validating Lync Server implementation in the call centers. What should be the minimum duration of the simu- lation?

A.    one week, business hours only
B.    one week, 24 hours a day
C.    one month, business hours only
D.    one month, 24 hours a day

Answer: D

Drag and Drop Question
You need to calculate the estimated number of incoming lines required to serve the future needs of the call centers. How should you adjust the parameters in your calculation? (To answer, drag the appropriate parameter or parameters to the correct adjustment or adjustments in the answer area. Each parameter may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)


Hotspot Question
You need to determine which hop or hops between the Quebec call center and the data center should be further investigated for high raw jitter values. Which hop or hops should you select from the output of the tracert.exe tool? (To answer, select the appropriate line or lines in the command screen showing output of the tracert.exe tool.)


Hotspot Question
You need to determine which hop between the Montreal call center and the data center must be further investigated due to unacceptable performance. Which line in the output of the pathping.exe tool indicates the unacceptable performance? (To answer, select the appropriate line in the in the pathping.exe tool output.)