Exam Code: 74-335
Exam Name: Lync Network Readiness Assessment
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
* To begin the process of usage modeling, you should ask a number of general questions:
How many site locations are there?
(B) How many users are at each site location?
How many users will always be remote?
What are the future growth estimates?
What sort of WAN technology/topology is deployed? What is your overall WAN link speed?
What is the maximum/current available bandwidth for Lync traffic per WAN link?
* A key ingredient in defining personas is to review the existing private branch exchanges (PBXs) or real-time communications system infrastructure capacity.
This data helps to validate any personas and usage models that you create. It also helps to indicate any future capacity planning requirements for Lync servers, and other adjunct systems required. Evaluate the following information, if available, for usage modeling:
Number of PBXs implemented.
Number of public switched telephone network (PSTN) channels provisioned. Number of any intersite tie connections between PBXs, or whether intersite calls are made through the PSTN.
Number of users at each location.
Call data records (CDRs) for PSTN traffic usage. Usage statistics, such as the maximum number of concurrent calls during the busy hour:
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
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.)
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.)
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.)
Case Study 2 – Humongous Insurance (Question 16 – Questions 27)
Humongous Insurance currently employs 7,500 people and is based in the United States. The company has 4,000 users in its main office in Chicago. It also has two branch offices, one in New York with 2,000 users and the other in Los Angeles with 1,500 users. The company has 30 executives located across the offices.
The company recently migrated from Lync Server 2010 to Lync Server 2013. The company plans to increase the use of audio and video (A/V) conferencing to reduce travel costs. Employees have been asked to use A/V, telephony, and instant messaging (IM) conferencing solutions whenever possible for communication with clients and users in the branch offices.
Humongous Insurance is federated with Trey Research Corporation, which uses a third- party IM. Users at both companies need to communicate with each other by using their respective IM client.
The company plans to continuously analyze the network to identify:
potential network delay points and
availability of adequate bandwidth to meet current requirements and anticipated growth.
The company plans to continuously analyze the Lync 2013 servers for performance metrics.
Humongous is in discussion to acquire the Southridge Video company. Southridge Video has 2,000 users in two sites.
Employees of Humongous Insurance use a variety of mobile devices, including Windows Phones and iOS phones. All iOS phone users must be notified of events, such as new or missed IM invitations and voice mail messages, even when they are using the corporate wireless network.
All public switched telephone network (PSTN) traffic will use the G.711 codec.
All voice will use the RTAudio Wideband codec.
All peer-to-peer (P2P) video sessions will support H.264 and RTVideo codecs. Audio bandwidth between the Los Angeles and New York offices is limited.
All users report poor audio and video quality. Calls are dropped or suffer from jitter and lag. These issues exist when users are using the Lync client or Lync Phone Edition. Humongous Insurance users currently are unable to IM with external clients that use different IM programs.
Currently there is no network oversight for Lync communications. The company has no plans to increase the bandwidth at any sites. Humongous Insurance does not have a defined remote user access policy.
The three offices are connected to one another as shown in the following network diagram:
Additional information about the existing environment is shown in the Supporting Information section:
– Overview of data centers
– Detail of the Chicago data center
– Overview of audio and video codec bandwidths
Employees of Humongous Insurance use various operating systems, including Windows XP, Windows Vista Enterprise, Windows 7 Enterprise, and Windows 8. All users are enabled for Enterprise Voice, and many have Lync Phone Edition.
The concurrent communication modalities usage of the three offices is shown in the following table:
Humongous Insurance expects to see the number of video users increase by as much as 10 percent. The company expects to see the number of voice users increase by as much as 15 percent.
All users at Humongous Insurance will be Lync enabled. The company uses synthetic transactions to perform call and voice tests. Many of the employees of Humongous Insurance work from home and sign in securely to the corporate environment in order to use Lync.
Humongous Insurance would like to review the existing network topology and wants to ensure that network capacity will meet current Lync 2013 infrastructure capacity requirements for audio and video usage, as well as meet the anticipated increases.
All existing issues relating to the poor quality of Lync calls and conferencing need to be addressed.
Company policy allows for all employees to have the option to use video conferencing. Employees will be limited to VGA video quality. Company executives will not have these limitations.
Quality of Service (QoS) ports must be unique for audio and video traffic. The company wants to confirm that the current network bandwidth allocated for the network is sufficient for all current and anticipated growth in Lync traffic and would like to guarantee high-quality Lync calls and video conferencing.
Humongous Insurance wants to ensure that the volume of Lync traffic does not exceed 50 percent of WAN bandwidth.
The recommended design solution needs to eliminate the possibility of WAN oversubscription by Lync traffic.
Humongous Insurance wants to use only dedicated computers to monitor the network and perform synthetic transactions to limit the load on the computers.
The proposed Lync 2013 solution needs to provide scalability to accommodate the company’s future acquisition of Trey Research.
The proposed Lync 2013 solution should be readily available for users in all three sites.
The company wants to allow only authorized employees to connect remotely. All remote users will use a secure method when remotely connecting to the network and the Lync environment.
The number of open and listening ports must be kept to a minimum. All maintenance and tests of network policies must be done outside of normal business hours.
Bandwidth between sites cannot be increased.
The quality of voice and video traffic must be increased.
The number of dropped calls must be reduced.
The corporate information technology (IT) department must be able to push updates and scan users’ computers when they are connected remotely.
All push notifications must be able to be sent mobile clients on all supported cell phone manufactures. Many users do not use Windows mobile phones. IM users must be able to IM with users who are using other IM programs. The Microsoft Lync 2013 Bandwidth Calculator must be used to analyze Lync traffic. It is recommended to deploy QoS for end-to-end support. Mobile client users are supported only with Lync 2010 Mobile clients.
You need to identify the current average amount of bandwidth required for public switched telephone network (PSTN) calls for all three sites.
Which bandwidth should you choose?
A. 16,800 Kbps
B. 23,250 Kbps
C. 36,375 Kbps
D. 61,725 Kbps
You need to recommend a solution to test instant messaging (IM) communications with the federated company.
Which synthetic transaction should you configure?
You need to recommend a course of action to improve the performance of Lync audio and video sessions.
What should you do?
A. Enable Quality of Service (QoS).
B. Deploy new wide area network (WAN) links between the Central Sites.
C. Enable Media Bypass.
D. Change the Differentiated Services Code Point (DSCP) values.
You need to configure the monitoring computers to support the deployment of watcher nodes to meet the technical requirements.
What should you do?
A. Deploy the Lync 2013 watcher nodes on the same computers as the Lync 2010 watcher nodes.
B. Deploy Lync 2013 watcher nodes and remove the Lync 2010 watcher nodes.
C. Run the Install-CsWatcherCollocate cmdlet on each computer that is running the Lync 2010
D. Run the Install-CsLegacyWatcherNode cmdlet on each computer that is running the Lync 2010
You need to recommend a solution that will improve voice quality for Lync clients.
What should you recommend?
A. Configure an Audio and Video Quality of Service (QoS) to use a DSCP value of 40 and a port range
B. Change the Voice8021p value to 46.
C. Configure a Domain Group Policy object (GPO) configuring Quality of Service (QoS) and set it to
Enforced for all Windows XP SP3 and Windows Vista clients.
D. Ensure that VoiceDiffservtag values are set to 46 for all Lync Phone Edition devices at all sites.
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