Microsoft Lync Server 74-335

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Microsoft Network Readiness and Assessment for Lync Sample Questions:

1. ==========================================
Topic 1, Humongous Insurance
Background
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.
Planned Changes
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.
Challenges
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.
Existing Environment
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.
Business Requirements
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.
Technical Requirements
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) 36,375 Kbps
B) 23,250 Kbps
C) 16,800 Kbps
D) 61,725 Kbps

2. 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 Lync 2013 watcher nodes and remove the Lync 2010 watcher nodes.
B) Run the Install-CsLegacyWatcherNode cmdlet on each computer that is running the Lync 2010 watcher nodes.
C) Run the Install-CsWatcherCollocate cmdlet on each computer that is running the Lync 2010 watcher nodes.
D) Deploy the Lync 2013 watcher nodes on the same computers as the Lync 2010 watcher nodes.

3. You need to identify the metric that is causing poor quality in Lync calls by analyzing the user activity report collected by the help desk department.
Which metric should you choose?

A) burst gap duration
B) round trip
C) jitter
D) packet loss

4. ======================================
Topic 2, A Datum Corporation
Background
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 simul-ation
------
The initial Lync traffic simul-ation has been completed for the following locations:
Boston
Detroit
Chicago
Montreal
Quebec
Toronto data center
A_. Datum Corporation wants to design and perform an additional Lync traffic simul-ation for all other offices. The additional simul-ation 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 simul-ation. The output is shown in the Quebec Traffic simul-ation 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 simul-ation. The target computer is located in the data center. The output is shown in the Montreal Traffic simul-ation Output exhibit. (Click the Exhibit button.)

The table below shows peak traffic delays between several offices during the initial Lync traffic simul-ation.

A portion of the initial Lync traffic simul-ation summary is shown in the table below. The table compares estimated (modeled) and simulated real-time communications (RTC) traffic over WAN links.

======================================
HOTSPOT
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.)

5. ===============================
Topic 4, Fabrikam Inc.
Background
Fabrikam, Inc. is a worldwide leader in production and sales of cameras, lenses, flashes, and photography accessories. The company employs 6,500 people worldwide.
The company has its main office in Tokyo; three data centers in Tokyo, New York, and Prague; ten manufacturing units across China; and branch offices in 20 other cities. The network diagram for Fabrikam, Inc. is shown in the exhibit. (Click the Exhibit button.)

For the pilot project, a Front End Server and an Edge Server will be located at the New
York data center. Test users will be located in the Tokyo main office and outside the
Fabrikam network over a public Internet connection.
The company plans to replace the existing traditional non-standard analog Private Branch
Exchange (PBX) implementations with a modern collaboration and telephony solution. This
modernization should allow employees to collaborate efficiently and reduce the company's
phone bills at the same time.
A proposal was made to accomplish this by testing and implementing a Microsoft Lync
2013 infrastructure.
For cost effectiveness, the company wants to utilize the existing network infrastructure
when implementing the Lync 2013 infrastructure.
The company needs to make sure the existing network infrastructure is ready for Lync
2013 implementation by analyzing:
Wide area network (WAN) infrastructure,
Wi-Fi infrastructure, and
Quality of Service (QoS) approaches.
During analysis, rogue access points (APs) were detected, so management wants to
secure the Fabrikam, Inc. wireless network infrastructure.
The company wants to design and implement a wireless local area network controller
(WLC) to minimize operational complexity and support.
---
---
During the test phase of implementation, Lync Phone Edition device users are experiencing voice degradation when they use audio with other Lync users, There are no reports of any problems between Lync phone communications.
Upper management is very concerned about ensuring security over a public network. The recommended solution should use secured protocols such as Transport Layer Security (TLS), Mutual Transport Layer Security (MTLS), or secure real-time transport protocol (SRTP).
Existing Environment
The company's existing environment includes:
a domain controller,
a Microsoft Exchange 2013 infrastructure server, and
a Microsoft SharePoint 2013 server.
The existing analog PBX telephony has reached its capacity in most locations.
Currently the company has a mix of Multiprotocol Label Switching (MPLS) Layer-3 network
and Internet Protocol security (IPSec) using an Asymmetric Digital Subscriber Line (ADSL)
between their locations, a remote VPN network for remote/on-field employees, and Wi-Fi
point-to-point links between buildings within the same locations, as well as internal Wi-Fi
access points. QoS is enabled globally for all WAN and LAN connections. Corporate
firewalls are installed at all locations.
At the Fabrikam, Inc. main office, there are three wireless access points (WAPs) deployed
with no Remote Authentication Dial-In User Service (RADIUS)/AAA. All of them are
configured for channels 2 or 7 with the same Service Set Identifier (SSID) and Wi-Fi
Protected Access-Pre-Shared Key (WPA-PSK).
Users at the main office use the wireless infrastructure, and as users roam they do not
switch over to different WAPs but stay associated with the original WAP until the signal is
completely gone. Then the wireless signal associates with the closest WAP.
For Lync Phone edition devices, QoS is set to its default.
The company's network platforms support only four queues with QoS-based admission.
The company uses traffic shaping and traffic policing.
Business Requirements
Employees travel between sites and require stable and reliable collaboration and phone solutions. The company wants to reduce investment in telecommunications, overseas calling, roaming, and conference call charges. Branches should be able to support up to 24 simultaneous peer-to-peer (P2P) calls between sites.
Employees should be able to call any phone number at any time, be visible, and be able to chat and use audio conferencing.
The company plans to deploy wireless LAN controllers (WLCs) for wireless management and monitoring, and wants to deploy Wireless IP phones in the main office. The company wants to map the Differentiated Services Code Point (DSCP) markings to industry best practices for all media types.
The proposed solution:
- must operate effectively for the entire company, including all locations and remote users, - must be reliable and recoverable in case of network or other problems affecting
any site,
- should offer rapid deployment,
- should be scalable, and
- should consolidate chat, phone, and email.
Technical Requirements
All Session Initiation Protocol (SIP) signaling and media traffic must be encrypted. The company wants integrated security within phones and servers, and Wi-Fi secured communications for WPA/WPA2. The new system should be highly available and should remain fully functional if any one server fails.
The proposed solution must be compatible with most known video and audio device manufacturers. The audio codec bandwidth is shown in the following table:

Fabrikam uses RTAudio Wideband. Call Admission Control (CAC) is disabled for VPN users. The company's existing network supports MPLS, IPSec VPN, and Remote VPN networks. WAP Infrastructure and WLC placement must be cost effective, with capacity management allowing high availability. QoS is currently deployed with non-standard setting for DSCP marking on the TCP/IP packets. Voice over IP (VoIP) requires service guarantees regardless of network conditions.
===============================
You need to recommend channel distribution to resolve the voice over wireless local area network (WLAN) interference problem.
Which channel distribution should you recommend?

A) Use a single-channel solution.
B) Use channels 2, 5, and 10.
C) Use a four-channel solution.
D) Use channels 1, 6, and 11.

Solutions: