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Microsoft Network Readiness and Assessment for Lync Sample Questions:

1. ======================================
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.)

2. HOTSPOT
The customer's network topology is shown in the Network Topology exhibit. (Click the Exhibit button.)

Bandwidth utilization results for the sites are shown in the exhibits as follows:
Central sites (Click the Exhibit button.)
Branch sites (Click the Exhibit button.)


You need to identify the link that may cause issues during conferencing.
Which link shown on the network topology diagram should your customer monitor? (To answer, select the appropriate link on the network topology diagram.)

3. You are implementing Microsoft Lync for Mobile and you need to limit and control rogue access point (AP) exposure to protect the organization.
Which technology should you implement?

A) firewall
B) 802.1X
C) Wi-Fi Protected Access version 2 (WPA2)
D) wireless intrusion prevention system (WIPS)

4. Your customer's network includes four offices and a data center that are connected by a Multiprotocol Label Switching (MPLS) network.
Your customer has performed a network readiness assessment. The readiness report includes the following sections:
---
Existing network topology Historical wide area network (WAN) links bandwidth utilization Bandwidth estimations
Users and locations
You are asked to review the readiness report.
You need to identify which sections are missing from the readiness report and should be included.
Which two sections should you include? (Each correct answer presents part of the solution. Choose two.)

A) Discovery
B) Traffic simu-lation
C) Modeling
D) Recommendations

5. Fourth Coffee has deployed a Lync 2013 infrastructure. Company employees and guests joining from outside of the company do not report any issues with shared media. The company reports, however, that visiting consultants experience poor audio quality when they conduct peer-to-peer (P2P) audio sessions with Fourth Coffee employees who are located in the same office.
A section of the call data report (CDR) in represented in the following table:

You need to identify the root cause of poor audio quality. Which value should you choose?

A) Applied bandwidth limit: 81 Kbps
B) Avg. round trip: 434 ms
C) Lower burst gap duration
D) Callee IP: 69.87.59.241

Solutions: