Vendor: Microsoft
Exam Code: 74-335
Exam Name: Lync Network Readiness Assessment
Version: 14.79

QUESTION 71
Hotspot Question
You are evaluating Lync traffic modeling results for your customer.
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.)

Answer:

QUESTION 72
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.    Recommendations
C.    Traffic simu-lation
D.    Modeling

Answer: BD

QUESTION 73
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.    Lower burst gap duration
C.    Avg. round trip: 434 ms
D.    Callee IP: 69.87.59.241

Answer: D

QUESTION 74
You perform a network readiness assessment for Lync deployment for a customer’s organization.
The customer’s organization includes five sites that are connected by site-to-site virtual private network (VPN) links. Each site includes 20 to 100 client computers.
You want to prepare a Lync traffic simu-lation.
You need to select the network traffic characteristics to collect.
Which three network traffic characteristics should you select?
(Each correct answer presents part of the solution. Choose three.)

A.    TCP/IP port statistics
B.    average packet loss
C.    one-way network delay
D.    minimum jitter
E.    average jitter
F.    peer-to-peer (P2P) available bandwidth

Answer: BCE
Explanation:
Your simu-lation testing should use five baseline network characteristics that will quantify your network’s performance under the anticipated traffic volume that your users will generate by using Lync Server.
A simu-lation tool must be able to generate traffic (real RTP/RTCP traffic), collect, and then graph the variation in the five baseline network characteristics for each call:
One-way network delay (C)
Average jitter(E)
Maximum jitter
Average packet loss (B)
Burst packet loss (peak consecutive packets lost)

QUESTION 75
Your company’s 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 6,500 users enabled for Lync 2013 video conferencing.
Only RTVideo is being used for video conferencing. On average, 12 percent of users are on a video conference at any one time. The company plans to add additional bandwidth for all sites.
The company is concerned about the quality of video conferences.
As part of a bandwidth upgrade process, you model real-time transport protocol (RTP) media call flows for video communications that use only RTVideo.
You have determined the average number of video conferences and estimated the bandwidth required for the video portion.
You need to identify the additional bandwidth requirements when modeling real-time transport control protocol (RTCP).
Which bandwidth option should you choose?

A.    10 kilobits per second (kbps) per stream
B.    15 kilobits per second (kbps) per stream
C.    10 kilobits per second (kbps) total
D.    30 kilobits per second (kbps) total

Answer: A

QUESTION 76
You prepare to deliver a network assessment for a customer. The customer has four sites as described in the following table:

The results of the traffic simu-lation for Seattle to Hong Kong are shown in the following table:

You need to analyze the data and provide the General Comments for the traffic simu-lation results. What should you recommend?

A.    The average delay is beyond acceptable levels. Users might experience poor call quality.
B.    The network performance tests indicate the link is ready for voice.
C.    The packet loss is above 0.5%. Audio quality will be greatly reduced.
D.    The percentage of WAN BW for RTC Traffic is greater than 100%, and users will experience poor
calls due to limited bandwidth.

Answer: A

QUESTION 77
Your company corporate telephony environment is a combination of Lync 2013 and traditional Private Branch Exchange (PBX). The company has 3,500 users at three sites that are connected by a Multiprotocol Label Switching (MPLS) topology. On average, the company has 10 percent of its users in conferences and 15 percent on a public switched telephone network (PSTN) call at any time. The company is planning to deploy Wi-Fi solutions for all offices and move all Lync communications through the wireless network.
You are concerned about the quality of voice traffic through the wireless network.
You plan to generate and collect simulated traffic through the wireless network to determine if the traffic is affected by going through the wireless network.
You need to determine if there is any degradation of service through the simulated traffic on the wireless network.
Which piece of information should you generate and collect?

A.    Wi-Fi Multimedia Call Data Record (WMM CDR)
B.    Wi-Fi Multimedia Quality of Experience (WMM QoE)
C.    Wi-Fi Multimedia Power Save
D.    Wi-Fi Multimedia Quality of Service (WMM QoS)

Answer: D

QUESTION 78
You perform a network readiness assessment for Lync deployment.
The organization’s network includes a head office and 400 branch offices. All branch offices are connected to the head office with a Multiprotocol Label Switching (MPLS) link.
You have completed the traffic simu-lation. The Usage Modeling Data for the Beijing site is shown in the following table:

A summary of the simu-lation results is shown in the table below:

Detailed simu-lation results are shown in the following exhibits:

– One Way Network Delay {Click the Exhibit button.)

– Average Jitter (Click the Exhibit button.)

– Maximum Jitter (Click the Exhibit button.)

– Average Packet Loss (Click the Exhibit button.)

– Maximum Consecutive Loss (Click the Exhibit button.)

You need to provide recommendations based on the simu-lation results.
What should you recommend?

A.    Implement Call Admission Control (CAC) on Lync for the affected sites.
B.    Restrict video capability or reduce quality codec usage for certain user groups.
C.    Increase WAN link bandwidth.
D.    Monitor Quality of Experience (QoE).

Answer: C

QUESTION 79
You perform a network readiness assessment for Lync deployment.
The network includes a main office and 40 branch offices. The main office and 30 of the branch offices are located in North America and use a dedicated 20-megabits per second (Mbps) Multiprotocol Label Switching (MPLS) link.
The remaining 10 branch offices are located in India and are connected to the main office by a virtual private network (VPN) site-to-site link.
Each branch office includes 100 clients and two multipurpose servers.
Employees from the branch offices will use the Lync client for peer-to-peer audio communications with employees at the main office.
You need to identify the number of offices required to test Lync readiness.
What is the minimum number of offices you should include?

A.    2
B.    3
C.    40
D.    41

Answer: B

QUESTION 80
You perform a network readiness assessment for a Lync deployment and model Lync network traffic by using the Lync Bandwidth Calculator.
The organization plans to use panoramic video conference calls.
You need to build a report to determine if the existing wide area network (WAN) links’ bandwidth is sufficient to handle panoramic video conference call traffic.
What should you do?

A.    In the Codecs tab, customize the parameters for Lync 2013 multiview utilization.
B.    Create a custom threshold definition.
C.    Create custom calculations based on peer-to-peer (P2P) and conference traffic estimations.
D.    In the Definitions tab, customize the resolution parameter for application sharing.

Answer: C

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