Exam Code: 74-335
Exam Name: Lync Network Readiness Assessment
You need to determine whether the poor quality of Lync calls is related to inadequate network bandwidth.
What should you do?
A. Enable Jumbo Frames on all network switches.
B. Calculate the current volume of Lync traffic in Litware, and then confirm that volume of Lync traffic does
not exceed 50 percent of wide area network (WAN) bandwidth.
C. Calculate the current volume of Lync traffic in Contoso, and then confirm that the volume of Lync traffic
does not exceed 25 percent of wide area network (WAN) bandwidth.
D. Disable Quality of Service (QoS) support on all network switches.
You need to recommend a design solution to upgrade the wide area network (WAN) link in the Vancouver office.
What should you do?
A. Implement a Frame Relay link.
B. Implement a Multiprotocol Label Switching (MPLS) link.
C. Implement a split-tunnel virtual private network (VPN).
D. Implement a WAN optimization solution.
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. packet loss
D. round trip
You need to identify the parameters that are required to estimate the future volume of Lync traffic in the Vancouver office.
Which two parameters should you choose?
(Each correct answer presents part of the solution. Choose two.)
A. 300 employees at Contoso, Ltd.
B. 80 employees at Litware, Inc.
C. 40 employees at Litware, Inc.
D. 35 hybrid users at Contoso, Ltd.
You need to define the goals that you would like to achieve after you perform usage modeling of Lync traffic in Contoso.
Which two goals should you establish?
(Each correct answer presents part of the solution. Choose two.)
A. Confirm that the volume of Lync traffic does not exceed 25 percent of wide area network (WAN) bandwidth.
B. Confirm that bandwidth is sufficient for Microsoft Office 365 Hybrid Lync deployment.
C. Confirm that the volume of Lync traffic does not exceed 5 megabits per second (Mbps).
D. Confirm that bandwidth is sufficient for 40 new Litware, Inc. Lync users.
E. Confirm that bandwidth is sufficient for 80 new Litware, Inc. Lync users.
C: From scenario:
Contoso also plans to acquire a small law firm in Vancouver called Litware, Inc., which has 80 employees. Litware currently uses a 10-megabit per second (Mbps) Internet connection. Half of Litware employees will use Lync services. All Lync-enabled users in Litware will use Instant Messaging only. Currently, Instant Messaging concurrent usage at Litware is 50 percent during peak hours.
You need to adjust modalities to define the custom usage model for Litware Inc by using the Lync Bandwidth Calculator.
How should you set the modalities in the Lync Bandwidth Calculator?
(To answer, select the appropriate value in each drop-down menu in the Lync Bandwidth Calculator.)
You need to define branch sites in the Lync Bandwidth Calculator to estimate the volume of Lync traffic.
Which branch sites should you select?
(To answer, select the appropriate branch site or sites in the Lync Bandwidth Calculator.)
Drag and Drop Question
You are developing a design solution to eliminate the possibility of wide area network (WAN) oversubscription by Lync traffic.
You need to assign tasks to each office.
Which tasks should you assign to each office?
(To answer, drag the appropriate task or tasks to the correct office or offices in the answer area. Each task may be used once, more than once, or not at all. You may need to drag the split bar between panels or scroll to view content.)
You need to use the Lync Bandwidth Calculator to create a new persona definition for Litware, Inc.
Which options should you select?
(To answer, select the appropriate option in each drop-down menu in the Lync Bandwidth Calculator.)
Case Study 4 – Fabrikam Inc. (Question 40 – Questions 50)
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).
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 re mote/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 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.
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.
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 a wireless LAN controller (WLC) management strategy for Fabrikam, Inc. that uses the least administrative effort.
Which management strategy should you recommend?
A. centralized management
B. access layer management
C. distribution management
D. independent management
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