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

QUESTION 21
You need to recommend a solution to meet the planned changes for remote users.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

A.    Configure internal Domain Name System (DNS) to point to the external IPv4 address for Lync
Edge Services.
B.    Configure Direct Access on CHI-Edge1.
C.    Configure Direct Access to send Domain Name System (DNS) queries for the access, webconf,
av, _sip._tls, and meeting URLs and all other Lync services to external DNS.
D.    Limit service to selected IP addresses in the Topology Builder.

Answer: AD

Explanation:
D: DirectAccess, Its Microsoft new Remote connectivity solution where users on the Internet get Intranet connectivity to their corporate network without installing any client or initiating any software like old traditional VPN. Microsoft DirectAccess is purely based on IPV6 and Lync 2013 is fully supporting IPV6 and Lync 2013 clients using DirectAccess should work without any problem. If any one encountered problems making Lync calls or connecting to Lync on a DirectAccess Computer then you need to ensure that IPV6 is enabled on the Lync 2013 Server as per the below image.

This can be achieved as follows:
Open the Lync 2013 Topology Builder from an old file or download the topology Edit the properties of the Lync server and in the General Properties ensure that IPV6 is enabled.
These settings need to be published from the Action Menu – Topology – Publish Now you can enjoy Lync 2013 over DirectAccess Connection.
* From scenario:
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.

QUESTION 22
You need to identify the current maximum bandwidth required for peer-to-peer (P2P) video calls to match business requirements.
Which bandwidth should you choose?

A.    303,750 Kbps
B.    310,960 Kbps
C.    759,760 Kbps
D.    1,503,750 Kbps

Answer: B

QUESTION 23
You need to configure the Lync 2013 environment to meet the technical requirements for push notifications for mobile users.
Which two actions should you perform?
(Each correct answer presents part of the solution. Choose two.)

A.    Configure a web publishing rule for port 80 on the reverse proxy for the acquired domain.
B.    Configure CNAME redirection over HTTPS for the acquired domain.
C.    open port 5223 on the Enterprise Wi-Fi network.
D.    Open port 23457 on the Enterprise Wi-Fi network.

Answer: BC
Explanation:
B: To support mobile users from both inside and outside the corporate network, your internal and external web FQDNs must meet some prerequisites. In addition, you may need to meet other requirements, depending on the features you choose to implement:
New DNS, CNAME or A (host, if IPv6, AAAA) records, for automatic discovery.
New firewall rule, if you want to support push notifications through your Wi-Fi network. Subject alternative names on internal server certificates and reverse proxy certificates, for automatic discovery.
Front End Server hardware load balancer configuration changes source affinity.
C: If you support push notifications and want Apple mobile devices to receive push notifications over your Wi-Fi network, you also need to open port 5223 on your enterprise Wi-Fi network. Port 5223 is an outbound TCP port used by the Apple Push Notification Service (APNS).
From scenario: 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.

QUESTION 24
You need to deploy and enable Quality of Service (QoS) on all workstations to meet the planned changes and performance goals.
Which three actions should you perform?
(Each correct answer presents part of the solution. Choose three.)

A.    Apply Service Pack 3 to all Windows XP workstations and Service Pack 2 to all Windows Vista
workstations.
B.    Create Group Policy objects (GPOs) for Lync audio and video and configure them to use the same
port ranges and Differentiated Services Code Point (DSCP) values for QoS.
C.    Create Group Policy objects (GPOs) for Lync audio and video and configure them to use different
port ranges and Differentiated Services Code Point (DSCP) values for QoS.
D.    Configure the Group Policy object (GPO) configuring QoS and set it to Enforced.
E.    Upgrade all Windows XP and Windows Vista workstations to Windows 7 or above.

Answer: BDE
Explanation:
E (not A): Note that Microsoft Lync Server 2013 does not support QoS for other Windows operating systems, such as Windows Vista or Windows XP.
B (see step 6, step 7 below):
To create a Quality of Service audio policy for Windows 7 or Windows 8 computers, first log on to a computer where Group Policy Management has been installed. Open Group Policy Management (click Start, point to Administrative Tools, and then click Group Policy Management) and then complete the following procedure:
In Group Policy Management, locate the container where the new policy should be created. For example, if all your client computers are located in an OU named Clients then the new policy should be created in the Client OU. Right-click the appropriate container and then click Create a GPO in this domain, and Link it here.
In the New GPO dialog box, type a name for the new Group Policy object in the Name box (for example, Lync Audio) and then click OK. Right-click the newly-created policy and then click Edit. In the Group Policy Management Editor, expand Computer Configuration, expand Policies, expand Windows Settings, right-click Policy-based QoS, and then click Create new policy.
In the Policy-based QoS dialog box, on the opening page, type a name for the new policy (e.g., Lync Audio) in the Name box. Select Specify DSCP Value and set the value to 46. Leave Specify Outbound Throttle Rate unselected, and then click Next.
On the next page, make sure that All applications is selected and then click Next. This setting instructs the network to look for all packets with a DSCP marking of 46, not just packets created by a specific application.
Etc.

QUESTION 25
You need to identify the current average amount of bandwidth required for peer-to-peer (P2P) voice calls for all three sites.
Which bandwidth should you choose?

A.    36,960 Kbps
B.    51,150 Kbps
C.    80,025 Kbps
D.    135,795 Kbps

Answer: B

QUESTION 26
Drag and Drop Question
You need to prepare the Quality of Service (QoS) policy for the audio/video (A/V) Edge Servers in order to meet the technical requirements of Humongous Insurance.
Which values should you use for each configuration?
(To answer, drag the appropriate value or values to the correct configuration or configurations in the answer area. Each value 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.)

Answer:

QUESTION 27
You need to recommend a solution to test users’ ability to schedule, join, and conduct an audio/video (A/V) conference. What should you do?

A.    Run the Test-CsMcxConference synthetic transaction, save the results, and then view the results
through the Lync Server Logging Tool.
B.    Run the Test-CsAVConference synthetic transaction and then analyze the trace call flow in Snooper.
C.    Run the Test-CsUcwaConference synthetic transaction.
D.    Run the Test-CsAudioConferencingProvider synthetic transaction, save the results, and then view
the results through the Central Logging Service.

Answer: C

Case Study 3 – Contoso Ltd (Question 28 – Questions 39)
Background
Contoso, Ltd. is a Canadian business law firm that currently employs 300 people. Contoso operates a main office in Vancouver that houses 250 employees and a branch office in Seattle that houses 50 employees. All Contoso users are Lync-enabled.

Contoso plans to introduce a remote disaster recovery data center to host remote replicas of key services, including Active Directory, Lync, Exchange, and files and legal software, Contoso is launching a hybrid configuration of Office 365 to validate the cloud-based Exchange Online service.

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.

There is a possibility that Contoso will make two more acquisitions during the next three years.
Vancouver and Seattle employees have submitted support tickets to report poor quality of outbound Lync calls to external users. A user activity report collected by the help desk department is shown in the User Activity Report section.

There is a concern that in the future, the volume of Lync traffic may reach up to 50 percent of the current bandwidth available in the Vancouver office.

User Activity Report

Existing Environment
The core portion of the infrastructure is located in the Vancouver data center, although the Seattle data center also has two servers (listed below) to provide redundancy of Active Directory and data services.
The following services and applications comprise Contoso’s infrastructure in Vancouver and Seattle:

Vancouver Data Center

Seattle Data Center

An overview of the network infrastructure of Vancouver and Seattle data centers is shown in the exhibit. (Click the Exhibit button.)

All users in the Vancouver and Seattle offices use the Microsoft Windows 8 Enterprise operating system and Lync phones that are enabled for Enterprise voice. Contoso expects to see a growing number of remote users. They anticipate that up to 20 percent of users in Vancouver might work remotely.

Contoso has defined a team of 35 users who will participate in a pilot deployment of the Office 365 hybrid configuration.

The offices in Vancouver and Seattle are using 5-Mbps Internet connections. Contoso has a site-to-site VPN between the Vancouver office and the Seattle office. All external outbound calls from the Vancouver and Seattle offices are routed outside through the office in Vancouver.

Business Requirements
Contoso needs to review the existing network topology as well as the Lync 2013 infrastructure to ensure that network capacity is sufficient to accommodate the Litware, Inc.
Lync users in the future.

Contoso expects to see up to 85 percent of simultaneous instant messaging and 25 percent of public switched telephone network (PSTN) calls during business hours. All existing issues that relate to poor quality of outbound Lync calls need to be addressed as well.

Contoso wants to ensure the following:

– Current network bandwidth allocated to the Vancouver office is sufficient to sustain the future volume of Lync traffic and guarantee high quality of Lync calls.
– Volume of Lync traffic does not exceed 25 percent of the WAN bandwidth.

Contoso plans to redesign the existing site-to-site VPN solution between the Vancouver and Seattle offices to implement a robust and reliable WAN solution with end-to-end support of Quality of Service (QoS).

The recommended design solution needs to eliminate the possibility of WAN oversubscription by Lync traffic.

The proposed Lync 2013 solution needs to be:

– Scalable to accommodate the company’s future acquisitions.
– Readily available for Vancouver and Seattle users.

In case of a disaster, a manual switchover of Lync services to the disaster recovery datacenter should be available.

Technical Requirements
All Session Initiation Protocol traffic (SIP) traffic must be encrypted.
All external Lync 2013 services must be protected by a firewall.
A commercial third-party certificate must be used on the external interface of Lync 2013 Edge servers.

The Role-Based Access Control (RBAC) model will be implemented to delegate basic administrative tasks to the Lync help desk team. All maintenance of Lync servers must be performed outside of business hours. The proposed architecture solution must support interoperability between Lync 2013 and Exchange 2013.

The Microsoft Lync 2013 Bandwidth Calculator must be used to analyze Lync traffic. The QoS end-to-end support needs to be implemented.

QUESTION 28
Hotspot Question
You need to modify the relevant portion of the Persona configuration in the Lync Bandwidth Calculator to estimate the planned volume of Lync traffic for the Contoso office in Vancouver.
Which options should you select?
(To answer, select the appropriate value in each drop- down menu in the Lync Bandwidth Calculator.)

Answer:

QUESTION 29
You need to determine which connection will be most affected by the Office 365 users.
Which two connections should you select? (Each correct answer presents part of the solution. Choose two.)

A.    The internet connection at the Vancouver office.
B.    The site-to-site virtual private network (VPN) between the Vancouver and Seattle offices.
C.    The PSTN connection at the Vancouver office.
D.    The internet connection at the Seattle office.
E.    The PSTN connection at the Seattle office.

Answer: AB
Explanation:
* From scenario:
/ Contoso is launching a hybrid configuration of Office 365 to validate the cloud-based Exchange Online service.
/ Contoso has defined a team of 35 users who will participate in a pilot deployment of the Office 365 hybrid configuration.
/ The Exchange 2013 Servers are placed in Vancouver

QUESTION 30
You need to configure the Lync 2013 Bandwidth Calculator to provide a visual alert when the volume of Lync traffic at Contoso exceeds the maximum allowed threshold.
What should you do?

A.    For the Contoso office in Vancouver, update the value for WAN link BW allocated for RTC traffic
to 5 Mbps.
B.    In the global definitions, update the value of the Flag in Red parameter to 50%.
C.    For the Contoso office in Seattle, update the value for WAN link BW allocated for RTC traffic to 5 Mbps.
D.    In the global definitions, update the value of the Flag in Red parameter to 25%.

Answer: D

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