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Contoso deployed Lytic Front End pools in Redmond and in London. The Redmond pool services 15,000 users and the London pool services 5,000 users. All users should be enabled for Instant Messaging and Conferencing. How should an administrator design the conferencing server topology to meet conferencing requirements and comply with Microsoft recommendations?

• A. Deploy an A/V Conferencing pool in Redmond. Configure the London pool to use the built in conferencing capabilities of the Front End Servers.
• B. Configure the London and Redmond pools to use the built in conferencing capabilities of the Front End Servers.
• C. Deploy an A/V Conferencing pool in Redmond. Configure the Front End pools in Redmond and London to use this A/V Conferencing pool.
• D. Deploy A/V Conferencing pools in Redmond and London.

Refer to the exhibit.

Contoso plans to deploy video conferencing within a central site and four branch offices using HD webcarns. Each branch office has 50 users. Contoso expects 10% of the users to have simultaneous video sessions with the central site. The MaxVideoConferenceResolution parameter
value is set to VGA. How much bandwidth capacity must the administrator provision between a single branch office and the central site for the video sessions for that site?

• A. 3050 Kbps
• B. 1100 Kbps
• C. 1300 Kbps
• D. 2540 Kbps

Refer to the exhibit.

An organization is using Lync Enterprise Voice to make and receive external PSTN calls to and from the Lync client. The exhibit displays a typical call flow experienced for outgoing PSTN" calls for the organization The Lync infrastructure is connected to a PBX that is qualified with Lync Server 2010, but does not support Media Bypass. Which two CODECs can be used on the Lync client given the media path displayed in the exhibit? (Choose two.)

• A. G.711
• B. G.729
• C. Siren
• D. RTAudio Wide Band
• E. RTAudio Narrow Band

An organization runs Microsoft Lync Server 2010 and all users are enabled for Enterprise Voice. Exchange Server 2010 Unified Messaging (UM) is deployed to provide voice mail functionality to the end user. All users in the organization use the Lync 2010 client and Outlook 2010. A user calls voicemail from the Lync Client and the attempt is unsuccessful. The Exchange server log contains the error message: "The Unified Messaging server failed to exchange the required certificates with an EP gateway to enable Transport Layer Security (TLS) for an incoming call." Which action solves this problem?

• A. Replace the certificate of the IP gateway.
• B. Import the trusted certificate root chain to the Lync Client
• C. Replace the Exchange Server Certificate.
• D. Re-run the Exchange UM Integration utility OcsUmUtil.exe on the Lync Front End server.

An administrator is deploying a Formal Response Group for the IT Helpdesk department. Some of the agents in the Response Group report that they are unable to receive calls, while others can. The members of the Response Group have different Active Directory (AD) group memberships and Privacy Mode configurations. How can an administrator ensure that the agents receive calls?

• A. Create a unique AD Helpdesk Group, place all agents in it, and change the Response Group type to Informal.
• B. Search for the RGS Presence Watcher Contacts and remove them from their Contact List.
• C. Search for the RGS Presence Watcher Contacts and add them to their Contact List.
• D. Create a unique AD Helpdesk Group, place all agents in it, and turn on Privacy Mode for all of them.