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Question 5: Topic 1, A.Datum CorporationCompany Overview
A. Datum Corporation is a market research company that has 6,000 employees.
Physical Location
The company has a main office and two branch offices. The main office is located in Seattle. The branch
offices are located in Detroit and New York. The main office has 5,000 users. The Detroit office has 900
users. The New York office has 100 users.
Remote users frequently work from locations that only allow Internet access over ports 80 and 443. The
remote users frequently work from client computers that are not joined to the domain.
Existing Environment
Network Infrastructure
The network has the following servers:
An enterprise certification authority (CA)
A DHCP server has that the following DHCP options:
o 003 Router
o 006 DNS Servers
o 015 DNS Domain Name
A Network Time Protocol (NTP) server that is configured to use the User Datagram Protocol
(UDP)
A server in the main office that runs Microsoft Office Communications Server 2007
The network has the following configurations:
All client computers run Microsoft Office Communicator 2007.
AH Internet-accessible servers are located in a perimeter network.
Microsoft Forefront Threat Management Gateway (TMG) is used to publish internal Web sites for
customers.
All servers that have Office Communications Server installed run Windows Server 2003 Service
Pack 2 (SP2).
Telephony Infrastructure
Telephony Infrastructure
The telephony infrastructure is configured as shown in the exhibit. (Click the Case Study Exhibits button.)
Requirements
Business Goals
A. Datum has the following business goals:
Minimize software costs.
Minimize hardware costs.
Minimize the amount of administrative effort required to deploy new technology solutions.
Planned Changes
A. Datum plans to migrate to Lync Server 2010 and implement the following changes:
Enable Enterprise Voice for all internal users and remote users.
In the main office, deploy devices that run Microsoft Lync 2010 Phone Edition.
Enable IM, presence, and conferencing with a federated partner company named Contoso, Ltd.
Create a Lync site for each office.
Add the primary data center and the secondary data center to the Seattle Lync site.
Technical Requirements
A. Datum must meet the following technical requirements:
The number of public IP addresses must be minimized.
The main office must support 1,000 concurrent PSTN calls.
Lync services must be available to remote users over TCP port 443.
Remote users must be able to participate in conferences and make Enterprise Voice calls.
Telephony Requirements
The telephony infrastructure must meet the requirements shown in the following table.
Each office will contain users who are assigned the Manager role and the Employees role.
Security Requirements
A. Datum must meet the following security requirements:
Federation must only be allowed with Contoso.
Lync-related traffic must not be routed over VPN connections
Availability Requirements
If a data center fails, all users in the main office must be able to perform the following tasks
Create a conference.
Place calls to the PSTN.
View the presence status of all users in the Seattle office.
If a WAN link fails, users in the Detroit office must be able to perform the following tasks:
Create a conference.
Place calls to the PSTN.
View the presence status of all users in the Detroit office.
Reference Data
The typical bandwidth utilization for various codecs is listed in the following table.
A T1 interface supports 23 concurrent calls
1.You are evaluating the use of standard gateway devices that support eight T1 interfaces each. The
gateways do not support media bypass.
You need to recommend a solution to support PSTN calls from the main office. The solution must meet
the company technical requirements. What should you include in the recommendation?
A. Deploy four gateways and a single Mediation pool that contains two servers.
B. Deploy six gateways and a single Mediation pool that contains six servers.
C. Deploy four gateways and two Mediation pools that each contains a single server.
D. Deploy six gateways and a single Mediation pool that contains two servers.
Correct Answer: D
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