HP Advanced Services zl Module with Microsoft® Windows Server® 2008 R2 Planning and Design Guide

4-3
Solution 3: Survivable Communications
Solution Components
The server running on this module can also provide other services to decrease
WAN link traffic and enhance branch survivability. In this solution, the HP
Advanced Services zl Module with Microsoft Windows Server 2008 R2 will
provide the following Windows services locally:
 Domain Name System (DNS)—The server will act as a DNS server providing
services at the local level and significantly reducing the number of DNS
requests sent through the WAN link. In the event of a WAN outage, the
SBM can contact this DNS server, ensuring that it continues to support
communication services.
 Active Directory—The server running on the module will act as a domain
controller for the local users, allowing the users to log in to the domain
and implementing the domain policies.
 Dynamic Host Configuration Protocol (DHCP)—Most endpoints must receive
their IP settings using DHCP. Providing DHCP at the branch level protects
these endpoints’ network connectivity in the case of a WAN failure.
Keeping DHCP requests local might also eliminate some bursts of traffic
(as users arrive at the office, start up their computers, and request DHCP
settings).
 Internet Information Services (IIS)—The module will host some Web appli-
cations locally.
 Print Services—The module will act as a print server, managing and
monitoring print queues to increase printing efficiency.
 File Services—While branch users need to access some centralized
resources, many of the files that they access most often are specific to the
local branch. The module can store such files, delivering them to autho-
rized local users as needed.
The server that is running on module can also host any other applications that
you choose such as antivirus or firewall software. Follow the guidelines given
by the application for deploying it.
Solution Components
Figure 4-2 illustrates a solution for survivable branch communications and
other network services.