Explanation/Reference:
Section: Enterprise Network Design Explanation
Explanation:
You would expect to find a Dynamic Host Configuration Protocol (DHCP) server in the data center module or enterprise edge module of the Cisco enterprise architecture. The enterprise architecture model is a modular framework that is used for the design and implementation of large networks. The enterprise architecture model includes the following modules: enterprise campus, enterprise edge, service provider (SP) edge, and remote modules that utilize resources that are located away from the main enterprise campus.
The campus core layer, building distribution layer, and building access layer are all part of the enterprise campus module. These submodules of the enterprise campus module rely on a resilient multilayer design to support the day-to-day operations of the enterprise. Also found within the enterprise campus module is the data center submodule, which is also referred to as the server farm submodule. The data center submodule provides file and print services to the enterprise campus. In addition, the data center submodule typically hosts internal Domain Name System (DNS), email, DHCP, and database services.
The enterprise edge module represents the boundary between the enterprise campus module and the outside world. In addition, the enterprise edge module aggregates voice, video, and data traffic to ensure a particular level of Quality of Service (QoS) between the enterprise campus and external users located in remote submodules. Enterprise WAN, Internet connectivity, ecommerce servers, and remote access & virtual private network (VPN) are all submodules of the enterprise edge module.
Enterprise data center, enterprise branch, and teleworkers are examples of remote submodules that are found within the enterprise architecture model. These submodules represent enterprise resources that are located outside the main enterprise campus. These submodules typically connect to the enterprise campus through the use of the SP edge and enterprise edge modules. Because many Cisco routers commonly used at the edge of the network are capable of providing DHCP and DNS services to the network edge, devices in the remote submodules do not need to rely on the DHCP and DNS servers located in the enterprise campus.
The SP edge module consists of submodules that represent third-party network service providers. For example, most enterprise entities rely on Internet service providers (ISPs) for Internet connectivity and on public switched telephone network (PSTN) providers for telephone service. In addition, the third-party infrastructure found in the SP edge is often used to provide connectivity between the enterprise campus and remote resources.
Reference:
CCDA 200-310 Official Cert Guide, Chapter 8, DNS, pp. 319-321