Explanation/Reference:
Section: Considerations for Expanding an Existing Network Explanation
Explanation:
The management interface on a Cisco wireless LAN controller (WLC) is used for Layer 2 discovery. A WLC interface is a logical interface that can be mapped to at least one physical port. The port mapping is typically implemented as a virtual LAN (VLAN) on an 802.1Q trunk. A WLC has five interface types:
Management interface

Service port interface

Access point (AP) manager interface

Dynamic interface

Virtual interface

The management interface is used for in-band management, for Layer 2 discovery operations, and for enterprise services such as authentication, authorization, and accounting (AAA). The service port interface is statically mapped to the service port on the WLC and is used for out-of-band management. The AP manager interface is used for Layer 3 discovery operations and handles all Layer 3 communications between the WLC and an associated AP.
The virtual interface is a special interface used to support wireless client mobility. The virtual interface acts as a Dynamic Host Configuration Protocol (DHCP) server placeholder and supports DHCP relay functionality. In addition, the virtual interface is used to implement Layer 3 security, such as redirects for a web authentication login page.
The dynamic interface type is used to map VLANs on the WLC for wireless client data transfer. A WLC can support up to 512 dynamic interfaces mapped onto an 802.1Q trunk on a physical port or onto multiple ports configured as a single port group using link aggregation (LAG).
Reference:
CCDA 200-310 Official Cert Guide, Chapter 4, WLC Interface Types, pp. 184-185 Cisco: Cisco Wireless LAN Controller Configuration Guide, Release 7.4: Information About Interfaces