What is the purpose of DHCP Option 43, and how is it used with WLANs?
A.
It provides clients with a temporary IP address on a restricted VLAN until 802.1X authentication is completed. Then the client receives its long-term IP address.
B.
It provides IP address bindings for specific network nodes that require long-term IP address assignments. WLAN controllers are configured to use Option 43 to receive long-term IP address leases that are centrally managed with DHCP.
C.
It supports vendor-specific IP address attributes for node discovery purposes. APs use Option 43 with vendor class identifiers to obtain the IP address of a centralized WLAN controller.
D.
It integrates a DHCP server with AAA servers and user databases to dynamically assign IP addresses to client devices. During 802.1X, the AAA server uses DHCP Option 43 to assign IP addresses based on user credentials.
DHCP Option 43 is utilized to provide vendor-specific information to DHCP clients. In WLAN deployments, particularly with lightweight access points (APs), Option 43 is used to convey the IP address of the Wireless LAN Controller (WLC) that the AP should join. The AP includes a Vendor Class Identifier (Option 60) in its DHCP Discover message, and the DHCP server responds with Option 43 containing the WLC's IP address. This mechanism facilitates the automatic discovery and association of APs with their respective controllers, streamlining network deployment and management.Cisco
[Reference: CWDP-305 Official Study and Reference Guide, Chapter on Infrastructure Design, , ]
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