IN CUWN, what DHCP option needs to be configured for APs to join specific WLCs, if the WLCs and APs reside in different subnets?
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A. B. C. D.A.
In CUWN ( Cisco Unified Wireless Network), if the WLCs (Wireless LAN Controllers) and APs (Access Points) reside in different subnets, DHCP (Dynamic Host Configuration Protocol) can be used to provide the APs with the IP addresses of the WLCs they need to join. This is done by configuring specific DHCP options, which are special parameters that can be passed to DHCP clients such as APs.
Out of the four options provided, the DHCP option that needs to be configured for APs to join specific WLCs is Option 43.
Option 43 is a vendor-specific DHCP option that is used to provide APs with the IP addresses of one or more WLCs. Specifically, it allows the WLC to specify a list of WLC management IP addresses that the AP can use to discover and join the appropriate WLC. Option 43 consists of a TLV (Type-Length-Value) format, where the Type is always 0x0B and the Length varies depending on the number of WLC IP addresses provided. The Value contains one or more IP addresses of the WLCs in hex format.
Option 60 is a DHCP option used to identify the type of client requesting an IP address. It is not used for WLC discovery.
Option 82 is a DHCP option used for relay agent information, which provides additional information about the client's network location. It is not used for WLC discovery.
Option 150 is a DHCP option used to provide clients with the IP address of a TFTP (Trivial File Transfer Protocol) server, which is typically used for firmware upgrades and other configuration-related tasks. It is not used for WLC discovery.
In summary, to configure DHCP for APs to join specific WLCs in CUWN, you need to configure Option 43 with the list of WLC management IP addresses.