Facilitating Layer 3 CAPWAP Discovery in LAN Network Segment

AC.

The correct answers are A. Utilize DHCP option 43 and C. Configure an ip helper-address on the router interface.

Layer 3 CAPWAP (Control and Provisioning of Wireless Access Points) discovery is a process where a lightweight access point (LWAP) discovers and connects to a Wireless LAN Controller (WLC) in a wireless network. This process involves the LWAP sending a Layer 3 broadcast message to discover the WLC.

To facilitate Layer 3 CAPWAP discovery for a lightweight AP in a LAN network segment, the following actions should be taken:

A. Utilize DHCP option 43: DHCP (Dynamic Host Configuration Protocol) option 43 is used to provide LWAPs with the IP address of the WLC. The WLC IP address is included in the DHCP option 43 field as a hexadecimal string. When the LWAP receives the DHCP response with the option 43 field, it uses the WLC IP address to establish a CAPWAP tunnel to the WLC.

C. Configure an ip helper-address on the router interface: An ip helper-address is used to forward broadcast packets to a specified destination IP address. In this case, the ip helper-address should be configured on the router interface that connects the LAN to the WLC management network. The ip helper-address should be set to the IP address of the WLC management interface. This allows the LWAP to send Layer 3 broadcast messages, which are then forwarded by the router to the WLC management interface.

Therefore, options A and C are correct answers to facilitate Layer 3 CAPWAP discovery for a lightweight AP in a LAN network segment.

Option B (Utilize DHCP option 17) is incorrect because there is no DHCP option 17.

Option D (Enable port security on the switch port) is also incorrect because it does not have any relation to Layer 3 CAPWAP discovery.

Option E (Configure WLC IP address on LAN switch) is incorrect because it is not a valid action to facilitate Layer 3 CAPWAP discovery. The WLC IP address should be provided to the LWAP through DHCP option 43.