Connection between lightweight access point and switch?

Hello everybody,
I am a bit confused about cisco 1000 series access point connection. On wireless lan controller and lightweight access point basic configuration example document id 69719 (http://www.cisco.com/en/US/products/ps6366/products_configuration_example09186a0080665cdf.shtml), I understood the access point has two vlans associated with (vlan 3 and 4). Am I correct?
Why is connection between access point and catalyst port just access port rather 802.1q trunk? How vlan traffic can traverse from the access point to controller?
Please advice.
Many thanks,
Nitass

Nitass,
The AP itself does not need to be a trunked port, but the uplink to the controller does. When using a Lightweight enviroment, all the traffic passes thru an encrypted LWAPP tunnel from the AP to the controller, and then gets sent out the correct VLAN interface on the controller.

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