Question on wireless controller 4400

Hi , i am configuring  two WLANs one secure and one open.  My question is why do i need to create a vlan for each wlan ? i.e vln 5 for the open wlan and vlan 6 for the secure ? Do i need to assign a subnet on each of these vlans ?  
I understand the concept of the vlan when it comes to the AP devices.  But i am not sure about the vlans when it comes to the actual wlans.

any info would be apprecaited.
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Aaron TomoskySD-WAN SimplifiedCommented:
So the open vlan can only go to the Internet and not bounce all vet your secure network.

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c_hocklandAuthor Commented:
so i have to have a subnet allocated for each WLAN , right ?
Yes, separate IP subnets for each vlan/wlan
c_hocklandAuthor Commented:
thanks guys.
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