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My assumption is for entitlement and smartnet support. When you open a case you open it against the ise-vm and not the licenses sku.
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You need this becacuse it will provide the Cisco smartnet Support for you. Which help yoyu in various way.
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Vmware software which you can download from Cisco is the evaluation version. Once evaluation period will be over, you will be asked to buy the licenses as the services wont work.
ISE-VM-K9= is important to purchase due to the following reasons:-
1. It will help you in getting the Cisco smartnet Support from the Cisco engineers in case you need any help.
2. Although the demo VM you're using is free, you're obliged to pay for L-ISE-VM-K9 when you move to a production model because it uses a licensed Oracle database underneath it. You have to pay this for every instance of ISE that you run. You will then need to buy the Wireless licenses as necessary for your number of devices.