By way of support to the above - we ran up instances, 'islanded' due to security requirements which met very stringent accreditations.
The devil in the detail re Q3 - if you are a Network Engineer then no probs. If you are an end user then perhaps seek advice. Users access Splunk via HTTP or HTTPS to run searches so how much control you have over your user community is probably your exposure, and where the indexer is / any forwarders. Well worth engaging consultancies to plan your deployment model if complex. Eqalis in the UK are excellent. Good luck, have fun - its a great product.
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