Complexity can pile up in SDN environments just as quickly as it does in on-premise networks – and where complexity goes, human error often follows. This complexity is compounded by the fact that within SDN there are a range of security options available – from virtual firewalls or host-based firewalls to using native security controls offered by the vendor, with each having its own strengths and weaknesses. Regardless of which security controls you use it’s critical to remember that each come with their own pros and cons. The upshot of all this is that ‘islands’ of SDN automation are likely to develop, which are automated in themselves, but do not cover the entire organization.

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