You are the lead network engineer for a large manufacturing company that has 16 datacenters, over 300 offices around the world, and over 180,000 employees. Your company has grown over the past 30 years through dozens of acquisitions, and each acquisition used different products and made very inefficient use of the RFC 1918 private IP ranges, so that you have actually exhausted all the private IP ranges. Your manager is panicking. She asks you to put together a high-level transition plan that will accommodate the next merger and eventually replace IPv4 with IPv6 across the whole company. In the plan, include a list of the technologies you intend to use and how and when.