First National Bank's president congratulates you on successfully managing her network's addressing issues. Shen then shares that she's considering upgrading the bank's network from IPv4 to IPv6. She has heard that IPv6 is the way of the future and might even provide some security and performance benefits. She asks you to tell her more about switching to IPv6 and specifically wonders if it can be accomplished by the end of the month. You have a basic understanding of how the protocol versions differ, but her request requires you to research more practical information. Use the Internet to learn about migration strategies or find a network manager who has accomplished such a migration and interview him. As you prepare to meet with the bank president again, list the top four advantages of migrating to IPv6. Also list the top four concerns expressed by network managers when they consider switching. Which of these concerns might be most important to the bank and why?