The technical basis, on which Azure will rely on, during the installation is as follows:

• The internet connectivity
• Availability of DNS for internet name resolution
• Availability of a reliable time server (if no internal one is available, it will try to connect to time.windows.com)
• DHCP services (if this is your deployment option) or availability of static IPs
• Network connectivity during the whole deployment time

As most of the requirements of the deployment will be available in 99% of each company, the issues mostly will be part of different topics.