WAN boot supports varying levels of security. You can use a combination of the security features that are supported in WAN boot to meet the needs of your network. A more secure configuration requires more administration, but also protects your system data to a greater extent.
For the Oracle Solaris 10 OS, refer to the information on securing WAN boot installation configuration in Oracle Solaris Installation Guide: Network-Based Installations.
For the Oracle Solaris 11 OS, refer to Securing the Network in Oracle Solaris 11.3.