Asus DELUXE/WD P8Z77-I - Manual (Page 98)

3-30 Chapter 3: BIOS setup
Chapter 3
3.5.8 Network Stack
Network Stack [Disable Link]
This item allows user to disable or enable the UEFI network stack.
Configuration options: [Disable Link] [Enabled]
The following item appears only when you set the Network Stack to [Enabled].
Ipv4/Ipv6 PXE Support [Enabled]
Allows you to enable or disable the Ipv4/Ipv6 PXE boot option.
Configuration options: [Disable Link] [Enabled]