Preboot Execution Environment: differenze tra le versioni
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== Piattaforme supportate ==
PXE è stato progettato per essere utilizzabile su molte architetture. La specifica v2.1 definisce identificatori di architettura per 6 tipi di sistemi, compresi IA64 Itanium architecture e Alpha. Tuttavia, la specifica copre competamente solo Intel 32 Bit ([[IA-32]]). Intel ha incluso PXE nella [[Extensible Firmware Interface]] per [[IA-64]], creando uno standard de facto con la sua implementazione.
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== PXE Client/Server Protocol ==
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A PXE Boot Server as described in version 2.1 of the PXE specification '''should''' support the Boot Integrity Services (BIS) as described in the [ftp://download.intel.com/design/archives/wfm/downloads/bisspec.pdf BIS specification] v1.0 published by Intel. The BIS allow a PXE Client to verify downloaded NBPs using a [[checksum]] file which is downloaded from the same boot server as the NBP was. To get the file path of this ''credentials'' file another exchange of ''extended DHCPREQUEST'' and ''extended DHCPACK'' is required.
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=== Network Bootstrap Program ===
After receiving the requested ''extended DHCPACK'', the ''Network Bootstrap Program'' is downloaded into the RAM and if it was verified or verification was not required, the NBP will be executed. It has access to the APIs of the PXE firmware extension (Pre-boot, UDP, TFTP, UNDI). Its functions or tasks are not described in the PXE specification.
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