Preboot Execution Environment: differenze tra le versioni
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Hce (discussione | contributi) + trad |
Hce (discussione | contributi) |
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Riga 15:
Il firmware cerca un PXE redirection service, ovvero un server DHCP che fornisca i parametri necessari per conoscere i server PXE disponibili e il nome del [[#Network_Bootstrap_Program|network bootstrap program]] (NBP) da scaricare. Se ne trova uno, il firmware lo scaricherà via TFTP da uno dei boot server, memorizzandolo nella propria [[Random Access Memory|RAM]], ne verificherà la correttezza e lo eseguirà.
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== Availability ==
Riga 51:
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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