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5 5 8 8 C C h h a a p p t t e e r r 7 7
IGURE IN A F ENVIRONMENT
How MBA Works in a Wired for Management Environment using PXE
The MBA ROM first sends a broadcast to all of the servers on the network to see if one of
them is running a DHCP service and has the required information for the PC (i.e. the PC’s IP
address). The response from the DHCP service provides the PC with its IP address. Also, a
Proxy DHCP service running on a Boot Server will respond to the PC with the IP address of
the Boot Server.
The PC then sends a special DHCP request to the Boot Image Negotiation Layer (BINL)
service running on the Boot Server, to get the filename of the network bootstrap program.
The BINL Service replies with the filename.
The PC then sends a TFTP request to the Boot Server to transfer a copy of the bootstrap file
that is stored in the PC's memory as a RAM disk. When the entire file is received, MBA
passes control over to the downloaded file. The bootstrap then performs the function that it
was programmed to do—this may include downloading further files from the server using
TFTP.