Preboot Execution Environment

1) The Dynamic Host Configuration Protocol (DHCP), which allows the client to receive an IP address to gain access to the network servers.

2) A set of application program interfaces (API) that are used by the client's Basic Input/Output Operating System (BIOS) or a downloaded Network Bootstrap Program (NBP) that automates the booting of the operating system and other configuration steps.

3) A standard method of initializing the PXE code in the PXE ROM chip or boot disk.

The PXE process consists of the client notifying the server that it uses PXE. If the server uses PXE, it sends the client a list of boot servers that contain the operating systems available. The client finds the boot server it needs and receives the name of the file to download. The client then downloads the file using Trivial File Transfer Protocol (Trivia File Transfer Protocol) and executes it, which loads the operating system. If a client is equipped with PXE and the server is not, the server ignores the PXE code preventing disruption in the DHCP and Bootstrap Protocol (BP) operations.

The advantages of using PXE include:

• The client machine does not necessarily need an operating system or even a hard disk.
• The client machine can be rebooted in the event of hardware or software failure. This allows the administrator to diagnose and perhaps fix the problem.
• Since PXE is vendor-independent, new types of computers can easily be added to the network.

Read more about Preboot Execution Environment: - More information about PXE can be found at searchNetworking.com.

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