"深入解析PXE启动规范2.1：从客户端引导行为的透视"。

Preboot Execution Environment (PXE) Specification -- Version 2.1 is a document that outlines the processes and protocols involved in the legacy boot process known as PXE boot, specifically from the perspective of the PXE client's "boot behavior". Released on September 20, 1999 by Intel Corporation with contributions from SYSTEMSOFT, this specification provides a detailed explanation of how network card booting through PXE works. The document is organized in a top-down manner, starting with the behavior of the PXE client during the boot process. It covers various aspects such as the initialization of the PXE environment, obtaining configuration information from the server, loading and executing boot code, and performing network boot services. It outlines the specific steps that the PXE client takes to successfully boot from the network using the PXE protocol. One key focus of the PXE Specification is the role of the PXE Boot ROM in the boot process. The specification details how the PXE Boot ROM initializes the network controller, obtains an IP address from a DHCP server, and downloads boot code from a TFTP server. It also describes the protocol used for communication between the PXE client and the PXE server, ensuring a standardized and efficient boot process. Furthermore, the document delves into the configuration options available to the PXE client, including parameters that can be set to customize the boot behavior. It also addresses security considerations, such as authentication and encryption, to ensure the integrity and confidentiality of the boot process. Overall, the PXE Specification Version 2.1 serves as a comprehensive guide for understanding the PXE boot process and implementing it effectively. By providing detailed insights into the protocol and behavior of the PXE client, this document is an essential resource for network administrators and developers working with PXE boot technology.