【求助】關於BOOTP協定的說明

[drinktealo]

最近在研究BOOTP的RFC
第一段裡面有提到一句實在看不太懂
不知可否請各位高手幫忙
原文如下(有問題的部份為紅字處)：
This RFC describes an IP/UDP bootstrap protocol (BOOTP) which allows a diskless client machine to discover its own IP address, the address of a server host, and the name of a file to be loaded into memory and executed. The bootstrap operation can be thought of as consisting of TWO PHASES. This RFC describes the first phase, which could be labeled ’address determination and bootfile selection’. After this address and filename information is obtained, control passes to the second phase of the bootstrap where a file transfer occurs. The file transfer will typically use the TFTP protocol [9], since it is intended that both phases reside in PROM on the client. However BOOTP could also work with other protocols such as SFTP [3] or FTP [6].

我不是沒作功課就上來問的
底下是我自己的譯文
就差這句看不懂

這份請求建議書(RFC)說明的是一套使用IP/UDP的開機協定(bootstrap protocol，BOOTP)，無磁碟機的客戶端機器可以透過這套協定取得它的IP位址，伺服器的位址，要載入記憶體並執行的檔案名稱。開機過程可以分成兩個階段。這份請求建議書(RFC)說明的是第一個階段，即” 決定位址與選擇開機檔案”。在取得位址與檔案名稱後，系統就進入開機過程的第二個階段，檔案的傳輸。since it is intended that both phases reside in PROM on the client，所以檔案傳輸通常使用TFTP協定 [9]。但是BOOTP也能跟其它協定，如SFTP [3] 或FTP [6] 一起運作。

拜託各位高手解惑一下了

[swr]

since it is intended that both phases reside in PROM on the client

從協定打算要做檔案傳輸這二個階段存在於PROM之於客戶端

這邊的it是指bootstrap protocol,that是指動作

這段的大意是講，這二個階段都是在客戶端的PROM動作