This information refers to the Planning for Installation chapter in your Quick Beginnings book, in the section called "Possible Client-to-Server Connectivity Scenarios."
The published protocol support chart is not completely correct. A Windows 2000 client connected to any OS/2 or UNIX based server using IPX/SPX is not supported. Also, any OS/2 or UNIX based client connected to a Windows 2000 server using IPX/SPX is not supported.