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When a DHCP server receives a DHCPREQUEST message, it extracts the NAP-SoH (section 2.2.1.1) and NAP-CoID (section 2.2.1.3) options from the message packet by calling DhcpExtractVendorSpecificOption ([MS-DHCPE] section 3.2.7.3). If the NAP-SoH (section 2.2.1.1) option is of length equal to one octet and its data is equal to zero, a server that is NAP-enabled (determined per section 1.4 points 1 and 2) MUST respond with a DHCPACK message containing the NAP-SoH option of length 3 and data as the string "NAP" and the NAP-CoID (section 2.2.1.3) option as it is in the DHCPREQUEST message packet. The remaining options in the DHCPACK message SHOULD be the same as would be sent to a client that is not capable of supporting NAP. The NAP-SoH (section 2.2.1.1) and NAP-CoID (section 2.2.1.3) options are appended to the DHCPACK message packet by calling DhcpAppendVendorSpecificOption ([MS-DHCPE] section 3.2.7.1).
Otherwise, the message MUST be processed as specified in section 3.2.5.2.1.