1.7 Versioning and Capability Negotiation
Protocol Version: The RPC interface for the LREC protocol is version 1.0. The protocol can be extended by adding RPC messages to the interface with opnums higher than those defined in this specification. An RPC client determines whether a method is supported by attempting to invoke the method. If the method is not supported, the RPC runtime returns an "opnum out of range" error as specified in [C706] and [MS-RPCE]. RPC versioning and capacity negotiation in these situations is as specified in [C706] and [MS-RPCE].
Security and Authentication Methods: The LREC protocol supports the following authentication methods: NTLM and Kerberos as specified in [MS-RPCE] section 1.7.