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2.1.2 Client

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The client MUST use RPC over TCP/IP (that is, ncacn_ip_tcp), as specified in [MS-RPCE], as the RPC protocol sequence to communicate with the server. The higher-level protocol or client application MUST specify the Simple and Protected GSS-API Negotiation Mechanism [MS-SPNG] (0x9), NTLM [MS-NLMP] (0xA), or Kerberos [MS-KILE] (0x10) as the RPC authentication service, as specified in [MS-RPCE], and the protocol client MUST pass this choice unmodified to the RPC layer. The client MUST specify packet-level integrity authentication (0x5) or higher, as specified in [MS-RPCE] section 2.2.1.1.8. <5>