Table of Contents Symmetry of the SIT model

2.17 Summary

The following chart shows the layered model of the TCP/IP protocol suite and also indicates the application programming interfaces (API) available to the user.


Figure: TCP/IP Layered Model

Note: Remote Procedure Call uses both TCP and UDP. It has been placed upon UDP here since NFS only uses RPC over UDP.

Note: ARP and RARP are only used on local area networks.

The IP/TCP/UDP socket API has been mentioned in Ports and Sockets. The other APIs will be explained in the next chapter:

• Kerberos (see Kerberos Authentication and Authorization System)
• X Window (see X Window System)
• FTP (see File Transfer Protocol (FTP))
• RPC (see Remote Procedure Call (RPC))
• NCS (see Network Computing System (NCS))
• SNMP DPI (see Network Management)
• CICS Socket Interface (see CICS Socket Interface).

Table of Contents Routing Protocols