Table of Contents Symmetry
of the SIT model
The following chart shows the layered model of the TCP/IP protocol suite and
also indicates the application programming interfaces (API) available to the
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:
Table of Contents Routing