RANAP - Radio Access Network Application Part is the Radio Netwok Layer signalling protocol for the Iu interface.

RIP - Routing Information Protocol, maintains a database of network hosts and exchange information about the topology of the network (XNS).

RIP2 - Routing Information Protocol, used by Berkeley 4BSD UNIX systems to exchange routing information. RIP2 derives from the Xerox protocol of the same name (TCP/IP).

RIPX - Routing Information Protocol, used to collect, maintain and exchange correct routing information among gateways within the Internet (Novell).

RFC - Request for Comments, a series of notes about the Internet, started in 1969 (when the Internet was the ARPANET). The notes discuss many aspects of computing and computer communication focusing in networking protocols, procedures, programs, and concepts, but also including meeting notes, opinion, and sometimes humor. The specification documents of the Internet protocol suite, as defined by the Internet Engineering Task Force (IETF) and its steering group (the IESG), are published as RFCs. Many of the TCP/IP protocols and PPP protocols are defined by rfc's.

RLOGIN - Remote Login, allows UNIX users of one machine to connect to other UNIX systems across the Internet and interact as if their terminals are directly connected to the machines (TCP/IP).

RLP - Radio Link Protocol

RM Cells - Rate Management cells (ATM cells).

RND - name of a company which uses a proprietary protocol header (RND) to transfer LAN protocols via WAN.

RP - Routing Protocol, distributes routing information among DECnet hosts.

RPC - Remote Procedure Call protocol, activates a function on a remote station and retrieves the result (Sun).

RSVP - Resource ReSerVation setup Protocol, designed for an integrated services Internet (TCP/IP).

RTMP - Routing Table Maintenance Protocol, manages routing information for AppleTalk networks.

RTP - Routing Update Protocol, used to distribute network topology (Banyan).

RUDP - Reliable UDP

RVP - Remote Voice Protocol