A B C D E F G H I L M N O P Q R S T U V W X Y Z

PAP - Printer Access Protocol, manages the virtual connection to printers and other servers (AppleTalk). 

PAP - Password Authentication Protocol, provides a simple method for the peer to establish its identity using a 2-way handshake (PPP suite). 

PEP - Packet Exchange Protocol, provides a semi-reliable packet delivery service that orients towards single-packet exchanges (XNS).

PIM - Protocol Independent Multicast-Sparse Mode (PIM-SM)

PMAP - Port Mapper protocol, manages the allocation of transport layer ports to network server applications (Sun).

PNNI - Private Network-to-Network Interface, hierarchial, dynamic link-state routing protocol (ATM).

POP3 - Post Office Protocol version 3, permits workstations to dynamically access a maildrop on a server host (TCP/IP).

PP - ISO Presentation Protocol, performs context negotiation and management between open systems.

PPP - Point-to-Point Protocol, designed for simple links which transport packets between two peers.

PPP Multilink - Multilink Point-to-Point Protocol, permits a system to indicate to its peer that it is capable of combining multiple physical links into a "bundle".

PPP-BPDU - PPP Bridge Protocol Data Unit, used to connect remote bridges.

PPTP - Point-to-Point Tunneling Protocol, allows PPP to be channeled through an IP network (PPP).