FANP: Flow Attribute Notification Protocol
Flow Attribute Notification Protocol (FANP) is a protocol between neighbor modes which manages cut-through packet forwarding functionalities. In cut-through packet forwarding, a router doesn't perform conventional IP packet processing for received packets. FANP indicates mapping information between a datalink connection and a packet flow to the neighbor node. It helps a pair of nodes manage mapping information. By using FANP, routers such as the CSR (Cell Switch Router) can forward incoming packets based on their datalink-level connection identifiers, bypassing usual IP packet processing. FANP generally runs on ATM networks.
Standard Organization: Toshiba

Fast Ethernet
Fast Ethernet (100BASE-T) offers a speed increase ten times that of the 10BaseT Ethernet specification, while preserving such qualities as frame format, MAC mechanisms and MTU. Such similarities allow the use of existing 10BaseT applications and network management tools on Fast Ethernet networks. Officially, the 100BASE-T standard is IEEE 802.3u.
Standard Organization: IEEE
Reference Document: IEEE 802.3u

FC-0 Layer
FC-0, also known as FC-PH(the physical layer), is the lowest level of Fibre Channel. FC-0 defines the physical links in the system, including the fibre, connectors, optical and electrical parameters for a variety of data rates.
Standard Organization: ANSI

FC-1 Layer
FC-1, also known as FC-PH, is the data link layer in the Fibre Channel protocols. FC-1 implements the 8b/10b encoding and decoding of signals. FC-1 defines the transmission protocol including serial encoding and decoding rules, special characters and error control. The transmission code must be DC balanced to support the electrical requirements of the receiving units. The Transmission Characters ensure, that short-run lengths and enough transitions are present in the serial bit stream to make clock recovery possible
Standard Organization: ANSI

FC-2 Layer
FC-2, also known as FC-PH, is the network layer protocol in the Fibre Channle suite. FC-2 is defined by the FC-PI-2 standard, which consists of the core of FC. The framing rules of the data to be transferred between ports, the different mechanisms for controlling the three service classes and the means of managing the sequence of a data transfer are defined by FC-2.
Standard Organization: ANSI

FC-3 Layer
FC-3 is the common services layer in the Fibre Channel protocol suite, a thin layer that could eventually implement functions like encryption or RAID. The FC-3 level of the FC standard is intended to provide the common services required for advanced features such as: Striping to multiply bandwidth using multiple N_ports in parallel to transmit a single information unit across multiple links; Hunt groups for more than one Port to respond to the same alias address; and Multicast to deliver a single transmission to multiple destination ports.
Standard Organization: ANSI

FC-4 Layer
FC-4 the highest level in the Fibre Channel structure defines the application interfaces that can execute over Fibre Channel. FC-4 specifies the mapping rules of upper layer protocols using the FC levels below. FC-4 is a layer in which other protocols, such as SCSI, are encapsulated into an information unit for delivery to FC2.
Standard Organization: ANSI

FCIP: Fibre Channel Over TCP/IP
Fibre Channel Over TCP/IP (FCIP) describes mechanisms that allow the interconnection of islands of Fibre Channel storage area networks over IP-based networks to form a unified storage area network in a single Fibre Channel fabric. FCIP relies on IP-based network services to provide the connectivity between the storage area network islands over local area networks, metropolitan area networks or wide area networks.
Standard Organization: IETF
Reference Document: RFC 3821

FCP: Fibre Channel Protocol
Fibre Channel Protocol (FCP) is the interface protocol of SCSI on the Fibre Channel. FCP maps the SCSI commands to the Fibre Channel transport layer.
Standard Organization: ANSI

FCS: Fibre Channel Standards
The Fibre Channel Standards (FCS) define a high-speed data transfer mechanism that can be used to connect workstations, mainframes, supercomputers, storage devices and displays. FCS addresses the need for very fast transfers of large volumes of information and could relieve system manufacturers of the burden of supporting the variety of channels and networks currently in place, as it provides one standard for networking, storage and data transfer. Fibre Channel Protocol (FCP) is the interface protocol of SCSI on the Fibre Channel.
Standard Organization: ANSI

FDDI: Fiber Distributed Data Interface
Fiber Distributed Data Interface (FDDI) is a set of ANSI protocols for sending digital data over fiber optic cable. FDDI networks are token-passing (similar to IEEE 802.5 Token Ring protocol) and dual-ring networks and support data rates of up to 100 Mbps. FDDI networks are typically used as backbone technology because the protocol supports a high bandwidth and a great distance. A related copper specification similar to FDDI protocols, called Copper Distributed Data Interface (CDDI), has also been defined to provide 100 Mbps service over twisted-pair copper.
Standard Organization: ANSI
Reference Document: X3T9.5 and X3T12

FDDI II: Fiber Distributed Data Interface II
Fiber Distributed Data Interface II (FDDI II or FDDI-2) is an ANSI standard that enhances FDDI. FDDI II provides isochronous transmission for connectionless data circuits and connection-oriented voice and video circuits.
Standard Organization: ANSI

Fibre Channel
Fibre Channel is a group of multi-gigabit speed network technology primarily used for Storage Networking using both coaxial cable or fiber. There are three major Fibre Channel topologies: Point-to-Point (FC-P2P) in which two devices are connected back to back; Arbitrated Loop (FC-AL), in which all devices are in a loop or ring; and Switched Fabric (FC-SW), in which all devices are connected to Fibre Channel switches. Fibre Channel is a layered protocol. It consists of 5 layers, namely: FC0, FC1, FC2, FC3 and FC4.
Standard Organization: ANSI

Finger User Information Protocol
The Finger user information protocol provides an interface to a remote user information program (RUIP). Finger is a protocol, based on the Transmission Control Protocol, for the exchange of user information using TCP port 79. The local host opens a TCP connection to a remote host on the Finger port. A RUIP becomes available on the remote end of the connection to process the request. The local host sends the RUIP a one line query based upon the Finger query specification and waits for the RUIP to respond.
Standard Organization: IETF
Reference Document: RFC 1288

FLAP: FDDITalk Link Access Protocol
FDDITalk Link Access Protocol (FLAP) is the AppleTalk protocol used for the FDDI interface. The FLAP protocol resides in the Data Link Layer of the OSI Reference Model.
Standard Organization: Apple

Frame Relay
Frame Relay is a WAN protocol for LAN internetworking which operates at the physical and data link layer to provide a fast and efficient method of transmitting information from a user device to another across multiple switches and routers. Frame Relay is based on packet-switched technologies similar to x.25, which enables end stations to dynamically share the network medium and the available bandwidth. It employs the following two packet techniques: a) Variable-length packets and b) Statistical multiplexing. It does not guarantee data integrity and discards packets when there is network congestion. In reality, it still delivers data with high reliability.
Standard Organization: ITU-T

FreeDCE
FreeDCE is the Open Group's reference implementation of Distributed Computing Environment/Remote Procedure Calls (DCE/RPC) updated to be interoperable with Free Software development practices. FreeDCE is DCE 1.1 reworked, and it includes an up-to-date implementation of DCEThreads that actually works with the Linux 2.4 and 2.6 kernels on x86 hardware and also on AMD64 processors.
Standard Organization: Open Group

FSSRP: Fast Simple Server Redundancy Protocol
Fast Simple Server Redundancy Protocol (FSSRP), an improvement of the ATM LAN Emulation (LANE) Simple Server Replication Protocol (SSRP), creates fault-tolerance using standard LANE protocols and mechanisms. FSSRP differs from LANE SSRP in that all configured LANE servers of an Emulated LAN (ELANE) are always active. FSSRP-enabled LANE clients have virtual circuits (VCs) established to a maximum of four LANE servers and broadcast and unknown servers (BUSs) at one time. If a single LANE server goes down, the LANE client quickly switches over to the next LANE server with BUS resulting in no data or LE-ARP table entry loss and no extraneous signalling.
Standard Organization: Cisco

FST: Fast Sequenced Transport
Fast Sequenced Transport (FST) is a connectionless, sequenced transport protocol that runs on top of the IP protocol. Source-Route Bridging (SRB) traffic is encapsulated inside of IP datagrams and is passed over a FST connection between two network devices (such as routers). FST speeds up data delivery, reduces overhead, and improves the response time of SRB traffic.

FTAM: File Transfer Access Management Protocol
The File Transfer Access and Management protocol (FTAM), an ISO application protocol, offers file transfer services between client (initiator) and server (responder) systems in an open environment. FTAM also provides access to files and management of files on diverse systems. Similar to FTP (File Transfer Protocol) and NFS (Network File System) in the TCP/IP environment, FTAM is designed to help users access files on diverse systems that use compatible FTAM implementations.
Standard Organization: ISO

FTP: File Transfer Protocol
File Transfer Protocol (FTP) enables file sharing between hosts. FTP uses TCP to create a virtual connection for controling information and then creates a separate TCP connection for data transfers. The control connection uses an image of the TELNET protocol to exchange commands and messages between hosts.
Standard Organization: IETF
Reference Document: RFC 959

FUNI: Frame-based User-to-Network Interface
Frame-based User-to-Network Interface (FUNI), developed by the ATM Forum, is for users with the ability to connect between ATM networks and existing frame-based equipment such as routers and switches. FUNI uses a T1/E1 interface and offers a relatively easy and cost-effective method for users to take advantage of ATM infrastructure or an ATM backbone, while not having to replace existing equipment with more expensive ATM equipment.