EIGRP: Enhanced Interior Gateway Routing Protocol. An advanced version of IGRP developed by Cisco. Provides superior convergence properties and operating efficiency and combines the advantage of link-state protocols with those of distance vector protocols.
encoding: The conventions for how a device varies the electrical or optical signals sent over a cable to imply a particular binary code. For instance, a modem might encode a binary 1 or 0 by using one frequency to mean 1 and another to mean 0.
EtherChannel: Developed and copyrighted by Cisco Systems. A logical aggregation of multiple Ethernet interfaces used to form a single higher-bandwidth routing or bridging endpoint.
feasible successor: To converge quickly, EIGRP keeps track of possible alternative next-hop routers for each route’s feasible successor is a neighboring that can be used as a replacement next-hop router for a particular route when it fails.
FECN: Forward Explicit Congestion Notification. The bit in the Frame Relay header that signals to anything receiving the frame (switches and DTEs) that congestion is occurring in the same direction as the frame.
filter: generally, a process or a device thet screens network traffic for certain characteristics,such as source address ,destination address,or protocol,and determines whether to forward or discard that traffic based on the established criteria.
forward: To send a frame toward its ultimate destination by way of an internetworking device.
Forward Delay timer: A timer that sets the amount of time an interface spends in the STP listening and learning states. In other words, an interface stays in each of these two states for the Forward Delay amount of time.
forwarding state: A Spanning Tree Protocol port state in which the bridge or switch processes frames (input or output) on the interface, with the exception of STP messages.
framing: The conventions for how the bits sent according to OSI Layer 1 are interpreted by Layer 2.for instance, after an electrical signal has been received and converted to binary, framing identifies the information fields inside the data.
FTP: File Transfer Protocol. An application protocol, part of the TCP/IP protocol stack,used to transfer files between network nodes FTP is defined in RFC 959.
function group: An ISDN term that generically refers to set of functions that a piece of hardware or software must perform. Because the ITU wanted several options for the customer,it defined multiple different function groups. See also reference point.
HDLC: High-Level Data Link Control. A bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO).Derived from synchronous data link control (SDLC) HDLC specifies a data encapsulation method on synchronous serial links using frame characters and checksums.