FD See achievable distance.
feasibility action With EIGRP, for a accurate route, the case in which the RD is lower than
the FD.
Feasible ambit With EIGRP, the metric amount for the lowest-metric avenue to a particular
subnet.
feasible almsman With EIGRP, a avenue that is not a almsman route, but that meets the
feasibility condition; can be acclimated back the almsman avenue fails, after causing loops.
FEC See Forwarding Equivalence Class.
FECN See Forward Explicit Bottleneck Notification.
FHSS See abundance bent advance spectrum.
FIB See Forwarding Information Base.
finish time A appellation acclimated with WFQ for the cardinal assigned to a packet as it is enqueued into a
WFQ queue. WFQ schedules the currently everyman FT packet next.
flash updates See triggered updates.
Flush timer With RIP, a per-route timer, which is displace and grows with the Invalid timer. When
the Flush timer mark is accomplished (default 240 seconds), the router removes the avenue from the
routing table, and now accepts any added routes about the bootless subnet.
ForeSight A Cisco-proprietary messaging agreement implemented in WAN switches that can be
used to arresting arrangement status, including congestion, absolute of end-user frames and cells.
Forward Delay timer An STP timer that dictates how continued a anchorage should break in the listening
state and the acquirements state.
Forward Explicit Bottleneck Notification A bit in the LAPF Anatomy Relay advance that, when
set to 1, implies that the anatomy has accomplished congestion.
Forwarding Equivalence Class A set of packets in an MPLS arrangement for which the MPLS
network will administer the exact aforementioned forwarding behavior.
Forwarding Information Base A acquaintance accompaniment that signifies the added router has reached
neighbor status, accepting anesthetized the constant check.
forwarding accompaniment 865
forwarding accompaniment An 802.1d STP anchorage accompaniment in which the anchorage sends and receives frames.
fraggle advance An advance agnate to a smurf attack, but application packets for the UDP Echo
application instead of ICMP.
fragmentation In wireless LANs, a apparatus that counters issues accompanying to RF interference
by adding a beyond 802.11 abstracts anatomy into abate frames that are beatific apart to the
destination. See additionally LFI.
Frame Relay Forum A bell-ringer bunch that aforetime formed to added Anatomy Relay
common bell-ringer standards.
framing From a Layer 1 perspective, the action of application appropriate strings of electrical signals
over a manual average to acquaint the receiver as to which $.25 are aerial bits, and which
fit into alone subchannels.
frequency bent advance spectrum A blazon of advance spectrum that spreads RF signals
over the abundance spectrum by transmitting the arresting at altered frequencies according to
a bent pattern. One of the aboriginal 802.11 concrete layers acclimated FHSS to action abstracts ante of
1 and 2 Mbps.
FRF See Anatomy Relay Forum.
FRF.5 An FRF accepted for Anatomy Relay-to-ATM Service Interworking in which both DTEs use
Frame Relay, with ATM in between.
FRF.8 An FRF accepted for Anatomy Relay-to-ATM Service Interworking in which one DTE uses
Frame Relay and one uses ATM.
FRF.9 An FRF accepted for burden compression.
FRF.11-c An FRF accepted for LFI for VoFR (FRF.11) VCs, in which all articulation frames are
interleaved in advanced of abstracts frames’ fragments.
FRF.12 An FRF accepted for LFI for abstracts (FRF.3) VCs.
FT See accomplishment time.
full bead A WRED action by which WRED discards all anew accession packets advised for a
queue, based on whether the queue’s best beginning has been exceeded.
full bifold Ethernet affection in which a NIC or Ethernet anchorage can both address and accept at the
same burning in time. It can be acclimated alone back there is no achievability of collisions. Loopback
circuitry on NIC cards is disabled to use abounding duplex.