Users have been complaining that their Frame Relay connection to the corporate site is very slow.
The network administrator suspects that the link is overloaded. Based on the partial output of the
Router # show frame relay pvc command shown in the graphic, which output value indicates to the
local router that traffic sent to the corporate site is experiencing congestion?
A.
DLCI=100
B.
last time PVC status changed 00:25:40
C.
in BECN packets 192
D.
in FECN packets 147
E.
in DF packets 0
FECN (forward explicit congestion notification) is a header bit transmitted by the source (sending) terminal requesting that the destination (receiving) terminal slow down its requests for data. BECN (backward explicit congestion notification) is a header bit transmitted by the destination terminal requesting that the source terminal send data more slowly. FECN and BECN are intended to minimize the possibility that packets will be discarded (and thus have to be resent) when more packets arrive than can be handled.
In general, BECN is used on frames traveling away from the congested area to warn source devices that congestion has occurred on that path while FECN is used to alert receiving devices if the frame experiences congestion.
BECN also informs the transmitting devices to slow down the traffic a bit until the network returns to normal state.
The question asks “which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion” which means it asks about the returned parameter which indicates congestion -> BECN.