2. 计算机
  3. Users have been complaining that their Frame Relay connection to the corporate site is very slow． The network administrator susp

Users have been complaining that their Frame Relay connection to the corporate site is very slow． The network administrator susp

admin2019-04-08  26
问题 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 pvccommand shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion?
选项 A、        DLCI = 100
B、        last time PVC status changed 00:25:40
C、        in BECN packets 192
D、        in FECN packets 147
E、        in DE packets 0
答案C
解析 BECN为后向拥塞指示，FECN为前向拥塞指示。
在帧中继网络里，前向显式拥塞通告（FECN）是发送端向接收端发送的降低数据传输速率的请求；后向显式拥塞通告（BECN）是接收端向发送端发送的降低数据传输速率的请求。当大量数据包到达而来不及处理时，FECN和BECN可以最大程度地减小数据包丢失的可能性。如果在通信电路中，发送端频繁地发送FECN帧，说明网络的可用带宽无法满足接收端的需要。同样的，如果接收端频繁地发送BECN帧，则说明网络的可用带宽不能满足发送端的需要。
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