以下关于帧中继网的叙述中，错误的是()。
- A.帧中继提供面向连接的网络服务
- B.帧在传输过程中要进行流量控制
- C.既可以按需提供带宽，也可以适应突发式业务
- D.帧长可变，可以承载各种局域网的数据帧
正确答案及解析
正确答案
解析
帧中继通过PVC和SVC为用户提供通信服务，这是一种面向连接的传输服务。帧在传输过程中要通过流量整形技术来实现端速率的匹配，通过BECN-N后向显示阻塞通告、FECN-前向显示阻塞通告、CID-承诺传输率和BC-数据平均传输率等参数来实现流量整形。因此可以实现按需提供带宽，也可以适用突发式的业务。在帧中继中其帧长度可变，最大帧长可以达到1008个字节。
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