Which is incorrect among the following descriptions of packet switching?
选项:
A:The datagram mode is flexible and fast;
B:There are two mode of packet exchange: datagram mode and virtual circuit mode;
C:The packet switching technology has high error rate of data transmission and low line utilization rate;
D:The virtual circuit mode can establish several logical virtual circuits on one physical circuit, making users feel as if there are several physical links
发布时间:2024-06-19 10:13:24