帧中继技术是一种成熟的快速分组交换技术，而AT M技术则是宽带网络的重要技术。
Frame Relay is a kind of mature fast switch technology, while ATM technology is one of the important broadband technologies.
目前网络通信中通常采用的是分组数据加密算法——DES，它拥有简捷、快速和标准化的特点，软硬件技术的实现也已经非常成熟。
The software and hardware technology of DES is also very mature, but there are some weaknesses of DES in security and etc.
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