以下关于链路加密的说法中，错误的是（）。
- A.链路加密网络中每条链路独立实现加密
- B.链路中的每个节点会对数据单元的数据和控制信息均加密保护
- C.链路中的每个节点均需对数据单元进行加解密
- D.链路加密适用于广播网络和点到点网络
正确答案及解析
正确答案
解析
链路加密是传输数据仅在物理层前的数据链路层进行加密。即经过一台节点机（接受方）的所有网络信息传输均需加、解密。这种方式中，节点都有密码装置，用于解密、加密报文。
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