Because packet encryption devices do not require a one - to - one relationship with the links or circuits they encrypt , network managers can more readily implement redundant devices to avoid a single point of failure 由于包加密装置不需要与它们加密的链路或线路有一对一的关系，所以网络管理员可以更容易地设置冗余装置，以避免单一点的失效。
