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。