RIP最新的增强版是RIP - 2规范，它允许在RIP报文中包含路由汇总、无类域问路由、变长子网掩码等信息，并提供了简单的认证机制。
The new version of RIP is RIP-2. It allows packets to include such information as routing summary, classless interdomain routing, variable length subnet mask and simple authentication.
作为替代，接收方可以决定将类库域添加到他们的定义中。
As an alternative, the recipients could decide to add the class library domain to their definitions.
在该方案中，类库域按照这一做法以便将来可以添加额外的域。
In the scenario, the class library domain follows this practice so that additional domains can be added in the future.
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