有类路由：
有类路由不导入子网掩码。并且在路由更新后也提供了子网掩码。在有类路由中，子网掩码始终相同，并非所有设备都不同，我们可以在给定的图片中看到它。在有类路由中，不支持 VLMS(可变长度子网掩码)和 CIDR(无类域间路由)。
无类路由：
无类路由导入子网掩码，并在此使用触发更新。在无类别路由中，支持 VLMS(可变长度子网掩码)和 CIDR(无类别域间路由)。在无类路由中，hello 消息用于检查状态。在无类路由中，子网掩码始终不相同，可能因设备而异，我们可以在给定的图片中看到。
让我们看看有类路由和无类路由的区别：
| S.NO | Classful Routing | Classless Routing |
|---|---|---|
| 1. | In classful routing, VLMS(Variable Length Subnet Mask) is not supported. | While in classless routing, VLMS(Variable Length Subnet Mask) is supported. |
| 2. | Classful routing requires more bandwidth. | While it requires less bandwidth. |
| 3. | In classful routing, hello messages are not used. | While in classless routing, hello messages are used. |
| 4. | Classful routing does not import subnet mask. | Whereas it imports subnet mask. |
| 5. | In classful routing, address is divided into three parts which are: Network, Subnet and Host. | While in classless routing, address is divided into two parts which are: Subnet and Host. |
| 6. | In classful routing, regular or periodic updates are used. | Whereas in this, triggered updates are used. |
| 7. | In classful routing, CIDR(Classless Inter-Domain Routing) is not supported. | While in classless routing, CIDR(Classless Inter-Domain Routing) is supported. |
| 8. | In classful routing, subnets are not displayed in other major subnet. | While in classless routing, subnets are displayed in other major subnet.. |
| 9. | In classful routing, fault can be detected easily. | While in classless routing, fault detection is little tough. |