Following are the advantages of subnetting :

• It PROTECTS one network from the INTRUSION of another. For example, in an organisation, the Developer department's code must not be accessible by any other department.
• It's possible that some subnets will require higher network priority than others. A sales department, for example, may need to host webcasts or VIDEO conferences. Subnetting makes it possible to treat networks with different priorities differently.
• Maintenance is simple in the case of small networks.

Following are the disadvantages of subnetting :

• To reach a Process in the case of a single network, only three steps are required: Source Host to Destination Network, Destination Network to Destination Host, and lastly Destination Host to Process. Subnetting, on the other hand, necessitates four phases for Inter-Network Communication. Source Host to Destination Network, Destination Network to appropriate Subnet, Subnet to Host, and lastly Host to Process are the steps. As a result, Time complexity rises. More time is necessary for communication or data transfer in the case of Subnet.
• Only two IP addresses are spent for Network Id and Broadcast ADDRESS in a single network, while two IP addresses are wasted for each Subnet in subnetting.
• The total Network's COST rises as well. Subnetting necessitates the purchase of expensive internal routers, switches, hubs, and bridges.