Description: DHCP option 121 refers to the classless static route option. This option allows a DHCP server to provide information about static routes to clients obtaining their network configuration through this protocol. Technically, option 121 specifies a list of routes that network devices should follow to reach specific networks. Each entry in this option includes a network address and a prefix length, along with the next-hop address (gateway) that should be used to reach that network. This functionality is crucial in environments where a more complex network configuration is required, as it allows network administrators to centrally manage the routes that devices connected to the network should follow, thus facilitating the management and optimization of data traffic. Option 121 is particularly useful in large networks or those using multiple subnets, as it simplifies the configuration of the necessary routes for communication between different segments of the network.
