03-13-2012, 10:04 AM
sorry, i prefer to think more rather then less.
ip directed broadcast is not a simple broadcast which is dropped by the router
An IP directed broadcast is an IP packet whose destination address is a valid broadcast address for some IP subnet, but which originates from a node that is not itself part of that destination subnet.
ip directed-broadcast - command to enable the translation of a directed broadcast to physical broadcasts
IOS 10.0 This command was introduced.
IOS 12.0 The default behavior changed to directed broadcasts being dropped.
1. router from IOS 10.0 to 12.0 do not drop directed broadcast by default. Router after IOS 12.0 do not drop those broadcasts if enabled.
2. the statement "because it is not a valid IP address" is not correct what makes this answer wrong.
3. RT1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF is correct if RT1 has the IOS prior to 12 or was configured with IP directed broadcast command.
hope you can follow this logic.
ip directed broadcast is not a simple broadcast which is dropped by the router
An IP directed broadcast is an IP packet whose destination address is a valid broadcast address for some IP subnet, but which originates from a node that is not itself part of that destination subnet.
ip directed-broadcast - command to enable the translation of a directed broadcast to physical broadcasts
IOS 10.0 This command was introduced.
IOS 12.0 The default behavior changed to directed broadcasts being dropped.
1. router from IOS 10.0 to 12.0 do not drop directed broadcast by default. Router after IOS 12.0 do not drop those broadcasts if enabled.
2. the statement "because it is not a valid IP address" is not correct what makes this answer wrong.
3. RT1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF is correct if RT1 has the IOS prior to 12 or was configured with IP directed broadcast command.
hope you can follow this logic.