You have done a partial migration from 802.1D STP to 802.1w STP. Which of the following is true?
A.
802.1D and 802.1w interoperate only when the 802.1D STP domain supports rapid convergence.
B.
Ports leading to 802.1D devices will run in compatibility mode, while the rest of the ports will run in 802.1w mode.
C.
This is an invalid configuration and a partial migration cannot be done.
D.
The bridge timers will be set to match the 802.1D devices.
E.
A secondary root bridge will always be populated within the 802.1D domain.
F.
If the root bridge is selected within the 802.1D domain, the whole STP domain will run in 802.1D compatibility mode.
G.
In partially migrated 802.1w networks, it is recommended to keep the STP diameter below 4.
Explanation:
IEEE 802.1w RSTP is designed to be compatible with IEEE 802.1d STP. Even if all the other devices in your network are using STP, you can enable RSTP on your switch, and even using the default configuration values, your switch will interoperate effectively with the STP devices. If any of the switch ports are connected to switches or bridges on your network that do not support RSTP, RSTP can still be used on this switch. RSTP automatically detects when the switch ports are connected to non-RSTP devices in the spanning tree and communicates with those devices using 802.1d STP BPDU packets.