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Cisco Certified Network Associate (CCNA) · Cisco
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The max-age parameter controls the maximum age of STP messages in the network, which is the maximum amount of time that a switch will retain information about the network topology before discarding it. By default, the max-age is set to 20 seconds. However, in Rapid PVST+, the max-age can be set as low as 6 seconds to allow for faster convergence.
The answer is D, folks. To quote the Official Certification Guide Volume 1 Page 612: Max Age -> "How long any switch should wait, after ceasing to hear Hellos, before trying to change the STP topology. Forward Delay -> "Delay that affects the process that occurs when an interface changes from blocking state to forwarding state. A port stays in an interim listening state, and then an interim learning state, for the number of seconds defined by the forward delay timer." Now, looking at official Cisco docs, we can see the command to change the forward delay time is indeed "forward-time". https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/15-02SG/configuration/guide/config/spantree.html#56177