An engineer adds a new switch to a Cisco StackWise stack. The switch that was active before the switch was added is elected as the active switch again. Which action does the active switch take?
A.
It suspends traffic forwarding until the new switch is updated with the current running configuration of the stack.
B.
It checks the IOS and running configuration of the new switch and updates them if necessary to match the other switches in the stack.
C.
It removes any Layer 3 configuration on the new switch to maintain normal Layer 2 functionality on the stack.
D.
It clears the MAC table of the stack and relearns the attached devices.
Upgrading a Switch Running Incompatible Software
The auto-upgrade and auto-advise features enable a switch with software packages that are incompatible with the switch stack to be upgraded to a compatible software version so that it can join the switch stack.
ref: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9200/software/release/17-3/configuration_guide/ha/b_173_stck_mgr_ha_9200_cg/managing_switch_stacks.html
Answer B seems correct.
"If the stack master detects that the software on a new switch does not match, it upgrades (or downgrades) the new switch with the active image that is running on the switch stack by using the automatic upgrade (auto-upgrade) and the automatic advise (auto-advise) features."
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html
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