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Probable typo in slide 2.26 (VLANs)

Hello, this is my first post here, I'd like to mention an error/typo(?) in slide 2.26 dealing about vlans.
In the last paragraph, here is the following sentense :
"Configure the trunk port for switch-to-switch communication and encapsulation. An option, pfSense, may be available to help propagate the configuration to other switches."
What has 'pfSense' to do here ? please correct if I'm wrong, or provide the correct keyword, I'm not sure what is the right word to use here.
Thanks in advance,
Best Regards,




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