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I am quite confused after doing some research online regarding designated port selection. It looked like to me that each port segment has a designated port and a blocked port? If you look at the diagram (S3) you can see that there are three segments that don't contain a blocked port... how is this possible?

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    Commented Dec 23, 2021 at 20:05

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If the port is not the root port, and it has a better (lower) cost than the received BPDU, the port is designated, otherwise it’s blocked.

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