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What are the differences between SPAN and TAP?

The differences between SPAN and TAP are that SPAN is mirroring traffic while TAP is passively capturing it.

What types of network devices can support network traffic mirroring?

The types of network devices that can support network traffic mirroring are switches and hubs

How can network traffic mirroring be used for network security?

It can be used for network security by being able to monitor incoming and outcoming traffic making sure that nothing malicious is going on.

Are there any legal or ethical considerations when using network traffic mirroring?

Yes, you need to have permissions to perform network traffic mirroring or else it is considered illegal.

Source: How to capture network traffic? SPAN vs TAP

What I would like to know more about.

I would like to know more about traffic mirroring and seeing if there are other ways that could be more efficient.