Secure connection between two MS510TX

Stefan,

billiloumez wrote:

What worries me is the connection in the tech room in the basement, because the room is not locked. So anyone could just walk in, disconnect my cable and connect something in between.

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Information security does start at the physical access level. 

billiloumez wrote:

Is there any way to securely connect both switches?

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Yes, there are - but these are off $$$ reach for most home, SOHO, or even SMB users. https://www.crypto.com/ -> LINK ENCRYPTION ETHERNET HC-8555 10G  8-)

billiloumez wrote:

My idea is, that both switches somehow authenticate against each other and only if they have a direct and secure connection with nothing in between, there would be any data transfer. Is this possible?

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Anything is possible, however there is nothing in the industry standards for Ethernet interconnections. 802.1x port auth is for edge connectivity only.