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Why SNA is secure?

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I ?m analyzing a network that had two hosts (0S/390) interconnected by a SNA protocol, and i don?t have much information about this technology.
However, some of the IT consultants that I know say me that this protocol is most secure than TCP/IP.
Based on this, I 'd like to comprehend what components make SNA a secure protocol?

Best Regards.
Neife

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by dwasserman

My point of view is:
SNA is not more secure , the operating system (os/390, as400) make it more secure.
SNA is layer 2 protocol

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