NCM can be configured to use SSH to communicate with nodes and issue commands to them, download or upload configuration files, and more.
SSH version 2 is recommended for security concerns, since version 1 has been publicly compromised. (See: https://www.google.com/search?q=ssh+version+1+vulnerabilities&rlz=1C1SQJL_enUS804US804&oq=ssh+versio...)
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