Use SSH to communicate with the management port.What is the key length of the default RSA key? 2048?
How do I change the key length of an RSA key
The version of JUNOS is version 15.1X49-D170.4.
Default RSA key length is 2048. You can verify it using below commands:
ssh-keygen -lf /etc/ssh/ssh_host_rsa_key
To change key length:
ssh-keygen -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key