Question: The permissions on the linux file /etc/shadow is set so that it cannot be read by unprivileged users. Why? When is it best to use

The permissions on the linux file /etc/shadow is set so that it cannot be read by unprivileged users. Why? When is it best to use a host firewall (e.g. ufw)? When is it best to use a network firewall (e.g. pfSense).

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