is password required to extract certs and mac

Hello,

I am newbie.   Image may be NSFW.
Clik here to view.

Couple questions, please help.

1. Is login password to modem required in order to extract certs and mac? using the tool JTAG and cmnonexpv
2. For a working sub modem, if i extra cert and mac, will this modem become unusable?
3. I see people saying full dump, what is dump? 

Thank you