is password required to extract certs and mac

[earth890]

Hello,

I am newbie.  

Couple questions, please help.

1. Is login password to modem required in order to extract certs and mac? using the tool JTAG utility and cmnonexpv
2. in order to use JTAG utility, do i have to buy JTAG hardware component and solder it to modem? what is JTAG component to use with sb6141? may i have link please.
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

1) Yes
2) Yes
3) No
4) the entire contents of the memory

thank you for the answers
your answer to first question is different than other's answer. 
I see people saying blackcat JTAG, and i found this on ebay, does this one work as well? it is cheaper than USBJTAG. 
Is JTAG hardware component detachable? do i need to solder and desolder every time on different modem? thank you so much