DNS: Master=Pri, Slave=Sec?

Sometimes, I see Master/Slave. Sometimes I see Pri/Sec.

Do I set up Master Zone in Pri and Slave in Sec?

Or I can set up master in both Pri and Sec?

From godaddy.com, they only require to enter 2 NS servers without telling which is Pri and which is Sec. I am thinking to set both servers as Pri using Master Zone only.

I see there are a lot more in slave than in master.
In Slave zone.
What is zone "0.168.192.in-addr.arpa" for?

/*
zone "example.com" {
type slave;
file "s/example.com.bak";
masters {
192.168.1.1;
};
};

zone "0.168.192.in-addr.arpa" {
type slave;
file "s/0.168.192.in-addr.arpa.bak";
masters {
192.168.1.1;
};
};
*/

 

 

 

 

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