rndc increment the serial

[fakessh @]

hello bind network , guru and other


since I installed the latest version of bind 9.7.3 
I do not know me use rndc 
rndc to each use is increment a serial in the area. 
I do not remember using it. 


can you give me a little explanation
-- 
gpg --keyserver pgp.mit.edu --recv-key 092164A7
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7
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