I know that most of the cisco cetification has a valid period, i.e. CCNA is valid for 3 years. Does this period really affect your job. I means if I apply a job using a CCNA cert that already epired a year or so, do the employer really take this into account? Or, If i already work as a network engineer that required CCNA, after my CCNA expired, will my boss say, " Hey, you are not a CCNA anymore, pack you things and go home." Or they just don't care cause you already have the required skill, the validity of the cert is not important anymore.
What is done is done, what yet to be done will be done. While in the process of doing, enjoy it.