Linux Certification

Hi,

Anybody know the easiest and the best vendor that provide certification
in linux? I am interested in these 4: RedHat, Sair, CompTIA, and LPI.
I am also wondering what title they put on the certificate, and wheather
it has expiry date. (Title like "Certified Linux Professioal", for
example, is nicer that "Junior Linux SysAdmin" or "Linux SysAdmin Level
1").
Pardon me if this is not the right group to post such question.

Thanks,
Edi
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