Will Fedora's yum update install a "current" or beta version of the kernel and cause problems?

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http://unix.stackexchange.com – Short question is: should we always do a yum update --exclude=kernel-* to do an update in Fedora? I was a bit surprised that when I got a new Fedora machine at work (it used to be Red Hat Enterprise Linux (RHEL)), the first time it started up, it asked me to do an update, and I naturally said yes, and for anything it asked, I just used the default answer (usually replying "yes" by pressing ENTER). But it turned out that the kernel was somehow corrupted, having 3.6.9 and 3.6.10 components, and the machine would not boot up, and had to use the second option to boot up in the boot menu. (the IT (HowTos)