For some time I've fiddled with Debian and Ubuntu LTS. There's one really nice feature for local networks: apt-cacher, a package proxy for APT. My company is in the remote South French countryside, and more often than not, schools and public libraries only have some very limited Internet access with relatively low bandwidth, which can make the updating process very tedious. A package cache comes in very handy in such situation.
You can also enable keepcache in /etc/yum.conf on one of the servers and after update copy rpms from /var/cache/yum to a (higher priority) local repository. You'll need to use createrepo to generate metadata for the repo.
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