[CentOS] question on how yum updates cache

[Rogelio]

I'm trying to make sense of CentOS's package management based on what
(little) I know about Debian's.

When I do a "yum install program" and it takes forever, is it updating local
cache to install the most up-to-date version of that program?  When I do it
in Debian, it seems to install whatever version is in the "apt-cache"
(unless I "apt-get update").
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