CISCO refresh sheets

I have been away from Cisco switches/routers for quite a while. What material do you recommend to read for a quick refresh ?
Thank you !
Claws HoEngineerAsked:
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Fadi SODAH (aka madunix)Connect With a Mentor Chief Information Security Officer, CISA, CISSP, CFR, ICATE, MCSE, CCNA, CCNP, CCIP, SCSC and SCECommented:
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JustInCaseConnect With a Mentor Network EngineerCommented:
Also for quick refresh of concepts - CBT nuggets.
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