I recently earned my CCNA, but I still feel very uncomfortable with WAN technologies. I'm pretty comfortable with LAN stuff like IGPs, switching, etc. but I feel like MPLS, IPsec, GRE tunnels, EoMPLS, and the like are my major weak points right now, and it's definitely worrying me a bit. I feel like a lot of explanations I've seen cut out a lot of details with a big drawing of a cloud in between LANs, so that kind of obscures things, but maybe I'm looking into it too deeply. Any recommendations for resources to learn about WAN technologies in detail would be greatly appreciated!
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