Hello. I took my CCNA courses in univeristy a few years ago but I seem to have forgotten things. I started a new job in networking. I'm comfortable configuring interfaces, VLANs, BGP and stuff like that but some basic troubleshooting and verifying knowledge seems to be lost on me. Like checking if other (edge) routers are receiving default routes, are the networks being advertised etc.
Does anyone have a source for good materials on these kinda topics?
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