If you on an early stage of your Network Engineering career, learning following things will immensely help You to get up to the speed with real world requirements/skills.
1. Learn about different optical fibers types and subtypes - Single Mode vs. Multi-mode, OS vs. OM specifications.
2. Learn about different Optical & Optical to Ethernet SFP types, Distance they cover, Speeds they offer, Connector types they got.
3. Learn the internal architecture of a Router at least at high level if not deep.
4. Learn at least basics of ASICs and their high level differences among chip makers.
5. Pick early on "Overlay Protocols" such as - GRE, VxLAN & Geneve fundamentals as they seems to be all around in 2021.
6. Pick on fundamentals of "MPLS" - You will need that pretty much everywhere despite being in Enterprise or SP.
7. Learn about fundamental building blocks of Coding - Don't focus on Networking application of it to keep it clean at the beginning.
8. Learn & Practice "Kepner Tregoe problem solving technique"
HTH...
A Network Artist 🎨
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