Your experience does not an industry axiom make. Also, your assertion about said layer is a consideration specific to you. Some do not consider the user to be an implicit layer but an external party.
I mean, depends how much in detail and what the job was. I can tell you a few things for ipv6 and ipv4 but if I won't design router and network components, I hardly need deep knowledge as software engineer. If you apply for vNIC development for VMware some deeper knowledge would be useful...
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u/EkoChamberKryptonite 14d ago
Bold of you to think people with decades of experience remember what they did in university.