You don't need to memorize every OSI layer, but you DO need to
know which layer your problem is on:
L2 — Ethernet, MAC addresses L5 — Sessions
L3 — IP, routing L6 — TLS / encoding
L4 — TCP / UDP, ports L7 — HTTP, gRPC, DNS
HTTP runs on which layer?
A) L3 (network) B) L4 (transport) C) L7 (application) D) L2 (data link)
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