OSI 7-Layer Model

Classic OSI stack with representative protocols at each layer.

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  L7["7 · Application"]:1 P7["HTTP, gRPC, DNS, SMTP"]:1
  L6["6 · Presentation"]:1 P6["TLS, JPEG, ASCII"]:1
  L5["5 · Session"]:1 P5["NetBIOS, RPC"]:1
  L4["4 · Transport"]:1 P4["TCP, UDP, QUIC"]:1
  L3["3 · Network"]:1 P3["IP, ICMP, BGP, OSPF"]:1
  L2["2 · Data link"]:1 P2["Ethernet, ARP, Wi-Fi (MAC)"]:1
  L1["1 · Physical"]:1 P1["Cables, radio, NIC"]:1
classDef layer fill:#dbeafe,stroke:#1e3a8a,color:#0b1220;
classDef proto fill:#ede9fe,stroke:#6d28d9,color:#0b1220;
class L1,L2,L3,L4,L5,L6,L7 layer
class P1,P2,P3,P4,P5,P6,P7 proto