api: YAML JSON TOON Database
version: 1.0.0
format: toon
dataset:
  id: 2866
  slug: osi-model-layers
  title: OSI Model Layers
  description: The seven layers of the OSI reference model.
  summary: "The seven layers of the OSI reference model, numbered from the physical layer (1) up to the application layer (7), each with its function and example protocols. It is the shared vocabulary for saying where in the stack a device, protocol or fault belongs."
  use_when[2]: "You need the numbering and names of the layers, for example to explain what a 'layer 7 firewall' or 'layer 2 switch' does.",You are teaching or troubleshooting by working up or down the stack.
  caveats[2]: "OSI is a reference model. TCP/IP, which the internet runs on, groups the upper three OSI layers into one application layer.","Many protocols do not sit cleanly in one layer; TLS, for example, is placed at layer 6 or 5 depending on who is drawing it."
  related[3]: tcp-ip-protocol-suite,network-topologies,network-security-devices
  entry_count: 7
  fields[4]{section,field,type,example}:
    data,layer,integer,"7"
    data,name,string,Application
    data,function,string,Network services for applications
    data,example_protocols,string,"HTTP, FTP, SMTP, DNS"
  category: Networking
  category_slug: networking
  tags: "networking,osi,protocols"
  view_count: 37
  created_at: 1793403093
  updated_at: 1793403093
data[7]{layer,name,function,example_protocols}:
  7,Application,Network services for applications,"HTTP, FTP, SMTP, DNS"
  6,Presentation,"Data translation, encryption, compression","SSL/TLS, JPEG, ASCII"
  5,Session,Manages sessions between applications,"NetBIOS, RPC"
  4,Transport,End-to-end communication and reliability,"TCP, UDP"
  3,Network,Logical addressing and routing,"IP, ICMP, OSPF"
  2,Data Link,Node-to-node framing and media access,"Ethernet, PPP"
  1,Physical,Raw bit transmission over media,"USB, Ethernet cables, radio"