WHAT IS OSI MODEL?

  1. Application: End User Layer {HTTP,FTP, IRC,SSH,DNS}
  2. Presentation: Syntax Layer {SSL,SSH,IMAP,FTP,MPEG,JPG}
  3. Session: Synch And Send to Port {APIs,Sockets,WinSock}
  4. Transport: End-to-End Connection {TCP,UDP}
  5. Network: Packets {IP,ICMP,IPSec,1GMP}
  6. Data Link: Frames {Ethernet,PPP,Switch,Bridge}
  7. Physical: Physical Structure{Coax,Fiber,Wireless,Hubs,Repeaters}

1. APPLICATION (layer 7):

At the very top of the OSI Reference Model stack of layers, we find the Application…


  1. HTTP PROTOCOL
  2. WEB FUNCTIONALITY
  3. ENCODING SCHEMES

1) HTTP Protocol

  • HTTP Requests.
  • HTTP Responses.
  • HTTP Methods.
  • URLs.
  • REST.
  • HTTP Headers.
  • Cookies.
  • Status Codes.
  • HTTPS.
  • HTTP proxies.
  • HTTP Authentication.

HTTP Protocol

Hypertext transfer protocol (HTTP) HTTP uses a message-based model in which a client sends a request message and the server returns a response message.

HTTP Requests

The HTTP (requests/responses)message consists of one or more headers.


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FOLDER

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