Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

0x400. NETWORKING > 0x430. Peeling Back the Lower Layers

Peeling Back the Lower Layers

When you use a web browser, all seven OSI layers are taken care of for you, allowing you to focus on browsing and not protocols. At the upper layers of OSI, many protocols can be plaintext since all the other details of the connection are already taken care of by the lower layers. Sockets exist on the session layer (5), providing an interface to send data from one host to another. TCP on the transport layer (4) provides reliability and transport control, while IP on the network layer (3) provides addressing and packet-level communication. Ethernet on the data-link layer (2) provides addressing between Ethernet ports, suitable for basic LAN (Local Area Network) communications. At the bottom, the physical layer (1) is simply the wire and the protocol used to send bits from one device to another. A single HTTP message will be wrapped in multiple layers as it is passed through different aspects of communication.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free 10-Day Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint