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Session Layer: Software layers ^Is responsible for establishment of connection, authentication and security between the devices.

  • Transport Layer: Heart of OSN model. End to end delivery of the complete message.

  • Network Layer: Transmission of data from one host to the other if both of the devices are located at different networks.

  • Data Link Layer: With the data link layer is responsible for node to node delivery of messages in physical layer.

  • Physical Layer Hardware layers ^: responsible for actual physical connection between devices. It carries information in bit format. It has certain functions. It has certain functions such as bit synchronization, bit rate control.

    Firewall functions


    • accept information: Allows traffic.

    • reject information: rejects traffic with a report.

    • gateways: rejects traffic without giving a message.

    IP (Internet protocol)


    • Public IP: Dynamic. Changes every time you connect to the internet.

    • Private IP: Static.

    • ipv4: Previously established internet protocol. First version of ip. It uses 32 bit address scheme which means it has 4 billion addresses. Only has numbers.

    • ipv6: latest version of ip which is more secure because it uses 128 bit address Scheme. Has Hexadecimal values.

    • DNS: domain name.

    TCP/IP architectures

    TCP

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