Palo Alto Networks Video: Network Models

The Internet is a packet-switched network comprised of hundreds of millions of routers and billions of servers and user endpoints. In a packet-switched network, devices share bandwidth on communications links to transport packets between a sender and receiver across a network. Packet encapsulation is the process of formatting packets from one network structure into another, for example from a wireless network to a wired network. In order to understand the different network models and topologies you will need to have a fundamental knowledge of the Open Systems Interconnect - OSI - model, a basic understanding of how networking standards such as Ethernet 802.3 and WLAN 801.i, and understand how protocol standards such as TCP/IP define their specific frame structures for packets that are defined by a particular protocol, such as HTTP or FTP.

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