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Networking Foundations: Networking Basics

Understanding Layer 3: The network layer

From the course: Networking Foundations: Networking Basics

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  • Course details

    Understanding the foundations of networking is paramount for any IT professional. This course covers the very basics. Professor of computer science Tim Pintello introduces the core networking topologies and implementation examples. He will also explain and compare the OSI and TCP/IP models, and introduce viewers to commonly used network devices, such as NICs, hubs, switches, and routers.


    • Click here to view Timothy Pintello’s instructor page

      Timothy Pintello

      College professor at Daytona State College

      Timothy Pintello is a computer science professor at Daytona State College and a former system administrator.

      Timothy is an associate professor and assistant chair of networking at the School of Computer Science at Daytona State College. He is also the author of the networking textbook Introduction to Networking with Network+. Prior to becoming a college professor, he worked in the telecommunications industry as first a network support specialist, then an IT analyst, and finally as a systems administrator. In his spare time, he enjoys scuba diving and underwater photography.

    Skills covered in this course

  • Welcome

    - Layer three, or the network layer, is the layer I would like to talk about next. The network layer controls the operation of the subnetwork it is located on. Part of controlling the operations of the subnetwork it is located on, is determining the best physical path for data to take in order to reach its destination. The network layer can use several different metrics to do this. One such metric is the condition of the chosen path. In other words, the network layer is able to look at conditions on the networks, such as congestion, whether a node is down, whether there's a lot of traffic, things like that, to help determine, or help choose the best path that a data packet can take to get to where it needs to go. Another way that the network layer can determine the best path is to look at the priority given to different paths on the network, and then, based on the priority, the network layer is then able to choose which path works best for a given packet. Finally, the network layer is…

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