From the course: Cisco Networking Foundations: Fundamentals of Cisco Networking

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CSMA/CD vs. CSMA/CA

CSMA/CD vs. CSMA/CA

From the course: Cisco Networking Foundations: Fundamentals of Cisco Networking

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CSMA/CD vs. CSMA/CA

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- [Instructor] Consider this topology. Now, it's unlikely that you would see a topology like this today, but back in the late eighties, when I first started working with networks, this is exactly what we had. It's called a bus topology. Specifically, we had an ethernet bus and we used the long coaxial cable, not really the same thing, but somewhat similar to what you might have with your cable TV connection. And this coaxial cable, it weaved its way from one room to the next. And in order to connect the device into the network, we would tap into that cable. Now, here we have three devices. We have PCs one and two and a server and let's say PC one wants to send data to the server. In a bus topology, only one frame of data can be on the wire at any time. So first, PC one listens to the wire to see if there's any traffic currently on the wire. And if the coast is clear, PC one transmits its frame up to the server.…

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