I have a topology here if I can bring it live ‑‑ let’s say that I have two IP endpoints and you’ll notice that they are both plugged in to a switch. I’m going to have a problem in the fact that I feel like I’m talking to myself. However, what if the MAC address that that other endpoint has is exactly the same as mine? I say, “Who’s the IP address that has this MAC address?” They reply back to me, and all is well. That means in order for me to ping that device, I have to determine that device’s MAC address. Let’s say I’m a PC and I have another PC next to me that is in the same network that I’m in and I want to communicate with it. What issues arise if there are duplicate MAC addresses? Instructor Mark Jacob was presenting a Q&A Session in our ICND1 CCNA class and answered a question regarding MAC Addresses and when they get associated to devices.
This post is from our Cisco CCNA Training Course.
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