This post is from our Cisco CCNA Training Course. 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. Transcription: What issues arise if there are duplicate MAC addresses? MAC addresses are important. Let’s say I’m a PC … Continue reading What Happens when there are duplicate MAC Addresses. How many MAC Addresses can a Switch learn?
So you are troubleshooting the network and PING from one device to another. A reply is received. Great! Connectivity has been restored. But what happened behind the scenes? As long as the two devices are on the same network or subnet, the proof of connectivity never really has to live above Layer 2 (the Data Link layer) of the … Continue reading Deciphering Layer 2 devices and the ARP process