Mac address flooding definition
MAC ADDRESS FLOODING DEFINITION PC
Lets say a brand new switch is plugged into PC A and PC B, with mac addresses of and, and neither of those are in its MAC table yet because neither PC has transmitted Data. I am going to break this down so it is straight forward on how the MAC address table is built, and how this leads to the decision by the switch to either flood / filter / forward a frame that it receives. Bandwidth increased theoretically to 200 mbps (100 up / down).
VLAN’s are used to break up Broadcast Domains, but that is for later.By default, all ports of a Switch are in the same Broadcast domain.Every port on a switch is considered its own separate Collision Domain.I’d like to break this up in bullet points so they really stand out: I agree, lets shift gears, because Switching introduced a mega change to Data Transmission. WELL ALL THIS IS FINE AND GOOD, BUT WHAT ABOUT SWITCHING ALREADY? However, times have changed, and the only place you will hopefully see a Hub is on your CCNP SWITCH exam as a gotcha, which you will now be prepared for! This is what CSMA/CD did, it was an algorithm you might say to detect data transmission, and backoff when collisions occurred on the shared medium (wire). When a Data Collision occurred or was sensed by a change in voltage on the line, all nodes would produce a Jam signal on the ‘line’ and invoke a random backoff timer before attempting to transmit data again, which with being random it wasn’t very likely that two timers would be the same and collisions would continue. In English that means each node “listened” to its cable or ‘wire’ for any other nodes transmitting data, because they all used one shared media via the Hub, so only one Node on the network could transmit data at one time which lead to Data Collisions. Carrier Sense Multi-Access Collision Detection. Lets start from the verrrrry beginning of Switching time, when Dinosaurs roamed the internet.įirst came the Hub (and Bridge) that acted as one single Collision and Broadcast domain, so all nodes on the network used essentially a shared medium, which was made possible by something called CSMA/CD.