Cisco CCNA Certification

When you're studying to pass the CCNA test and make your certification, you're introduced to a great many terms that are either absolutely new to you or appear familiar, however you're not quite sure what they are. The term "collision domain" falls under the latter classification for many CCNA candidates.What precisely is" clashing "in the very first place, and why do we care? It's the data that is being sent onto an Ethernet section that we're worried about here. Ethernet utilizes Carrier Sense Several Gain Access To/ Collision Detection (CSMA/CD) to avoid crashes in the first place. CSMA/CD is a set of guidelines determining when hosts on an Ethernet segment can and can not send information. Basically, a host that wishes to send information will "listen" to the ethernet segment to see if another host is presently transmitting. If nobody else is transmitting, the host will move forward with its own transmission.This is an effective method of avoiding a crash, but it is not sure-fire. If two hosts follow this treatment at the exact same time, their transmissions will collide on the Ethernet section and both transmissions will end up being unusable. The hosts that sent out those 2 transmissions will then send a jam signal out onto the sector, suggesting to all other hosts that they should not send out data. The two hosts will each begin a random timer, and at the end of that time each host will start the listening process again.Now that we

know what a crash is, and what CSMA/CD is, we require to be able to define an accident domain. A collision domain is any location where a crash can in theory occur, so just one gadget can send at a time in an accident domain.In another

complimentary CCNA certification tutorial, we saw that broadcast domains were specified by routers (default) and switches if VLANs have been specified. Hubs and repeaters did nothing to define broadcast domains. Well, they don't do anything here, either. Hubs and repeaters do not define accident domains.Switches do, however. A

Cisco switchport is in fact its own unshared crash domain! For that reason, if we have 20 host devices linked to separate switchports, we have 20 accident domains. All 20 devices can send simultaneously without any risk of crashes. Compare this to hubs and repeaters- if you have five gadgets connected to a single hub, you still have one big crash domain, and only one device at a time can transmit.Mastering the definition and creation of collision domains and broadcast domains is an important step towards making your CCNA and becoming a reliable network administrator. Best of luck to you in both these worthwhile pursuits!

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