Cisco CCNP examination Tutorial: Defining Collision Domains
CCNA exam success depends on mastering the fundamentals, and 2 important fundamentals are understanding exactly what the terms “collision domain” and “broadcast domain” mean. In this free barullo tutorial, we’ll take a look at the term “collision domain” and how the collision domain is described.
A collision domain is an area in which a collision can occur. Fair enough, but what “collision” are usually we talking about here? we are going to talking about collisions that happen on CSMA/CD segments, or even Carrier Sense Multiple entry with Collision Detection. in case two hosts on an ethernet, segment transmit data in exactly the same time, the data from the two hosts will clash on the shared segment. CSMA/CD exists to lessen the chances of this particular happening, but collisions can still occur. To lessen the chances of accidents occurring, we may decide to produce multiple, smaller collision domain names.
Let’s say we have four hosting companies on a single Ethernet segment. The entire segment is a collision domain name; any data sent simply by one of the hosts can clash with data sent simply by any of the other hosts. We have one collision domain that contains four devices.
To create smaller sized collision domains, we’ll need to introduce some type of networking gadget into this example. Hubs and repeaters have their location as far as extending the achieve of a network segment plus cutting down on attenuation, but these OSI Layer One devices do nothing to define collision domain names. We could connect each sponsor into a separate port on a centre (a hub is basically the multiport repeater) and we would still have one single collision domain name with four hosts in it.
The most common and most effective way to create multiple collision domain names is to use a switch. If we connect each of these four hosting companies to their own separate change port, we would now have 4 separate collision domains, every with one host; every switch port actually acts as a single collision domain, producing collisions between these 4 hosts impossible.
Passing the particular CCNA is all about knowing the details of how things work, plus knowing CSMA/CD theory and how to define collision domains is one of the many details you’ve got to learn. In the next part of this CCNA tutorial, we’ll take a look at transmit domains, and how defining transmit domains in the right locations can dramatically cut down on unneeded traffic on your network.
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