Collision Domains
In expanding an Ethernet LAN, to accommodate more devices with more bandwidth
requirements, you can create separate physical network segments called collision domains
so that collisions are limited to a single collision domain, rather than the entire network.
In traditional Ethernet segments, the network devices compete and contend for the same
shared bandwidth, with all devices sharing a command media connection, only one single
device is able to transmit data at a time. The network segments that share the same
Collision
Hub
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Understanding the Challenges of Shared LANs 143
bandwidth are known as collision domains, because when two or more devices within that
segment try to communicate at the same time, collisions can occur.
You can, however, use other network devices, operating at Layer 2 and above of the OSI
model, to divide a network into segments and reduce the number of devices that are
competing for bandwidth. Each new segment, then, results in a new collision domain. More
bandwidth is available to the devices on a segment, and collisions in one collision domain
do not interfere with the operation of the other segments.
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