How many collision domains are there in the following diagram?
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A collision domain is, as the name implies, the part of a network where packet collisions can occur. A collision occurs when two devices send a packet at the same time on the shared network segment. The packets collide and both devices must send the packets again, which reduces network efficiency. Collisions are often in a hub environment, because each port on a hub is in the same collision domain. By contrast, each port on a bridge, a switch or a router is in a separate collision domain. Show The following example illustrates collision domains:  We have 6 collision domains in the example above. NOTE Broadcast domainA broadcast domain is the domain in which a broadcast is forwarded. A broadcast domain contains all devices that can reach each other at the data link layer (OSI layer 2) by using broadcast. All ports on a hub or a switch are by default in the same broadcast domain. All ports on a router are in the different broadcast domains and routers don’t forward broadcasts from one broadcast domain to another. The following example clarifies the concept: In the picture above we have three broadcast domains, since all ports on a hub or a switch are in the same broadcast domain, and all ports on a router are in a different broadcast domain. Download our Free CCNA Study Guide PDF for complete notes on all the CCNA 200-301 exam topics in one book. We recommend the Cisco CCNA Gold Bootcamp as your main CCNA training course. It’s the highest rated Cisco course online with an average rating of 4.8 from over 30,000 public reviews and is the gold standard in CCNA training:
How many collision domains are there?So, There are 2 broadcast domains & 5 Collision domains.
How many collision domains are there in bridge?A bridge has two ports and two collision domains, and it connects network segments together. Each segment typically has multiple nodes, and the bridge learns the MAC addresses of nodes on either side.
How many collision domains are there in switch?The switch creates 12 collision domains and 1 broadcast domain.
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