True Meaning of network segments in the Age of bridging and hub networking

When learning "route switching", I saw a lot about the word "CIDR Block.

In the era of hub networking. When learning "bridge", you can see the following statement: the bridge connects two different network segments, or the bridge divides a large network into two small networks. A bridge is a layer-2 device with only two ports. A switch is essentially a multi-port bridge, but when a switch is used for networking, it seldom sees the following statement: the switch connects multiple network segments, or a switch divides a large network into several small networks and other statements. What we can see is the following statement: A vro is used to connect different types of networks, and the vro isolates different network segments.

When learning a VLAN, you often see the CIDR Block statement: a VLAN corresponds to an ip cidr block, and the inter-VLAN routing solves the communication problem between different CIDR blocks.

At the beginning of contact, I still felt dizzy and felt that the network segment was two parts of a network. I could not say what the network segment is. At first, I couldn't say that there was nothing, but when I came into contact with this word more and more, I felt that I had to know what it was, because I found many times. This CIDR block has different meanings, but it cannot be said. In many cases, it may affect your understanding of a certain sentence, therefore, the more I think the importance of understanding this word, especially its multiple meanings, has different interpretations in different environments.

Only now can we know the true meaning of CIDR blocks: in the era of networking bridges and hubs, a CIDR Block refers to a "Conflict domain", while in the era of networking switches and routers, a cidr Block refers to a "broadcast domain ". In modern networks, if a hub exists, there may be two meanings. In short, it depends on the statement environment. A broadcast domain is also called an IP network segment to distinguish the two meanings.

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