CCNA™: LANs and VLANs

Traditional LAN segmentation: Using traditional LAN segmentation, all the segments will be in the same broadcast domain. This effectively, reduces the efficiency of the network. A traditional LAN segmentation is shown below.

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Figure 1: Traditional LAN Segmentation

VLANs: Using VLANs, the broadcast domain gets divided into the number of VLANs. If there are three VLANs, as shown in the figure, the broadcast domain will be split into three.

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Figure 2: Segmentation using VLANs

Logical View: Given below is the logical view of segmentation using VLANs. Note that a router is required to route traffic between VLANs, and each VLAN is in different broadcast domain.

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Figure 3: Logical View of VLANs

Only a single router is shown for simplicity. One or more routers may be used for routing interVLAN traffic.

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