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.
Figure 1: Traditional LAN Segmentation
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.
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.
Only a single router is shown for simplicity. One or more
routers may be used for routing interVLAN traffic.
Figure 3: Logical View of VLANs