ICND2 Quick Reference Guide
Section 1. VLANs and Trunk Links
VLANs and Trunks
The virtual LAN (VLAN) organizes physically separate users into the same broadcast domain. The use of VLANs improves performance, security, and flexibility. The use of VLANs can also decrease the cost of arranging users, because no extra cabling is required.
VLAN Characteristics
VLANs allow logically defined user groups rather than user groups defined by their physical locations. For example, you can arrange user groups such as accounting, engineering, and finance, rather than everyone on the first floor, everyone on the second floor, and so on. Some defining VLAN characteristics are as follows:
VLANs define broadcast domains that can span multiple physical LAN ...
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