A Virtual Local Area Network (VLAN) allows a logical segmentation of a Local Area Network (LAN) into different broadcast domains.
VLANs behave much like physical LANs, but you can group hosts even if they are not physically co-located.
VLANs can be used to enhance security by segmenting a broadcast to a specific VLAN.
Traffic from VLAN 5 is logically separated to VLAN 10.
A good understanding of VLAN concepts is mandatory for a proper LAN architecture. It is one of the core concepts together with Port Types (Access ports, 802.1q Trunk Ports and Dynamic Ports), Trunking (DTP, Native VLAN) for a basic connectivity
Below is the list of Tutorials which one needs to add into his arsenal of tools for a proper understanding.
Access and Trunk with DTP - • Configuration Pratique d'un Access, T...
VLAN, VTP configuration - • Cisco VLAN, VTP (VLAN Trunking Protoc...
How to ping multiple IP addresses at once on a Cisco device - tcl script - • How to ping multiple IP addresses at ...
DHCP - • Configuration de DHCP sur un Switch C...
EtherChannel - • Configuration Pratique d'EtherChannel...