Chap 8
VLAN - 1. logical grouping (of ports) on a switch
            2. (create) broadcast domains
            3. (increase) security

Configure: 1. define VLAN number (vlan database)
                 2. assign a port to a VLAN [(-if)#switchport access VLAN <#>]
Remove: A. delete entire VLAN (all ports asssociated with that VLAN
                   become orphans)
               B. unassign individual port from a VLAN, it gets back to VLAN1
                   (-if)#no switchport access VLAN <#>)

Chap 9
Trunk: share all traffics on one link (or shared links)
Identify VLAN ID: (1) Frame filtering - like switching table or routing table
                           (2) Frame Tagging - put a label when getting into trunk;
                                 (IEEE 802.1Q)   remove it when getting off trunk
                           (3)ISL: Add another 26Bytes header and recalculate the CRC
                                      (encapsulation)
Configure: 1. assign a port as trunk
                 2. define encapsulation type (dot1q or isl)

VTP roles: Server: create/remove/accept VLANS
	 Client: accept/forward VLANS
	 transparent: forward VTP information; Local (non-VTP member) VLANS

Configure VTP: 0. power cycle the switch
	         1. assign the version number (1 or 2)
                         2. specify domain name
                         3. choose the VTP mode (server, client, or transparent)
                         4. password

Configure on a router interface:
(sub interface)
     int Fa0/0.1
	encap dot1q <VLAN ID>
                ip address  192.168.1.0/24
    int Fa0/0.2
                encap dot1q <VLAN ID>
                ip address 192.168.2.0/24