1. Native VLAN Assist. Prof. Pongpisit Wuttidittachotti, Ph.D. Faculty of Information Technology King Mongkut's University of Technology North Bangkok (KMUTNB)

2. http://www.google.com/imgres?imgurl=http://images.books24x7.com/bookimages/id_35326/px130301.gif&imgrefurl=http://www.r ealmagick.com/ieee-8021q-native-vlan/&h=237&w=500&tbnid=9uAuHa7- VaIioM:&zoom=1&docid=PQ1OzR_q5vqL0M&itg=1&ei=HKtEVb70AsS3uAS444DoCg&tbm=isch&ved=0CCYQMygKMAo

4. In 802.1q encapsulation, there is a concept called native VLAN that was created for backward compatibility with old devices that don’t support VLANs. Native VLAN works as follows: + Frame belonging to the native VLAN is not tagged when sent out on the trunk links + Frame received untagged on the trunk link is set to the native VLAN. So if an old switch doesn’t support VLAN it can still “understand” that frame and continue sending it (without dropping it). Every port belongs to at least one VLAN. If a switch receives untagged frames on a trunkport, they are assumed to be part of the native vlan. By default, VLAN 1 is the default and native VLAN but this can be changed on a per port basis by configuration. http://www.9tut.com/virtual- local-area-network-vlan-tutorial

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6. http://www.thaiadmin.org/board/index.php?PHPSESSID=k7uoothm9269g1op3hrphvb eg2&action=dlattach;topic=87224.0;attach=47192;image

7. Understanding Native VLAN in 802.1Q Trunking 802.1Q trunks define a native VLAN for frames that are not tagged by default. Switches transmit any Layer 2 frames from a native VLAN on the trunk port untagged, as shown in Figure 2-9. The receiving switch forwards all untagged packets to its native VLAN. The native VLAN is the default VLAN configuration of the port. When the port is not trunking, the access VLAN configuration defines the native VLAN. In the case of Cisco switches, the default native VLAN is VLAN 1, and you can configure any other VLAN as the native VLAN. http://ciscodocuments.blogspot.com/2011/05/chapter-02-implementing-vlans-in-campus_19.html