Extra VLAN Notes

Question 1

IEEE 802.1q Standard

Answer 1

Networking standard that supports VLANs on an ethernet network

Defines a method of tagging traffic between two switches to tell which traffic belongs to which VLAN

Question 2

Trunk

Answer 2

Provides VLAN ID for frames traversing between switches

Without Trunking:
VLANs are local to each switch (VLAN info is not passed between switches)

Can also be configured between a switch & router
By default, trunks can carry traffic from all VLANs to/from the switch
Can be configured to carry specific VLAN traffic

Question 3

Trunking

Answer 3

The process of traversing different VLAN traffic over the trunk

Question 4

Trunk Port/Tagged Port

Answer 4

The switch ports used for the trunk link (specially configured)
Adds VLAN tags to ethernet frames to indicate the VLAN the frame belongs to

Question 5

Access Port/Untagged Port

Answer 5

A switch port that sends & expects to receive traffic with no VLAN tag
Carries traffic for only 1 VLAN

Question 6

Default VLAN / VLAN1

Answer 6

By default, the access port belongs to VLAN 1
Cannot change or delete the default VLAN

Question 7

Native VLAN

Answer 7

A special VLAN whose traffic traverses on the 802.1q trunk without a VLAN tag

Native VLAN is VLAN1 by default

Can be changed to any other number
Change to another VLAN for better security
Otherwise prone to VLAN hopping attack

Can be configured on the trunk port
Native VLAN needs to be the same on both ends of the trunk