Why do we tag VLANs?

Virtual Local Area Networks, or VLANs, segregate traffic within a network. VLANs keep traffic from different networks separated when traversing shared links and devices within a topology. This process, also known as VLAN tagging, is invaluable to limiting broadcast network traffic, and securing network segments.

What is 802.1 Q used for?

802.1Q tunneling enables service providers to use a single VLAN to support customers who have multiple VLANs, while preserving customer VLAN IDs and keeping traffic in different customer VLANs segregated. A port configured to support 802.1Q tunneling is called a tunnel port.

Can I tag VLAN 1?

In FTOS VLAN 1 is the default VLAN and is untagged on all ports. The default VLAN cannot be tagged on any interface in FTOS platform. In order to change the default VLAN ID on the switch to any VLAN ID from 1-4094 it should not be present in the VLAN database of the switch.

When to use tagged, untagged, and native VLANs?

Most switch ports will use this mode by default, with VLAN ID 1. When a frame leaves an untagged port, the switch strips the VLAN tag from the frame. The traffic is then forwarded as normal. The following diagram shows this process: The traffic flows like this: Host A sends traffic to the switch. The traffic does not have a VLAN tag

How to set a VLAN tag in Windows?

How do I set a virtual local area network (VLAN) tag with my network card in Windows? Virtual local area network (VLAN) tagging requires that the network interface card (NIC) and the router or switch that you use support protocol IEEE 802.1q. Depending on the NIC, you can set your VLAN ID in Device Manager.

Why are Ethernet VLANs tagged with 802.1Q?

The port between router and switch is configured as a trunk port so that both router and switch know which packet belongs to which customer VLAN. On that port the Ethernet frames are tagged with the 802.1Q tag.

Can a tagged packet be pinged from a different VLAN?

Scenario #2: Tagged Packet Sent From/Received on Tagged port. In this scenario, PC1-20 will ping PC2-20. Since these devices are on the same VLAN, communication will be permitted. However, since they are on different switches, the packets will need to be tagged on the trunk link between Switch1 and Switch2.