Should trunk ports be tagged or untagged?

The purpose of a tagged or “trunked” port is to pass traffic for multiple VLAN’s, whereas an untagged or “access” port accepts traffic for only a single VLAN. Generally speaking, trunk ports will link switches, and access ports will link to end devices.

What is a trunk link?

A trunk link is the other type of Layer 2 port supported on Cisco switches. When a trunk port is configured, it begins marking frames as they exit the port to indicate which VLAN each frame is associated with. The trunk port can also read the markings, called tags, as they enter the trunk port.

Is native VLAN tagged or untagged?

In Cisco LAN switch environments the native VLAN is typically untagged on 802.1Q trunk ports. This can lead to a security vulnerability in your network environment. It is a best practice to explicitly tag the native VLAN in order to prevent against crafted 802.1Q double-tagged packets from traversing VLANs.

What is the difference between tagged and untagged ports HP?

tagged – means that packets that have a valid vlan tag for this vlan id will be accepted on this port. packets without vlan tag will not be accepted. untagged – means that if there is packets on this port that have no vlan id set will have their vlan id tag set to this vlan by the switch.

What is VLAN configuration?

VLANs (Virtual LANs) are logical grouping of devices in the same broadcast domain. VLANs are usually configured on switches by placing some interfaces into one broadcast domain and some interfaces into another. Each VLAN acts as a subgroup of the switch ports in an Ethernet LAN.

What is untagged and tagged VLAN?

Difference Between VLAN Tagged vs Untagged. Tagged VLANs: Comes to Tagged VLAN; it is slightly different by connecting multiple VLANs into a single port. The frame contains the destination address tag, so a single port can be established to accomplish the connection between the two switches.

What is trunk port in Cisco switches?

A trunk port is by default a member of all the VLANs that exist on the switch and carry traffic for all those VLANs between the switches. To distinguish between the traffic flows, a trunk port must mark the frames with special tags as they pass between the switches.

What is the difference between VLAN and native VLAN?

When frames traverse a Trunk port, a VLAN tag is added to distinguish which frames belong to which VLANs. Access ports do not require a VLAN tag, since all incoming and outgoing frames belong to a single VLAN. The Native VLAN is simply the one VLAN which traverses a Trunk port without a VLAN tag.