which statement is more accurate about a trunk link? (1 or 2)

Unanswered Question
Apr 6th, 2007

1- A trunk link connects multiple devices on a single subnet to a switch port.

2- The native vlan of the trunk link is the vlan to which a port will belong if that link becomes non-trunk

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Danilo Dy Fri, 04/06/2007 - 23:42

A trunk link transports traffic for multiple VLANs across a single physical link. Trunks encapsulate Ethernet frames with other information to support the multiplexing technology employed.

scottmac Sat, 04/07/2007 - 06:46

Number two is the most correct, though still not really accurate.

The key "feature" of the native VLAN is that the traffic is untagged. If a trunk becomes a non-trunk, then there is only one broadcast domain ... and it won't have any indication of vlan membership.

VLANs are created and implemented at the switch (or router). Tags are stripped at the egress of a switchport/accessport.

If the ports somehow stop being a trunking pair, then all traffic they produce will be untagged in a single broadcast domain .... there is no "native" vlan ... there's not even a VLAN .... just a link between two switchports/accessports.

It's a really bad question. Ignore it.

Good Luck



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