01
Front
What does a VLAN trunk do?
Back
A VLAN trunk carries traffic for multiple VLANs across one Ethernet link, such as a link between switches.
Free Online Flashcard Deck
2 Trunking and VLAN Transport Free Online FlashCards
Study 2 Trunking and VLAN Transport with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
What standard is used for VLAN trunk tagging?
Back
IEEE 802.1Q is the standard tagging method used to identify VLAN traffic on a trunk.
03
Front
What information does an 802.1Q tag carry?
Back
An 802.1Q tag includes a VLAN ID and priority information used for traffic handling.
04
Front
How does a receiving switch use an 802.1Q tag?
Back
The receiving switch reads the tag and forwards the frame within the VLAN identified by the tag.
05
Front
What is the native VLAN on a Cisco trunk?
Back
On Cisco switches, the native VLAN is the VLAN assigned to untagged trunk traffic.
06
Front
What is the default native VLAN on Cisco switches?
Back
VLAN 1 is the default native VLAN on Cisco switches.
07
Front
Why should both ends of a trunk use the same native VLAN?
Back
Configure the same native VLAN at both ends. A mismatch can cause connectivity problems and may contribute to spanning-tree loops.
08
Front
What does a trunk’s allowed VLAN list control?
Back
The allowed VLAN list controls which VLANs can use a trunk.
09
Front
Does adding a VLAN to the allowed list create that VLAN?
Back
No. A VLAN must also exist and be active on the switch for its traffic to be carried.
10
Front
What happens to VLAN 40 traffic if the trunk allows only VLANs 10, 20, and 30?
Back
VLAN 40 traffic will not cross the trunk, even if VLAN 40 exists on both switches.
11
Front
Which example command sets VLAN 99 as the native VLAN?
Back
The command `switchport trunk native vlan 99` sets VLAN 99 as the trunk’s native VLAN.
12
Front
What can `show interfaces trunk` verify?
Back
`show interfaces trunk` displays which interfaces are trunking and which VLANs are allowed and active.
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