01
Front
What does an IEEE 802.1Q trunk carry?
Back
An IEEE 802.1Q trunk carries traffic for multiple VLANs over one Ethernet link.
Free Online Flashcard Deck
3 Trunk Configuration Free Online FlashCards
Study 3 Trunk Configuration with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
How do switches identify most VLAN traffic on a trunk?
Back
Switches identify most frames on a trunk with an 802.1Q VLAN tag.
03
Front
How are native VLAN frames normally sent on an 802.1Q trunk?
Back
Frames in the native VLAN are normally sent untagged on an 802.1Q trunk.
04
Front
Why must both ends of a trunk use the same native VLAN?
Back
Configure the same native VLAN at both ends; otherwise, switches can assign untagged traffic to different VLANs.
05
Front
What does a trunk’s allowed VLAN list control?
Back
The allowed VLAN list limits which VLANs can cross the trunk.
06
Front
What does `switchport trunk allowed vlan 10,20,99` do?
Back
`switchport trunk allowed vlan 10,20,99` sets the list to those VLANs; it does not add them to the existing list.
07
Front
Which command adds VLAN 30 to an existing trunk allowed list?
Back
Use `switchport trunk allowed vlan add 30` to add VLAN 30 without replacing the existing list.
08
Front
Does making a VLAN native automatically allow it across a trunk?
Back
A VLAN must be in the allowed list to carry data across the trunk; native status alone does not include it.
09
Front
What is the default native VLAN on many Cisco switches?
Back
On many Cisco switches, the default native VLAN is VLAN 1.
10
Front
What spanning-tree issue may be reported if trunk native VLANs differ?
Back
A native VLAN mismatch can cause spanning-tree inconsistencies to be reported.
11
Front
Which command checks operational trunk state and VLAN membership?
Back
`show interfaces trunk` checks the operational trunk state and VLAN membership.
12
Front
What can `show vlan brief` help verify?
Back
`show vlan brief` displays VLAN information; use it to check that required VLANs exist and are active.
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