Implementing VLANs Flashcards
Chapter 11 (15 cards)
What is VLAN tagging?
When the sending switch adds another header to the frame before sending it over the trunk. This extra trunking header includes a VLAN identifier (VLAN ID) field so that the sending switch can associate the frame with a particular VLAN ID,
What are the two trunking protocols supported by Cisco switches?
ISL and 802.1q
How does 802.1q tag a frame?
It inserts an extra 4-byte 802.1Q VLAN header into the original frame’s Ethernet header
What fields does an 802.1q tag consist of?
Type, Priority, Flag, and 12-bit VLAN ID. It supports maximum 4094 VLANS
Are packets in the native VLAN tagged?
No
What command configures a switchport to always act as a trunk?
switchport mode trunk
What command configures a switchport to initiate trunking negotiation?
switchport mode dynamic desireable
What command configures a switchport to passively wait for trunk negotiation at which point it will negotiate the trunk?
switchport mode dynamic auto
Switch A is switchport mode trunk and Switch B is switchport mode dynamic auto
Trunk
Switch A is switchport mode dynamic auto and Switch B is switchport mode dynamic auto
No Trunk
Switch A is switchport mode dynamic desireable and Switch B is switchport mode dynamic auto
Trunk
Switch A is switchport mode trunk and Switch B is switchport mode dynamic desireable
Trunk
If a switch has VTP disabled what mode is it in?
Transparent
If a switch has VTP disabled and a user goes into configuration mode, enters ‘vlan 22’ and ‘name Hannah’ will the VLAN configuration show up in the running-config?
Yes
Which show commands identify trunking interfaces?
show interfaces trunk
show interfaces switchport
