24 Questions
What is the length of the IEEE 802.1Q header in bytes?
4 bytes
What is the function of the User Priority field in the 802.1Q VLAN Tag?
It is a 3-bit value that supports Canonical Format Identifier (CFI)
What is the purpose of the native VLAN in 802.1Q trunking?
It was designed for legacy use and is typically VLAN1 if not changed. Both ends of a trunk link must be configured with the same native VLAN.
How does a VoIP phone handle Voice VLAN tagging?
The switch uses CDP to inform the phone of the Voice VLAN, and the phone tags its own traffic and can set the Cost of Service (CoS).
What does DTP stand for?
Dynamic Trunking Protocol
What are the DTP configuration options?
Dynamic Auto, Dynamic Desirable, Trunk, Access, Dynamic Auto Access, Trunk, Trunk Access, Dynamic Desirable Trunk, Trunk Trunk, Access Trunk, Limited connectivity, Access
What is the default DTP configuration dependent on?
The Cisco IOS version and platform
What is the purpose of VLANs?
To segment networks based on function, team, or application
What is a trunk in the context of networking?
A point-to-point link that carries more than one VLAN
What is the purpose of a separate voice VLAN?
To support VoIP
What does IEEE 802.1q tagging provision for?
One native VLAN that will remain untagged
What protocol manages trunk negotiations?
Dynamic Trunking Protocol (DTP)
Which command can be used to verify VLAN information?
The show vlan command can be used to verify VLAN information.
What is the range of VLANs considered normal?
VLANs 1-1005 are in the normal range.
What command can be used to change VLAN port membership?
VLAN port membership can be changed using various commands, and verified using show vlan brief or show interface commands.
What is the maximum number of VLANs supported by Catalyst switches 2960 and 3650?
Catalyst switches 2960 and 3650 support over 4000 VLANs.
How can VLAN trunks be configured?
VLAN trunks can be configured using specific commands.
What does CoS stand for in the context of layer 2?
CoS stands for QoS for layer 2.
What are the options for the switchport mode command?
The switchport mode command has different options including access, dynamic auto, dynamic desirable, and trunk.
What is the range of extended VLANs?
VLANs 1006-4095 are in the extended range.
How can trunk configuration be verified?
Trunk configuration can be verified using the show interface switchport command.
What caution is advised before deleting a VLAN?
Caution is advised before deleting a VLAN.
Can phones tag frames from the PC?
Phones may or may not tag frames from the PC.
How can VLANs in a Multi-Switched Environment be verified?
VLANs in a Multi-Switched Environment can be verified using the show interfaces and switchport command.
Study Notes
Cisco VLAN Configuration and Trunking
- CoS stands for QoS for layer 2
- Phones may or may not tag frames from the PC
- VLANs in a Multi-Switched Environment can be verified using the show interfaces and switchport command
- Catalyst switches 2960 and 3650 support over 4000 VLANs
- VLANs 1-1005 are in the normal range, while VLANs 1006-4095 are in the extended range
- The show vlan command can be used to verify VLAN information
- VLAN port membership can be changed using various commands, and verified using show vlan brief or show interface commands
- VLANs can be deleted with the no vlan command, but caution is advised before deleting a VLAN
- VLAN trunks carry traffic for all VLANs and can be configured using specific commands
- Trunk configuration can vary based on the specific VLANs and subnets associated with each VLAN
- Trunk configuration can be verified using the show interface switchport command
- The switchport mode command has different options including access, dynamic auto, dynamic desirable, and trunk
Test your knowledge of Cisco VLAN configuration and trunking with this quiz. Learn about CoS, VLAN range, trunk configuration, and more.
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