Volume 1 - Chapter 8: Implementing Ethernet Virtual LANs Flashcards
What is the size of the additional header added to a frame that passes over a trunk?
4 bytes
What are the 2 trunking protocols used to connect switches?
ISL (Inter-Switch Link) & 802.1Q
What VLAN IDs fall within the normal range?
1 to 1005
What VLAN IDs fall within the extended range?
1006 to 4094
Which 5 VLANs by default exist on a switch and cannot be deleted?
VLAN 1, 1002, 1003, 1004, 1005
What does the acronym VTP stand for?
VLAN Trunking Protocol
What 2 commands are used to effectively disable the use of VTP on a switch?
vtp mode transparent
vtp mode off (on newer switches)
Describe the difference between the following commands:
“switchport mode dynamic desirable”
“switchport mode dynamic auto”
When using desirable, the switch actively attempts to negotiate a trunk and responds to DTP messages
When using auto, the switch will respond to DTP messages, but not actively attempt to negotiate a trunk
What command can be used to display information about all active trunks on the switch?
show interface trunk
What command can be used to show additional information about the access/trunk and VLAN status of an interface?
show interface interfacename switchport
What command can be used to disable the use of DTP negotiations on a port?
switchport nonegotiate
What command can be used to apply a voice VLAN tag on a switchport access interface?
switchport voice vlan vlannumber
What commands can be used to shutdown a VLAN?
In global config mode:
shutdown vlan vlannumber
In VLAN config mode:
shutdown
What is the command to set the trunking encapsulation type for an interface?
(On older style switches)
switchport trunk encapsulation dot1q | isl | nonegotiate
Describe the difference between an interface’s operational versus administrative modes.
Administrative Mode: Whether or not trunking is used, and if used, what type (negotiated, static, etc.)
Operational Mode: Access versus trunked port.
A technician configures Gi1/0/48 on both SW1 & SW2 with the following settings:
* SW1: switchport mode trunk
* SW2: switchport mode dynamic desirable
What type of link will be formed by this configuration?
A trunk will be successfully formed.
A technician configures Gi1/0/48 on both SW1 & SW2 with the following settings:
* SW1: switchport mode trunk
* SW2: switchport mode dynamic auto
What type of link will be formed by this configuration?
A trunk will be successfully formed.
A technician configures Gi1/0/48 on both SW1 & SW2 with the following settings:
* SW1: switchport mode access
* SW2: switchport mode dynamic auto
What type of link will be formed by this configuration?
An access link will be successfully formed.
A technician configures Gi1/0/48 on both SW1 & SW2 with the following settings:
* SW1: switchport mode access
* SW2: switchport mode dynamic desirable
What type of link will be formed by this configuration?
An access link will be successfully formed.
A technician configures Gi1/0/48 on both SW1 & SW2 with the following settings:
* SW1: switchport mode dynamic auto
* SW2: switchport mode dynamic auto
What type of link will be formed by this configuration?
An access link will be successfully formed.
What command can be used to view detailed information about a port? Such as:
* Administrative/Operational modes
* Voice VLANs
* Access VLANs
show interface interfacename switchport
