VLAN Configuration and Creation Quiz and Flashcards

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Questions and Answers

What is a primary benefit of dividing a LAN into multiple VLANs?

Improved IT efficiency (correct)

Reduced network security

Increased cost of network infrastructure

Increased broadcast domains

What is the primary purpose of the Native VLAN?

Used for trunk links only (correct)

Carrying SSH/Telnet VTY traffic

Carrying end-user traffic

Used for management and data traffic

What is the default VLAN in a Cisco switch?

VLAN 2

VLAN 10

VLAN 1 (correct)

VLAN 100

What is the result of reducing the number of broadcast domains in a LAN?

Improved network performance Signup and view all the answers

What is the benefit of using VLANs in terms of network security?

Only devices in the same VLAN can communicate with each other Signup and view all the answers

What is the purpose of a Management VLAN?

Carrying SSH/Telnet VTY traffic Signup and view all the answers

Which VLAN range is typically used by Service Providers?

1006 - 4095 Signup and view all the answers

What is the purpose of the vlan.dat file in flash?

Stores VLAN details Signup and view all the answers

What is the default name given by Cisco IOS if a VLAN is not named?

vlan- Signup and view all the answers

What configuration mode is required to create a VLAN?

Global configuration mode Signup and view all the answers

Which VLANs are auto-created and cannot be deleted?

1002-1005 Signup and view all the answers

What is required to synchronize VLANs between switches?

VTP configurations Signup and view all the answers

What is the consequence of deleting a VLAN without reassigning its member ports?

The VLAN is deleted, but the member ports still transmit traffic Signup and view all the answers

What is the purpose of the switchport mode trunk command?

To configure the port for permanent trunking mode Signup and view all the answers

What is the effect of deleting the vlan.dat file on a switch?

The switch reverts to its default VLAN configuration Signup and view all the answers

What is the purpose of specifying the native VLAN on a trunk link?

To specify the VLAN that untagged traffic should be assigned to Signup and view all the answers

What is the command to verify the default VLAN configuration on a switch?

show vlan brief Signup and view all the answers

What is the consequence of not reloading the switch after deleting all VLANs?

The changes do not take effect until the switch is reloaded Signup and view all the answers

Study Notes

Benefits of VLANs

Smaller broadcast domains reduce network traffic and improve performance
Improved security as only users in the same VLAN can communicate with each other
Improved IT efficiency by grouping devices with similar requirements
Reduced cost as one switch can support multiple groups or VLANs
Simpler management as similar groups require similar applications and network resources

Types of VLANs

Default VLAN (VLAN 1) is the native and management VLAN and cannot be deleted or renamed
Data VLAN is dedicated to user-generated traffic (email and web traffic)
Native VLAN is used for trunk links only
Management VLAN is used for SSH/Telnet VTY traffic and should not be carried with end-user traffic
Normal Range VLANs are 1-1005, Extended Range VLANs are 1006-4095
VLANs 1002-1005 are reserved for legacy VLANs and are auto-created and cannot be deleted

VLAN Configuration

VLAN details are stored in the vlan.dat file
VLANs are created in global configuration mode using the 'vlan' command
A unique name must be specified to identify the VLAN
The IOS command to create a VLAN is Switch(config)# vlan vlan-id and Switch(config-vlan)# name vlan-name

Deleting VLANs

VLANs are deleted with the no vlan vlan-id command
Caution: reassign all member ports to a different VLAN before deleting a VLAN
All VLANs can be deleted with the delete flash:vlan.dat or delete vlan.dat commands
Reload the switch after deleting all VLANs

VLAN Trunks

Trunks are layer 2 and carry traffic for all VLANs
Trunk configuration commands include switchport mode trunk and setting the native VLAN and allowed VLANs on the trunk link

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Description

Test your knowledge on VLAN configuration, creation, and management in small to medium-sized businesses and service providers. Learn about the different VLAN ranges, reserved VLANs, and VTP configurations. This quiz covers the basics of VLAN configuration and its applications.