VLAN & Trunks

Question 1

What is a VLAN?

Answer 1

A layer 2 (data link) feature that allows virtual network segmentation (dividing a physical network into separate logical networks). Each VLAn is a logical network and represents a separate broadcast domain

Question 2

How do you transfer data between VLANs?

Answer 2

Requires a layer 3 device (e.g. router)

Question 3

How do VLANs work?

Answer 3

Multiple ports are configured on the switch and associated w/ a VLAN, creating a logical barrier btwn end devices connected on the switch.

Question 4

What are the benefits of using VLANs?

Answer 4

1. Improved security
2. Enhanced performance
3. Simplified mgmt

Question 5

What is a VLAN ID?

Answer 5

Identifies a VLAN in the network because there is a complete separation btwn VLANS. On Cisco devices, valid ID range is 1 to 1005. Also, extended range at 1006-4094 (used in large networks such as an ISP network)

Question 6

What are VLAN types?

Answer 6

1. Default VLAN
2. Data VLAN
3. Voice VLAN
4. Management VLAN
5. Native VLAN

Question 7

What is Default VLAN?

Answer 7

VLANs 1 and 1002-1005 are reserved and added automatically during device installation. These VLANs cannot be removed or reanmed.

Question 8

What is a Data VLAN?

Answer 8

VLANs 2-1001 are commonly used for data exchange. They tag data traffic w/ an identifier

Question 9

What is Voice VLAN?

Answer 9

Designed for VoIP network traffic

Question 10

What is Management VLAN?

Answer 10

Interface VLAN 1 is a management VLAN used for SVI. Enable remote connection and conduct basic network functions

Question 11

What is Native VLAN?

Answer 11

Designed to forward untagged traffic (e.g. DTP and CDP) among switches. By default, VLAN 1 is a native and mgmt VLAN

Question 12

IOS Command:

show vlan brief