Lets talk about VLANs today, to understand VLAN you must know what a LAN is.
LAN is a local area network - it is a group of devices connected with a cable. Every packet goes to each device in a LAN. As the devices grow, collision can occur since a wire might already have a packet sent by another device. You can physically separate the device with routers but then you cant share resources also its physically connected and you will need to plug and unplug each time you want to connect certain devices each other. This is where VLAN comes in.
VLAN is a virtual LAN, a group of devices interact with each other like they are in the same domain. VLAN is a subset of the LAN. So a switch with 48 ports can be segmented such as ports 1- 24 are in one VLAN and ports 25-48 are in another VLAN.
Benefits of VLAN:
1. Scalability - Single switch to multiple segments - 2 floors you can have 1 switch with 2 vlans
2. Better performance than segmenting with routers
3. Partitioning for special projects - if only certain people need access to a confidential file they will be on one VLAN
4. Flexibility - its easy to move devices from one VLAN to another through configurations
Types of VLANs:
1. Static or port based VLAN - there is a VLAN ID tagged on the packet
2. Protocol based VLAN
3. Subnet based VLAN
LAN is a local area network - it is a group of devices connected with a cable. Every packet goes to each device in a LAN. As the devices grow, collision can occur since a wire might already have a packet sent by another device. You can physically separate the device with routers but then you cant share resources also its physically connected and you will need to plug and unplug each time you want to connect certain devices each other. This is where VLAN comes in.
VLAN is a virtual LAN, a group of devices interact with each other like they are in the same domain. VLAN is a subset of the LAN. So a switch with 48 ports can be segmented such as ports 1- 24 are in one VLAN and ports 25-48 are in another VLAN.
Benefits of VLAN:
1. Scalability - Single switch to multiple segments - 2 floors you can have 1 switch with 2 vlans
2. Better performance than segmenting with routers
3. Partitioning for special projects - if only certain people need access to a confidential file they will be on one VLAN
4. Flexibility - its easy to move devices from one VLAN to another through configurations
Types of VLANs:
1. Static or port based VLAN - there is a VLAN ID tagged on the packet
2. Protocol based VLAN
3. Subnet based VLAN
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