What is VLAN in compurter networking

Friends, in this post today, we will know what is VLAN? Learn in detail about how VLAN works and the advantages and disadvantages of using the Advantages of VLAN (Virtual LAN) and VLAN in the network.

What is a virtual LAN?

A Local area network (LAN) consists of network devices that are connected to each other within a geographical range. A LAN network consists of devices such as computers, hubs, bridges, switches, and routers. A virtual area network (VLAN) is a collection of networking devices in the same broadcast domain. Networking devices in a broadcast domain can share information with each other without the use of routing devices.


What is ARP Protocol and how does it work?
What is the HDLC protocol and how does it work?

VLANs are a logical group of network devices. When we create a VLAN, we break a Large Broadcast Domain into Smaller Broadcast Domains. You can consider VLAN as a Subnet, just as two different Subnet routers cannot communicate with each other, just as two different VLANs can also communicate with each other. Is required.

For example, an organization has two offices, one in Delhi and the other in Gurgaon, and both these offices have their own separate LANs (Local Area Network). The Delhi office employs 50 employees. And similarly, 30 employees work in the office of Gurgaon. The Employees of Delhi office is from the Accounts Department and the Employees of Gurgaon marketing the company.

Now if a marketing employee is needed in the building of the Accounts Department so that he can work together with the Accounts Department. In such a situation, the network administrator configures the VLAN in the network. And he will physically remove one host (computer/device) from Gurgaon office LAN and connect it to Delhi office LAN. Now that employee of the Accounts Department can work closely with the Marketing Department.

Let us take another example to understand VLAN more clearly.


  1. Our company has three offices.
  2. All offices are connected to Back Links.
  3. The company has three departments: Development, Production, and Administration.
  4. The Development Department has 10 computers.
  5. The Production Department has 15 computers.
  6. The Administration Department also has 25 computers.
  7. Each office has two computers each from the Development, Production, and Administration Department.
  8. The Administration and Production Department has sensitive information that it does not want to share with the Development Department.

With the default configuration, all computers share the same broadcast domain. One can, therefore, access Development Department Administration or Production Department Resources.

With VLAN we can create logical boundaries on a physical network. Suppose we have created three VLANs for our network and Assigned the computers related to them like.

  • VLAN Admin for Administration department
  • VLAN Dev for Development department
  • VLAN Pro for the Production department
Physically we did not change anything, but logically we grouped the devices according to their function. These Groups [VLAN] require a router to communicate with each other.

With the help of VLAN, we have separated our single network into three smaller networks. These networks do not broadcast with each other's networks. VLAN also enhances security in the network. Now the Development Department cannot directly access the Administration and Production Department.

  1. What is the Point to Point protocol?
  2. What is Telnet Protocol?
  3. What is a STATIC VLAN?
It is a port-based VLAN. Switch ports must be manually assigned to the VLAN. Any device connecting to switch ports becomes a member of that VLAN. As soon as the device enters the network in the static VLAN, the device automatically assumes the VLAN of that port.
f the user changes the port and needs to access the same VLAN, the network administrator manually creates a port for the VLAN.

What is a DYNAMIC VLAN?

All devices are automatically assigned to a VLAN based on MAC address. This allows the client to remain in the same VLAN regardless of which device is ported. A user's VLAN membership is always the same, even if the user has moved to another location in the network.

Advantage of VLAN

There are many advantages of implementing Virtual Local Area Network (VLAN) in the network, some of them are as follows.

  • Solve the broadcast problem
  • Reduce the size of broadcast domains
  • Allow us to add an additional layer of security
  • Make device management easier
  • Allow us to implement the logical grouping of devices by function instead of the location
  • Allowing network administrators to apply additional security to network communication
  • Making expansion and relocation of a network or a network device easier
  • Decreasing the latency and traffic load on the network and the network devices, offering increased performance

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