WHAT IS VLAN?

A VLAN (Virtual Local Area Network) is a logical collection of devices such as workstations, servers and network devices that are grouped together in the manner such that they appear to be on the same LAN despite their geographical distribution. VLANs can be locally significant or be trunked over multiple layer 2 devices. VLANs are implemented to achieve scalability, security and ease of network management and can quickly adapt to changes in network requirements and relocation of workstations and server nodes.

Note- This is very important topic in CCNA. Which are very important network training in current IT industry.

BENEFITS OF VLAN:

VLANs provide the following benefits:

Security – Separating systems that have sensitive data from the rest of the network decreases the chances that people will gain access to information they are not authorized to see.

Performance/Bandwidth – Careful monitoring of network use allows the network administrator to create VLANs that reduce the number of router hops and increase the apparent bandwidth for network users.

Broadcasts/Traffic flow – Since a principle element of a VLAN is the fact that it does not pass broadcast traffic to nodes that are not part of the VLAN, it automatically reduces broadcasts.

Easier fault management – Troubleshooting problems on the network can be simpler and faster when your different user groups are segmented and isolated from one another. If you know that complaints are only coming from a certain subset of users, you’ll be able to quickly narrow down where to look to find the issue.

Departments/Specific job types – Companies may want VLANs set up for departments that are heavy network users (such as multimedia or engineering), or a VLAN across departments that is dedicated to specific types of employees (such as managers or sales people).

STEPS TO CONFIGURE VLAN ON CISCO DEVICES:

Step 1:

Place and connect the devices as shown below:

Step 2:

Configure VLANs on both the switches using below commands in CLI

Step 3:

Associate switch ports with already configured VLANs on both the switches as shown below:

Step 4:

Configure mode trunk to all interfaces of switches that connect to another switch using below commands:

Step 5:

Now give IP address and subnet mask for each laptop connected to the switch as illustrated below:

All 4 laptops are assigned the ip address and subnet masks in the following fashion:

Laptop 1:     10.1.2.2       255.255.0.0

Laptop 2:     10.1.2.3       255.255.0.0

Laptop 3:     10.1.3.2       255.255.0.0

Laptop 4:     10.1.3.3       255.255.0.0

After the above five step configuration is done, verify whether the configuration is correct by performing ping between the laptops having same vlan configuration. This ping should be successful as shown below:

Similarly, ping between devices on different VLANs will be unsuccessful as shown below:

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