COMPUTER NETWORK AND SECURITY

 

CREATION OF  VLAN AND TRUNKING 

A VLAN (virtual LAN) is a subnetwork which can group together collections of devices on separate physical local area networks (LANs).VLAN is a custom network which is created from one or more local area networks. It enables a group of devices available in multiple networks to be combined into one logical network. The result becomes a virtual LAN that is administered like a physical LAN. 

USE OF VLAN :

A VLAN allows you to segment a network without needing separate hardware. So, you can have a single physical switch, but multiple different networks connected. You can group computers, servers, or other resources into a network based on department or user type. It doesn't have to be based entirely on physical location.

 

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Switch 1 

CLI 

Switch> 

Switch>en 

Switch#show vlan brief 

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Configuring VLAN 

Switch#config t 

Switch(config)#vlan 10 

Switch(config-vlan)#name Students 

Switch(config-vlan)#vlan 20 

Switch(config-vlan)#name Faculty 

Switch(config-vlan)#vlan 30 

Switch(config-vlan)#name IT 

Switch(config-vlan)#exit 

Switch#show vlan brief 

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We see the name of VLAN but ports are not assigned. 

 

Switch 2 

CLI 

Switch> 

Switch>en 

Switch#show vlan brief 

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Switch#config t 

Switch(config)#vlan 10 

Switch(config-vlan)#name Students 

Switch(config-vlan)#vlan 20 

Switch(config-vlan)#name Faculty 

Switch(config-vlan)#exit 

Switch(config)#exit 

Switch# 

Switch#show vlan briefCapture.JPG 

To assign port to VLAN and make it access port 

 

 

Switch 1 

Switch#config t 

Switch(config)#int fa0/1 

Switch(config-if)#switchport mode access 

Switch(config-if)#switchport access vlan 10 

Switch(config-if)#exit 

Switch(config)#int fa0/2 

Switch(config-if)#switchport mode access 

Switch(config-if)#switchport access vlan 20 

Switch(config-if)#exit 

Switch(config)#int fa0/3 

Switch(config-if)#switchport mode access 

Switch(config-if)#switchport access vlan 30 

Switch(config-if)#exit 

Switch(config)#exit 

Switch# 

  

Switch#show vlan brief 

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Switch 2 

Switch#config t 

Switch(config)#int fa0/1 

Switch(config-if)#switchport mode access 

Switch(config-if)#switchport access vlan 10 

Switch(config-if)#int fa0/2 

Switch(config-if)#switchport mode access 

Switch(config-if)#switchport access vlan 20 

Switch(config-if)#exit 

Switch(config)#exit 

Switch# 

  

Switch#show vlan brief 

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Assign Ip to desktop 

Vlan 10 

Pc0 

Ip address: 10.0.0.1 

Subnet mask: 255.0.0.0 

Pc3 

Ip address: 10.0.0.2 

Subnet mask: 255.0.0.0 

 

 

Vlan 20 

Pc1 

Ip:192.168.10.1 

255.255.255.0 

Pc4 

Ip:192.168.10.2 

255.255.255.0 

 

 

Vlan 30 

Pc2 

Ip:192.168.100.1 

255.255.255.0 

Pc0 and pc3 are on same vlan and if we try to ping them but they will not connect. Switch to switch connection has not been done.so we will make them trunk. 

switch 1 

Switch> 

Switch>en 

Switch#config t 

Switch(config)#int fa0/4 

Switch(config-if)#switchport mode trunk 

  

Switch(config-if)# 

SWITCH 2 

Switch> 

Switch>en 

Switch#config t 

Switch(config)#int fa 0/4 

Switch(config-if)#switchport mode trunk 

Switch(config-if)# 

Switch(config-if)#exit 

Switch(config)#exit 

Switch# 

  

Switch# 

Switch# 

Switch#show interface trunkCapture.JPG 

After trunking we get the reply from two pc in one vlan. 

 VIDEO LINK: VLAN AND TRUNKING