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To communicate between different VLAN with a router or L3 Switch Router On A Stick (ROAS) R1(config)#interface fastEthernet 0/0 R1(config-if)#no shutdown R1(config-if)#exit R1(config)#interface fastEthernet 0/0.10 R1(config-subif)#encapsulation dot1Q 10 R1(config-subif)#ip address 192.168.10.254 255.255.255.0 R1(config-subif)#exit R1(config)#interface fastEthernet 0/0.20 R1(config-subif)#encapsulation dot1Q 20                 R1(config-subif)#ip address 192.168.20.254 255.255.255.0 Above you can see my two sub-interfaces and the IP addresses that I assigned to them. IP address 192.168.10.254 will be the default gateway for computers in VLAN 10 and 192.168.20.254 for computers in VLAN 20. SVI (Switch Virtual Interface) SW(config-if)#interface vlan 10 SW(config-if)#ip address 192.168.10.1 255.255.255.0 SW(config-if)#no shu SW(config-if)#interface vlan 20 ...

VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks (VLAN) on the whole local area network. To do this, VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over 802.1Q, and ISL trunks. Three VLAN division with three broadcast domain VTP pruning is a feature in cisco switches, which stops VLAN updates information traffic from being sent down trunk links if the updates are not needed. VLAN 1 can never be prune because it’s an administrative VL AN. VTP Pruning VTP-SERVER Switch1(config)#vtp domain VtpDomain Switch1(config)#vtp password VtpPassword Switch1(config)#vtp pruning VTP-CLIENT Switch2(config)#vtp mode client Switch2(config)# vtp domain VtpDomain Switch2(config)# vtp password VtpPassword VTP-TRANSPARENT Switch3(config)#vtp mode transparent Switch3(config)# vtp domain VtpDomain Switch3(config)# vtp password VtpPasswo...

Vlan : Virtual Local Area Network subdivide a network into virtual LANs. Creating seperate broadcast domain. Access Port: An access port transports traffic to and from only the specified VLAN allotted to it Trunk Port: A trunk port is a port that is assigned to carry traffic for all the VLANs that are accessible by a specific switch, a process known as trunking. Trunk ports mark frames with unique identifying tags – either 802.1Q tags or Interswitch Link (ISL) tags – as they move between switches. Therefore, every single frame can be directed to its designated VLAN. Vlan Creation: switch# configure terminal switch(config)# vlan 15 switch(config)# name Test Access Port switch# configure terminal switch(config)# interface ethernet 1/13 switch(config-if)# switchport mode access switch(config-if)# switchport access vlan 15 Trunk Port switch(config)# interface ethernet 1/14 switch(config-if)# switchport mode trunk switch(config-if)#switchport trunk encapsulat...

Learning subnetting is much easier that it looks. All you need is basic understanding of  IP Addressing and Maths Formulas Of Subnetting 1. Number of Valid Host (2n-2) Where n is number of Host bits (0's) 2. Number of Valid Network (2y) Where y is number of borrowed Network bits   (1's) NOTE : With ip-subnet command we can use 1st & last ip NOTE : Block size remain same for all classes Learn the following table or save it for solving subnetting much faster.   Wild Card is always 1 less then block size. Example : \30 Wildcard will be (Block size -1) (4-1) =3 \30= 0.0.0.3

Hi Guys, Before posting anything in this tab, i want to clear that this is not a networking tutorial instead a reference guide. Thanks & Regards Amit Chowrasia