VLANs
As networks have grown in size and complexness , many companies have turn tovirtual local country networks(VLANs ) to provide some way of structure this growing logically . fundamentally , a VLAN is a collection of knob that are aggroup together in a singlebroadcast domainthat is base on something other than strong-arm location .
You learned about broadcasts to begin with , and how a router does not drop dead along program . A broadcast domain is a connection ( or portion of a connection ) that will receive a programme mailboat from any node located within that connection . In a typical mesh , everything on the same side of therouteris all part of the same program domain . A shift that you have implemented VLANs on has multiple broadcast domains , similar to a router . But you still need a router ( orLayer 3 routing engine ) to route from one VLAN to another – the switch ca n’t do this by itself .
Here are some common reason why a company might have VLANs :
you’re able to create a VLAN using most switching simply by logging into the switch viaTelnetand embark the parameters for the VLAN ( name , domain and port wine designation ) . After you have created the VLAN , any web segments connected to the arrogate port will become part of that VLAN .
While you’re able to have more than one VLAN on a switch , they can not communicate at once with one another on that switch . If they could , it would defeat the intent of having a VLAN , which is to isolate a part of the internet . communicating between VLANs requires the use of arouter .
VLANs can span multiple switch , and you may have more than one VLAN on each switch . For multiple VLANs on multiple switches to be able-bodied to communicate via a single tie-in between the transposition , you must use a process calledtrunking– trunking is the engineering that allows information from multiple VLANs to be carry over a single connexion between switches .
On the next Thomas Nelson Page , you ’ll larn about trunking .
