vlans

[cephas Mutamiri]

hie 

im new in this line of study. I am studying ccna but im finding im having difficulty with understanding vlans.

how they work..

how they are configured 

please any one to assist me with the topic

[Martin L]

Lots of resources here and overall on the net; check this https://community.cisco.com/t5/networking-documents/vlans/ta-p/3114286

then go to youtube and search videos 

also see CLN ccna resources https://learningnetwork.cisco.com/s/ccna

Regards, ML
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[luis_cordova · Accepted solution]

Hi @cephas Mutamiri  

In simple words, vlanes allow you to divide a physically connected network into several logical networks.

For example, a company occupies one floor of a building.
All hosts (PC, IP Phones, IP Printers, etc.) are connected to a switch and this switch to a router.

In this physically connected network there is a single broadcast domain, so everyone can reach any other host in the domain, without restrictions.

But, broadcast domains must be separated by departments to avoid security risks.

Without the vlan, this could only be accomplished by having a separate switch for each broadcast domain, which would then connect to the router.
But, thanks to the vlan, these broadcast domains can be logically separated, being able to occupy the same switch, but assigning the ports to a different vlan, depending on the department to which that host belongs.

Regards

This is in simple words, but if you want to go deeper, you can search for more information, such as this link:

https://www.cisco.com/c/en/us/support/docs/lan-switching/vlan/10023-3.html