Answer / vikram

subnetting is breaking of a network ... vlan is breaking a
broadcast domain. moreover subnetting is a layer 3 concept
and vlan is a layer 2 concept.

Answer / abhishek

Concept of subnet = Network.
So Subnet is the breaking up of a network into many sub networks. . under a single IP Address domain .
Since IPv4 has a shortage of Public addresses so we do teh subnetting of a single Public IP address assigned to us by the ISP.
And this concept uses the fundas of prefix length denoted by /<number><0-32><cr>
.........
VLAN - its virtal lan. . breaking up of a single lan Segment(Switch) int varius LANS..on a single Switch/es.
.........
The difference -
Subnetting and VLAN (subneting is a Layer 3 functional concept)
whereas
Vlan is done on a layer 2 device with the help of subneting. .
for Vlan we neeed to subentting. .
For subnetting Vlan is not must. .

Answer / ranji2011

Hi Friends,

“Subnetting” allows you to create multiple logical networks
that exist within a single Class A, B, or C network. If you
do not subnet, you are only able to use one network from
your Class A, B, or C network, which is unrealistic.
Each data link on a network must have a unique network ID,
with every node on that link being a member of the same
network. If you break a major network (Class A, B, or C)
into smaller subnetworks, it allows you to create a network
of interconnecting subnetworks. Each data link on this
network would then have a unique network/subnetwork ID. Any
device, or gateway, connecting n networks/subnetworks has n
distinct IP addresses, one for each network / subnetwork
that it interconnects.

In order to subnet a network, extend the natural mask using
some of the bits from the host ID portion of the address to
create a subnetwork ID.

“VLANs” are a mechanism to allow network administrators to
create logical broadcast domains that can span across a
single switch or multiple switches, regardless of physical
proximity. This function is useful to reduce the size of
broadcast domains or to allow groups or users to be
logically grouped without the need to be physically located
in the same place.

Regards,
Ranji
Network engineer
netranjit@yahoo.co.in

Answer / dileep reddy

jitendra u r correct,but up to my knowledge
you mentioned there ,"devide the single IP". it is not
correct ..devinding the sigle network ip into diferent
network ips is called subnetting

Answer / sunny kumar

i have read all the answers but in my point
of view
the equal division of a network address in to multiple
network addresses with the same subnetmask is called subnetting

and the equal division of broadcast domain in to multiple
broadcast domains is called vlan......

Answer / megadeth

guys the point is not complicating things.
the question being what is the difference between
subnetting and vlan

subnetting is done for optimum utilisation of ip addresses.
alright, further there is VLSM ,supernetting with their own
advantages.

in subnetting you just break up one big network into
various sub networks.

vlan is wherein one can establish communication between
thse networks.

Answer / jitendra

NIKHI My friend here is the answer for urs question

i have seen that many of the guy replyed that subnating is
the breaking of the network.but i am not agree it might be
possibe that i will be wrong but some how i am putting mine
answer here

subnating---comes for sub+network+networking==subnating

subnating is the process by which we devide the single ip
in to the mulitple ip so that we can draw our network
according to our requirment.
just try to remember what mr.chobe gives the exapmpe in our
class
he take a ip pool
192.168.100.0/24
and he teacheh us the vlsm desiging.just refre that page on
urs notebook.
here what u r seeing thet we got the single ip pool and we
dived this ip pool in diffrent ip poo.this process that is
breaking the one ip in multilple ip is caled subnating

also plz refre mine privous post.

now what is vlan

vlan is called virtual vlan
Vikram replied that vlan is used for breking the single
broadcast domain.but this is not the complete answer for
interview asspect.

as in any com ther are mainly three sec
HR
MKTG
FINCE
TECHNICAL
and more
if we want that technical departmet server can not be
accesble from the Hr so we are creating vlan
this is the exapmle of breaking the broad cast domain in
multlple broad cast domain


thanks
jitendera

i have told mine answer abut osi layer on phone last day i
am still waitng for the new repl

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