mac or ip communication ?

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i know that hosts communicate via hardware addresses
on the local LAN

but why do we use ip addresses for pcs in local area network?

for ex. there are too many pcs connected to one same
switch , while they are contacting we give ip addresses
to hosts then why?

 

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To understand why, you need to understand the OSI model. Google for it. It's not easy to understand at first glance, but over time, it will become easier to understand.

MAC addresses are physical addresses. IP addresses are logical addresses. MAC addresses give no clue as to the location of the device; IP addresses do.

 

each pc or nodes has its own ip address to ensure there are no conflicts between nodes, plus it helps identify the pc, the concept is similar to web addresses...

also note what BBM mentioned re MAC addresses aswell.

in your example, what do you mean by "too many pcs connected to one same switch " ?

 

You need IP addresses for the TCP/IP stacks in the computers to work.

There is no software on a standard PC that communicates on just Ethernet alone.

As others have said - read up on the OSI stack.

Harry.

 

...and if you don't learn it the first time, it'll haunt you forever, because it NEVER goes away... especially for certification exams.

 

hmm people , i know how OSI works

lets say encapsulation thing for the name of it

but think then switch doesn't understand the ip address
since its osi layer 2 device (1 and 2 )

so while we put pcs and a switch connected to each
switch uses address filtering but in the beginning it doesn't know
the destination mac so it broadcasts all other hosts and
from the port except the port it received the frame.
then when i response from a host is received
by switch , frame goes to right destination (by registering
in filter table)

and switch doesn't understand ip (cause
it is layer 2)

here above there no looks like ip addresses
so what do you say about ip on pcs?

 

Kobem - reading your posts hurts my brain...

Do you not have someone who can articulate what you're trying to say a bit better? I know thats a bit of a cheek, since whatever language you speak I probably couldn't communicate with you nearly as well as you can in English!

Basically, the OSI model is your friend. You'll need to know it inside and out for pretty much any networking exam you take - although its relevance is often not exactly apparent to many day to day tasks you'll encounter in the real world, for understanding something like this it really is useful.

Layer 2 communication works on MAC addresses, whilst Layer 3 communication works with IP addresses (or other such protocols). This is one of the basic differences between traditional switching and routing.

Hopefully This article will help explain things for you more clearly than I could ever hope to do.

 

you meant this

while pcs communicating , they use mac
but for "location detection" they use ip addresses

ok but switch doesn't understand ip address?

 

I had to read the above several times to get to the point that I thought I understood what you were trying to say.

This is pretty much how a switch works. So what is the question?

Harry.

 

If you truly understood the OSI model, you'd not have a question about why we use IP addresses vs. MAC addresses.

Shoulda known better than to try to answer a kobem question...

 

nearly i found the answer

when a host tries to communicate with another
ARP is used that specifies ip address converting to mac
in local LAN

so we need ip addresses on hosts.

 

That's back to front in my view. ARP exists to allow IP networks to find local hosts on an Ethernet network.

If it wasn't an Ethernet network you wouldn't find ARP either.

Harry.

 

what do you mean sparky?

 

Lawn chair... check.

Coke Classic... check.

Popcorn... check.

Okay... I'm ready for the entertainment.

 

Feet up

Beer in hand

Light a ciggy..

Waiting Sparky....

 

Kobem,

I see your original question has been answered.

TCP and the OSI model is big topic that has had entire books devoted to the subject. May I suggest you take a look at this excellent website?;

TCP/IP Guide