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Posted by vlsidesign on October 9, 2007, 6:57 pm
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A bridge connects two different network segments (different IP address
network portion) together?
Whereas a Access point connects a wired network segment to wireless
nodes (has a WAN side and a wireless LAN side). Where the LAN side is
considered one network segment (one network segment between various
nodes that are on that one network segment)???? I believe the nodes
would have same IP address network segment, but different sub-nets.
I was confused, and was trying to get a good idea and definition in my
head. Anyway, I appreciate your time and any help, thanks :)
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Posted by Albert Manfredi on October 9, 2007, 8:14 pm
> A bridge connects two different network segments (different IP address
> network portion) together?
>
> Whereas a Access point connects a wired network segment to wireless
> nodes (has a WAN side and a wireless LAN side). Where the LAN side is
> considered one network segment (one network segment between various
> nodes that are on that one network segment)???? I believe the nodes
> would have same IP address network segment, but different sub-nets.
>
> I was confused, and was trying to get a good idea and definition in my
> head. Anyway, I appreciate your time and any help, thanks :)
If you read IEEE 802.11-1999, the basic document describing how
wireless LANs are structured, you will see that in effect, the access
point can be a bridge. Which means, you don't have to assign different
IP subnets, and use a router, to tie together the multiple wireless
and wired components of a layer 2 network.
In 802.11, they talk about a Distrbution System (DS) that may be used
to tie together multiple isolated (or even overlapping) Basic Service
Sets (BSS). The BSS is what you might call a single WiFi LAN. And IEEE
802.11 does not limit what this DS can consist of. For example, it
could be a wired Ethernet (Section 5.2.4). The combination of multiple
BSSs tied together with the DS is referred to as an Extended Service
Set (ESS). The message here is that there has been no mention of IP
routing, or any use of a Layer 3 protocol, if you introduce multiple
access points into the ESS.
IEEE 802.11 also specifies a functional box called "portal." Quoting,
"To integrate the IEEE 802.11 architecture with a traditional wired
LAN, a final logical architectural component is introduced-a
portal. ... Portals connect between the DSM and the LAN medium that is
to be integrated."
Again, no mention of any routers being required to integrate these
LANs.
So, bottom line, the combination of an "access point" and a "portal,"
and the use of a wired Ethernet as the DS, would show that the intent
of IEEE 802.11 is to allow these WiFi LANS to be bridged together, and
to be bridged with other non-wireless LANs as well.
However, while 802.11 adopted the same 48-bit address standard as
other 802 LANs, 802.11 does preclude the possibility that the DS does
not use the 48-bit MAC address standard. So if that's the case, then
even though you can bridge between separate WiFi LANS across this DS,
you would not be able to bridge to hosts connected directly to the DS.
Detail: the 802.11 max length of the Frame Body is 2312 bytes, but 8
of those are used for protection (WEP). So the actual data max is 2304
per frame. As opposed to 1500 bytes for Ethernet. Some people go
ballistic when they think of bridging schemes together that have
different max payload capacities.
Bert
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Posted by Nafeesa on October 11, 2007, 1:42 pm
hello Bert, i badly need help.
i have got an assignment on IEEE standards. i have to list down all
the IEEE standards of the wired network and the wireless network. With
more than 25 references and make a powerpoint presentation on that.
can u plz give me an idea or suggestions how am gonna proceed? thx
loads.
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Posted by Albert Manfredi on October 11, 2007, 2:11 pm
> hello Bert, i badly need help.
>
> i have got an assignment on IEEE standards. i have to list down all
> the IEEE standards of the wired network and the wireless network. With
> more than 25 references and make a powerpoint presentation on that.
> can u plz give me an idea or suggestions how am gonna proceed? thx
> loads.
Doing a search with search engine would get you a lot of info to sift
through.
My suggestion is to begin by going directly to the IEEE site:
http://standards.ieee.org/getieee802/portfolio.html
and look at what each one of those addresses. The IEEE has decided to
make these available free of charge, after they have been published
for 6 months. This list is not complete, but they are the standards
that are most relevant today (with the possible exception of 802.5).
You can read the initial sections to get an idea of what each standard
discusses.
That gives you a good basis, and then you can add others that you find
in the more general search.
Bert
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Posted by Justa Lurker on October 11, 2007, 7:41 pm
Nafeesa wrote:
> hello Bert, i badly need help.
>
> i have got an assignment on IEEE standards. i have to list down all
> the IEEE standards of the wired network and the wireless network. With
> more than 25 references and make a powerpoint presentation on that.
> can u plz give me an idea or suggestions how am gonna proceed? thx
> loads.
>
You know, I cringe whenever I see these sorts of requests.
This sounds to me like you are a student at the post-secondary (college)
level in some kind of technical program of study.
Why aren't you equipped with the basic skills to research an assignment
instead of expecting someone to hand you all the raw materials ? This
seems more prominent, but certainly not exclusive, to those with foreign
names --- and I wonder if it is not a cultural thing as well as a
general lowering of the bar in our "educational" institutions.
And why are you asking here ? Don't you have a professor, instructor,
T.A., whatever for this class ? Didn't you ask them ? What did they
tell you ? They should certainly have a good idea of what resources are
available at your campus, and how to go about making the best use of them.
Admittedly, "u plz" and "thx" gives me a pretty accurate sense of your
existing English language skills....regardless of wherever you hail from.
Good luck with the assignment.
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