Does the Acronym LAN Only Refer to Scale?

chrstrbrts

Senior member
Aug 12, 2014
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Hello,

I'm familiar with the acronyms LAN, MAN, and WAN. My understanding is that these terms refer to the size of the network: small (the size of a room, building, or university campus), medium (the size of a city), and large (country size).

However, I've been reading about networks lately and have come across text that suggests that LANs are mostly (or all) broadcast networks. I thought that whether or not a network was broadcast had to do with its topology and didn't have anything to do necessarily with its size.

For example, a network that sends signals down some central trunk that all nodes tap into, like the old cable TV system, would be a broadcast network. Or anything wireless would be broadcast (obviously).

So, now I'm a little confused.

My understanding is that all wireless networks are broadcast by default. Further, whether or not a wired network is broadcast stems from how the network is physically laid out. That is, for wired networks, being of broadcast type stems from the network's topology, and its size is not a factor necessarily.

By extension, my belief is that you can mix and match sizes and topology at will within physical constraints.

Am I right?

Or, is there something else going on that I'm missing that would explain why LANs are almost always broadcast?

Thanks.
 

JackMDS

Elite Member
Super Moderator
Oct 25, 1999
29,528
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The truth is that One has to understand well the technology that involved Networking used by a Network. It is hard and demands alot of time and learning to understand how variety of Networks work.

As a result many of the "pop" Interment write up deal wit the topic thorough "Verbal Manipulation" rather then real understanding of the issues.

http://compnetworking.about.com/od/basicnetworkingconcepts/a/network_types.htm

Basic networking concepts does not mean Technology concepts.



:cool:
 

Berliner

Senior member
Nov 10, 2013
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www.kamerahelden.de
Regarding broadcasting you must be reading some very old books.

Also, LAN refers mainly to size, if you compare it to WAN and MAN. Terms you won't hear much outside of books.
 

azazel1024

Senior member
Jan 6, 2014
901
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Generally just scale. It can also mean anything within a non-routed network. So if you are routing between networks, then you start getting in to more CAN/BAN type stuff (Campus/Building Area Network). It is mostly just what you want to call it.

LAN, WLAN, WAN, MAN, CAN (multiple kinds of CANs, Campus or Car Area Network), PAN and so on. Heck, NASA even has an IAN (Interplanetary Area Network).
 
Feb 25, 2011
16,983
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Poorly defined terms. Also, moving targets: my house "PAN" has more devices and IPs than most LANs did not-too-long ago.

And if I enabled guest Wifi and started routing between subnets, well, woof.