LAN is an abbreviation always used today, its definition should be given with the today's world. History is another history.
Let me try to define LAN,
Network on a user's premises within a limited geographical area, consist of equipments (as ordinators, switches, routers) and physical links.
- It includes routers,
- A LAN could be composed with one orseveral bridged LAN
- LAN if full wired at the difference of the WLAN
- A local entre prise network is made of LAN an WLAN
Thanks for your words,
What is my definition of a LAN Network? I typically would actually refer to it as a LAN or a Local Area Network. LAN Network seems a bit redundant, but so does NIC Card (well I guess that depends on if NIC = Network Interface Card or Controller).
In any case, I think of a LAN as a local network. Not a network that connects across town, even in the case of metro ethernet. With a LAN, the enterprise typically owns all the components including all of the cabling and switches. This stuff is a bit grayer than it used to be. Today we often use LAN interfaces and technology to connect to a WAN.
Don't forget that a lot of those terms still appy in the wireless arena, because radio is a shared medium.
As far as learning the history, I think it is beneficial in the long run, but not necessarily required in the short term. Learning how networks work CURRENTLY, I believe is far more beneficial in getting a job or promotion in the near future. Long term, the more you know the better off you are regardless.
Edit to add - I usually reserve the "LAN" reference to a campus network, or a datacenter. The term "segment" I think is a better fit for small switched mediums say between routers for failover.
> Don't forget that a lot of those terms still appy in the wireless
> arena, because radio is a shared medium.
I was asking to myself if we can include WLAN in LAN.
We have this statement in 802.1D-2004 section 3.4:« IEEE 802 LANs (also referred to in the text simply as LANs) are LAN technologies that provide a MAC Service equivalent to the MAC Service defined in ISO/IEC 15802-1. IEEE 802 LANs include IEEE Std 802.3 (CSMA/CD), IEEE Std 802.5 (Token Ring), IEEE Std 802.11 (Wireless), and ISO 9314-2 (FDDI) LANs ».So,A 802 LAN include the WLAN and, of course, the Ethernet LAN doesn't include the WLAN.We are sure that the term LAN is not reserved to Ethernet.Best regards,Michel
> It is entirely possible that a router is connecting two or more LANs
> in the same local area. In that case, I'd still consider it a LAN.
I would go in this sense by mentioning the "edge routers" and the "internal routers".
And we come back to your suggestion with the "LAN interface" and the "WAN interface" of an "edge router".
A LAN is a network that is ended at the LAN interface of an edge router.
After, we can distinguish in that LAN several "bridged LAN" or "virtual bridged LAN".
The LAN (generical term) would include the internal routers, and not the edge routers.
A LAN could be an enterprise network, an administration network or the living room of Martin (that is a home or domestic network if the last qualifier is a good word for0 that).
Thanks for your comments,
What a neat discussion. Although those terms of collision domain, half duplex and shared media seem to be antiquated, it is aboslutely amazing to see how they still apply in todays networks. People still use hubs. All of those concepts still apply in the wireless arena, as Travis pointed out.
I would personally consider the WLAN an extension of the LAN as it uses the LAN as its backbone, typically. If the routing device aggregates one or more LANS to a point to point or point to multipoint link, I would consider that WAN. But if it is just allowing 2 broadcast domains to talk to each other with no aggregation to a 3rd network.... I wouldn't consider that a WAN.