19 - Wireless LAN - Foundation Concepts and Design 1

Only 1 person can send or receive at a time, more users joining the wireless network the less the performance you get.

The unlicensed bands is an issue (one of the downfalls) ... as there are only 3 clean channels (b+g)

not much you can do if other networks/peoples APs use these channels.... other than changing

over to another wireless standard, but point being is no governing authority you can go to.

We all remember CSMA/CD (just about from our NA studies) which would listen first to see if the wire was free then send data, well with wireless it uses CA (collision avoidance) - sounds familiar right, dig deep in that head, yes thats right, the same as token ring! lol

 

20 - Wireless LAN - Foundation Concepts and Design 2

client joins ap 1, gets 172.16.1.50 then comes into radius of ap 2, the client joins ap 2 ...(but how i hear you ask ...as if we assign him a new ip, all his existing connections with be severed..)

he then pretty much becomes vpn enabled (almost) he gets an encapsulated IP address (so he keeps 172.16.1.50 - thats retained, which is encapsulated within the 2.50 packet) kinda vpn styleeee (kinda on the fly) and vice versa when he goes back into AP1 he is decapsulated.

this keeps all connections ...koooool