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Re: [PLUG] Re: Verizon DSL
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On Friday 07 June 2002 10:19 am, you wrote:
> This is what I don't get. What does this "access" consist of? Clearly
> there has to be more than simply a physical wire. I understand that, but
> *what* do I get from the ISP? Surely one could say "everything else
> besides the physical wire", but that wouldn't tell me what I want to know.
>
> If one of my computers sends an IP packet out over my DSL line, the DSL
> line provider has to be able to handle the packet... or does it? Does it
> act in some way like a leased line to my ISP? Could I use an ISP in
> Alaska if I wanted to? Or just ones that have some prearranged agreement
> with Verizon in this region?
You have to understand networking Layers. (OSI)
(this is a model, not a protocol)
Verizon is supplying:
Level 1 - The actual Physical/Electrical Protocols for running over the DSL
Line. Ethernet boards and hubs live here.
Level 2 - Also called data link Etherrnet, PPPOE. Approximately the mac
layer. 802.3 and all that good stuff. Ethernet switches.
ISP starts here.
Level 3 - Networking Here is where the internet and Your ISP start. IP lives
here. Here is where you need an ISP and an IP assigned. Routers live here.
Level 4 Transport. This is TCP. UDP, Etc
Levels 5, 6, 7 session, presentation and application. Higher level stuff
lives here. SMTP, http, ftp etc.
Main point - Verizon handles 1 and 2. ISP and internet starts at 3.
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