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6.6

WAN and the OSI layers

Asked by Snap-0-Spine in Miscellaneous Networking, TCP/IP, Application Protocols

Tags: layers, osi, data, devices, wan

Here's a question are teacher presented us the other day:  Why do Wide Area Networks ONLY focus on the physical and data link layers? I cant just outright ask the teacher for the answer because its for bonus points. So I figured i'd come to you guys. I understand WANs use the physical layer by sending electrical pulses over telephone lines and what not. And I understand WANs use the data link layer by using mac addresses of devices such as the CSU/DSU. But, why isn't the network layer included? Routers, a key part of WANs, work off of this layer to route information. Also, packet-switched networks within the telephone company are based on the PDU of the network layer, the PACKET! What am I missing here, or is this just a trick question that my teacher has used just to get the gears in my head turning? Please help!
[+][-]11/03/04 04:26 PM, ID: 12488952Expert Comment

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[+][-]11/03/04 04:58 PM, ID: 12489111Accepted Solution

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About this solution

Zones: Miscellaneous Networking, TCP/IP, Application Protocols
Tags: layers, osi, data, devices, wan
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Solution Provided By: wmilliga
Participating Experts: 4
Solution Grade: A
 
[+][-]11/03/04 05:08 PM, ID: 12489162Expert Comment

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