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You are here: Home / ICND2 / Day 41 – Wide Area Networking / Day 41 Tasks / Troubleshooting WAN Connections

Troubleshooting WAN Connections

When trying to bring up a WAN connection (forgetting PPP and Frame Relay for the moment), you could use the OSI model:

Layer 1 – Check the cable to ensure that it is attached correctly. Has the no shut command been applied? Is there a clock rate applied to the DCE side?

RouterA#show controllers serial 0
HD unit 0, idb = 0x1AE828, driver structure at 0x1B4BA0
buffer size 1524 HD unit 0, V.35 DTE cable

RouterA#show ip interface brief
Interface     IP-Address     OK? Method Status              Protocol
Serial0       11.0.0.1       YES . . .

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