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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Chapter 9's Review Questions

1: Why do interface resets occur?
A1: Answer: Interface resets occur when the interface has been completely reset, which normally is from cabling or signaling issues. The system resets the interface automatically if it sees that the physical interface is up, but the line protocol is down. Carrier transitions occur when an interruption in signal occurs. If DCD goes down and then back up, for example, that is two transitions. If they continue to increase, check the cabling or other attached hardware. If output drops also increase, the problem may be congestion.
2: True or false: The ISDN signaling protocol is LAPB for the D channel.
A2: Answer: False. LAPB is for X.25. LAPD is the signaling protocol for the ISDN D channel. ...

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