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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Trouble Ticket 5 Frame Relay/ISDN Backup Lab

On the WAN you are interfacing with service providers no matter what service you use. When it is critical that remote offices communicate with headquarters or each other, normally some type of automatic failover is in place until the network recovers. Redundancy is one thing; problem diagnosis is another.

Suppose you get a call from a user indicating that “things are slow.” Slow compared to what? Is the underlying cause a throughput issue or that of response time. A large file transfer will be limited by bandwidth, for example, whereas a transaction processing system will be limited by latency (lots of end-to-end trips). Ultimately, you must characterize whether you are dealing with a user complaint ...

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