Cisco Certified Network Professional (CCNP) Question:
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Assume a router has a loopback address of 135.77.9.254. Convert the loopback address to an IS-IS system ID.

Answer:

The loopback address written in dotted decimal and using three digits for each byte has a value of 135.077.009.254. The system ID is 13.50.77.00.92.54.

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