Cisco Certified Network Professional (CCNP) Question:
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What are the access, distribution, and core components of a North American phone number?

Answer:

The last four digits are the used at the access layer to identify a particular telephone. The next three numbers are used at the distribution layer to identify an exchange that services several phone numbers. The area code is used at the core level for routing between different regions.

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What are the access, distribution, and core components of a postal address?This is a speed drill. Using only your head, convert the following binary numbers to decimal.

11100000

11111100

10000000

11110000

00111111