Cisco 400-051 Exam

What is the maximum length of any numeric geographic area address in ITU recommendation E.164?

  • A. 15
  • B. 18
  • C. 21
  • D. 22
  • E. 25
Answer: Option A. 

E.164 defines a general format for international telephone numbers. Plan-conforming numbers are limited to a maximum of 15 digits. The presentation of numbers is usually prefixed with the character + (plus sign), indicating that the number includes the international country calling code (country code), and must typically be prefixed when dialing with the appropriate international call prefix, which is a trunk code to reach an international circuit from within the country of call origination.

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