Multiple choice

Which of the following digits are known as area code of Network User Address (NUA)?

  1. 5—7

  2. 1—4

  3. 8—12

  4. 13—14
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A Correct answer
Explanation

In the X.121 standard for Network User Addresses (NUA), the Data Network Identification Code (DNIC) occupies the first 4 digits, while the area code or network-specific digits typically follow in the 5-7 range.

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