CC Exam Dumps | Which addresses are reserved for internal network use and are not routable on the Internet?

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ISC.CC.v2026-07-17.q172
Question 125

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Question 125/172

Which addresses are reserved for internal network use and are not routable on the Internet?

A. ac00:: to adff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

B. fc00:: to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

C. bc00:: to bdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

D. cc00:: to cdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Correct Answer: B

The IPv6 address rangefc00::/7, which includesfc00:: to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff, is reserved forUnique Local Addresses (ULAs). ULAs are the IPv6 equivalent of private IPv4 addresses (such as 10.0.0.0
/8 or 192.168.0.0/16). These addresses are intended for internal communications within an organization and arenot routable on the public Internet.
ULAs allow organizations to design internal IPv6 networks without relying on globally routable addresses.
This enhances security by reducing external exposure and simplifies internal network design. According to RFC 4193, ULAs are designed to be globally unique within private networks while remaining isolated from the public Internet.

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