Internet Protocol Version 6 (IPv6) Practice Test 2026 - Free IPv6 Practice Questions and Study Guide

Think in terms of hextets: an IPv6 address is eight 16‑bit blocks, written in full notation as four hex digits per block. A non-zero hextet is any block that isn’t 0000. In the given address, the blocks are fddd, f00d, cafe, 0000, 0000, 0000, 0000, 0001. The non-zero ones are fddd, f00d, cafe, and 0001. That makes four blocks with non-zero values. So the number is four.