Drag and Drop Question Drag and drop the IPv6 address from the left onto the type on the right. Answer:

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Explanation

IPv6 Address Type Identification

IPv6 address types are identified by their prefix bits - the first few characters tell you everything.

1. 2000:... -> Global Unicast

Prefix: 2000::/3 (addresses starting with binary 001, i.e., 2000:: through 3FFF::)

• These are the IPv6 equivalent of public IPv4 addresses - routable on the global internet.
• Any address starting with 2 or 3 falls in this range.
• Common mistake: Confusing these with private addresses. In IPv6, 2000::/3 is explicitly the globally routable space, assigned by IANA/RIRs.

2. fc00:... -> Unique Local

Prefix: fc00::/7 (addresses starting with FC or FD)

• Equivalent to IPv4 private ranges (10.x, 172.16.x, 192.168.x) - not routable on the internet.
• FC00::/8 is technically reserved; FD00::/8 is the commonly used subrange.
• Common mistake: Confusing Unique Local (FC/FD) with Link-Local (FE80). Both are "private" but serve different scopes - Unique Local can span a site/organization; Link-Local is single-link only.

3. fe80:... -> Link-Local Unicast

Prefix: fe80::/10 (addresses starting with FE80 through FEBF)

• Automatically assigned to every IPv6-enabled interface; used for communication on the same network segment only.
• Never routed beyond the local link. Used for neighbor discovery (NDP), router discovery, etc.
• Common mistake: Thinking fe80 addresses need to be manually configured - they're auto-generated (often from the MAC address via EUI-64).

4. ff00:... -> Multicast

Prefix: ff00::/8 (all addresses starting with FF)

• Used to send traffic to multiple recipients simultaneously.
• Replaces IPv4 broadcast; there is no broadcast in IPv6 - multicast handles all those use cases.
• Common mistake: Confusing multicast (FF) with anycast. Anycast addresses look identical to unicast - they're distinguished only by configuration, not by prefix.

Quick Reference Cheat Sheet

The key skill is recognizing the first two hex characters of the address - that alone identifies the type in all four cases on this exam.

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