N10-009 Networking Concepts Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  2001:db8::1

  Why it's wrong here

  2001:db8::1 is an example of an IPv6 global unicast address, specifically falling within the 2001:db8::/32 prefix reserved for documentation and example purposes as defined in RFC 3849. Although it's a specific address, its nature as a global unicast address means it is intended to be routable across the internet, unlike link-local addresses which are strictly non-routable beyond their immediate segment. This address type is used for public, globally unique identification.

  When this WOULD be correct

  This option would be correct if the question asked for a global unicast address or an example of an IPv6 address used for documentation purposes.

• ✓

  fe80::1

  Why this is correct

  IPv6 link-local addresses, identified by the fe80::/10 prefix, are automatically configured on every network interface. These addresses are strictly confined to a single physical link and are not routable beyond that segment. Their primary purpose is for local-link communication, such as Neighbor Discovery Protocol (NDP) operations, stateless address autoconfiguration (SLAAC), and initial router discovery. fe80::1 is a valid example of such an address, often assigned to a host or a router's interface.

• ✗

  ff02::1

  Why it's wrong here

  ff02::1 is a well-known IPv6 multicast address specifically designated for the "all nodes on the link" group. Its scope is limited to the local link, meaning packets sent to this address will only reach devices directly connected to the same network segment. While it operates on the local link, it is fundamentally a multicast address used for group communication, not a unicast address assigned to a single interface for point-to-point communication like a link-local address.

  When this WOULD be correct

  This option would be correct if the question asked 'Which IPv6 address is used to reach all nodes on the local link?' or 'Which address is an IPv6 multicast address for all nodes?'

• ✗

  2000::/3

  Why it's wrong here

  The 2000::/3 prefix designates the entire range of IPv6 global unicast addresses, which are routable across the internet. This is a broad address block, not a specific individual address, and it is used for end-to-end communication between hosts on different networks globally. Unlike link-local addresses, which are confined to a single segment, addresses within the 2000::/3 range are designed for worldwide reachability and are assigned by Regional Internet Registries (RIRs).

  When this WOULD be correct

  This option would be correct if the question asked 'Which of the following is a valid IPv6 global unicast address prefix?' or 'Which prefix is used for global unicast addresses?'

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”