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Difficulty: EasyIPv6 Addressing and Prefixes

An administrator is reviewing IPv6 address scopes and interface identifier generation rules. Which of the following statements correctly describe standard IPv6 address prefixes and EUI-64 requirements? (Select TWO.)

  1. The IPv6 prefix fe80::/10 is designated for link-local unicast addressing on a local segment.Answer
  2. B
    In EUI-64 interface ID generation, the hex value FFFF is inserted into the middle of the MAC address without modifying any bits.
  3. The IPv6 prefix ff00::/8 is reserved for multicast addresses.Answer
  4. D
    An IPv6 subnet with a /64 prefix length subtracts two host addresses from the total range to account for dedicated network and broadcast addresses.

Answer

The statement identifying fe80::/10 as link-local unicast addressing and the statement identifying ff00::/8 as multicast addressing are both correct.
The prefix fe80::/10 is defined in RFC 4291 for link-local unicast addressing, while ff00::/8 is reserved for IPv6 multicast traffic.

Step-by-Step Solution

1
Evaluate the reserved IPv6 scope prefixes.
fe80::/10 is confirmed as Link-Local and ff00::/8 is confirmed as Multicast.
Standard IPv6 RFC specifications assign fe80::/10 to link-local unicast communication and ff00::/8 to multicast.
2
Evaluate EUI-64 identifier construction.
The statement claiming FFFF insertion without bit flipping is false.
EUI-64 requires inserting FFFE into the MAC address midpoint and inverting the 7th bit (U/L bit).
3
Evaluate IPv6 broadcast and subnet host calculations.
The statement claiming two host addresses are subtracted for network and broadcast IDs is false.
IPv6 eliminates traditional subnet broadcast addresses in favor of multicast.

Key Concept

IPv6 Address Scopes and EUI-64 Identifier Rules
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Topics

IPv6 Addressing and Prefixes

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