200-101 · Question #154
Which statement about IPv6 is true?
The correct answer is D. Broadcasts have been eliminated and replaced with multicasts. IPv6 eliminates the concept of broadcast entirely. Functions that previously relied on broadcasts (such as address resolution and router discovery) are handled through targeted multicast groups instead-for example, the solicited-node multicast address replaces ARP broadcasts…
Question
Options
- AAddresses are not hierarchical and are assigned at random.
- BOnly one IPv6 address can exist on a given interface.
- CThere are 2.7 billion addresses available.
- DBroadcasts have been eliminated and replaced with multicasts.
How the community answered
(38 responses)- A3% (1)
- B5% (2)
- C3% (1)
- D89% (34)
Explanation
IPv6 eliminates the concept of broadcast entirely. Functions that previously relied on broadcasts (such as address resolution and router discovery) are handled through targeted multicast groups instead-for example, the solicited-node multicast address replaces ARP broadcasts, and the all-routers multicast address replaces broadcast-based router discovery. A is incorrect: IPv6 addresses are hierarchical, designed for efficient routing aggregation. B is incorrect: an IPv6 interface can have multiple addresses simultaneously (link-local, global unicast, etc.). C is incorrect: IPv6 provides 2^128 (approximately 340 undecillion) addresses-vastly more than 2.7 billion (which is closer to the IPv4 space of ~4.3 billion).
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