350-401 · Question #750
How does an IPv6 host automatically generate a global address?
The correct answer is B. It appends its interface identifier to the network prefixes contained in Router Advertisement. An IPv6 host automatically generates a global address by combining a network prefix from a Router Advertisement with its interface identifier.
Question
Options
- AIt prepends its interface identifier to the network prefixes contained in Router Advertisement
- BIt appends its interface identifier to the network prefixes contained in Router Advertisement
- CIt appends its interface identifier to the network prefixes contained in Router Solicitation
- DIt prepends its interface identifier to the network prefixes contained in Router Solicitation
How the community answered
(29 responses)- A7% (2)
- B86% (25)
- C3% (1)
- D3% (1)
Why each option
An IPv6 host automatically generates a global address by combining a network prefix from a Router Advertisement with its interface identifier.
The interface identifier is appended, not prepended, to the network prefix during SLAAC address generation.
Stateless Address Autoconfiguration (SLAAC) allows an IPv6 host to form its global unicast address by appending its interface identifier (e.g., EUI-64) to the network prefixes received in a Router Advertisement (RA) message from an IPv6 router.
Router Solicitation messages are used by hosts to request Router Advertisements, but the address prefixes themselves are contained within Router Advertisement messages, not Router Solicitations.
The interface identifier is appended, not prepended, and the network prefixes for automatic global address generation are found in Router Advertisement messages, not Router Solicitations.
Concept tested: IPv6 SLAAC address generation
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/xe-3s/ipv6-xe-3s-book/ip6-slaac.html
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