Exam 400-101 Topic 9 Question 4 Discussion

Actual exam question for Cisco's 400-101 exam
Question #: 4
Topic #: 9
Refer to the exhibit.

Which statement is true about a valid IPv6 address that can be configured on interface tunnel0?

Suggested Answer: D Vote an answer

Most IPv6 networks use autoconfiguration, which requires the last 64 bits for the host. The first 64 bits are the IPv6 prefix. The first 16 bits of the prefix are always 2002:, the next 32 bits are the IPv4 address, and the last 16 bits of the prefix are available for addressing multiple IPv6 subnets behind the same 6to4 router. Since the IPv6 hosts using autoconfiguration already have determined the unique 64 bit host portion of their address, they must simply wait for a Router Advertisement indicating the first 64 bits of prefix to have a complete IPv6 address. A 6to4 router will know to send an encapsulated packet directly over IPv4 if the first 16 bits are 2002, using the next 32 as the destination, or otherwise send the packet to a well-known relay server, which has access to native IPv6.
Reference. http://en.wikipedia.org/wiki/6to4

by Gill at Sep 30, 2026, 01:46 AM

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