JN0-102 · Question #7
Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?
The correct answer is C. 2001:0:1000::cbff:20:1/64. The question asks for the correctly simplified version of a given full IPv6 address, applying standard simplification rules.
Question
Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?
Options
- A2001::1::cbff:2:0001/64
- B2001::1000::cbff:20:1/64
- C2001:0:1000::cbff:20:1/64
- D2001:0:1:0:0:cbff:2:1/64
How the community answered
(49 responses)- A2% (1)
- B8% (4)
- C86% (42)
- D4% (2)
Why each option
The question asks for the correctly simplified version of a given full IPv6 address, applying standard simplification rules.
This address uses a double-colon '::' twice, which is an invalid simplification as only one '::' is allowed per IPv6 address.
This simplification incorrectly omits the '0' hextet after 2001 and uses a second invalid double colon.
The original address 2001:0000:1000:0000:0000:cbff:0020:0001/64 simplifies by removing leading zeros from hextets (e.g., 0000 becomes 0, 0020 becomes 20, 0001 becomes 1) and replacing the longest contiguous block of zero hextets (0000:0000) with a double colon '::', resulting in 2001:0:1000::cbff:20:1/64.
This address incorrectly simplifies 1000 to 1 and does not use the double-colon rule for the longest zero segment, making it less simplified.
Concept tested: IPv6 address simplification rules
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipv6/ipv6-basics#ipv6-address-format
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