CERTIFIED-IN-CYBERSECURITY · Question #479
CERTIFIED-IN-CYBERSECURITY Question #479: Real Exam Question with Answer & Explanation
The correct answer is C: 2003:ab8::eeee:0:1. In IPV6 addressing, leading zeros in a group can be omitted, and consecutive groups of zeros can be represented as '::'. However, '::' can only be used once in an address. Therefore, the IPV6 address '2003:0ab8:0000:0000:0000:eeee:0000:0001' can be shortened to '2003:ab8::eeee:0:
Question
Which of the following best illustrates a shortened version of the IPV6 address 2003:0ab8:0000:0000:0000:eeee:0000:0001?
Options
- A2003:0ab8::eeee:0:0001
- B2003:ab8::eeee:0000:1
- C2003:ab8::eeee:0:1
- D2003:0ab8:0:eeee::1
Explanation
In IPV6 addressing, leading zeros in a group can be omitted, and consecutive groups of zeros can be represented as '::'. However, '::' can only be used once in an address. Therefore, the IPV6 address '2003:0ab8:0000:0000:0000:eeee:0000:0001' can be shortened to '2003:ab8::eeee:0:1' (see ISC2 Study Guide, Chapter 4, Module 1). For example, if a network device has an IPV6 address of '2003:0ab8:0000:0000:0000:eeee:0000:0001', it can be represented in a more compact form as "2003:ab8::eeee:0:1". This shortened form is easier to read and write, while still uniquely identifying the device on the network. The other options are incorrect because they do not properly apply the rules for truncating IPV6 addresses. The option '2003:ab8::eeee:0000:1' incorrectly omits the null group after 'eeee'. The '2003:0ab8:0:eeee::1' option incorrectly includes a null group before 'eeee' and uses '::' twice. The option '2003:0ab8::eeee:0:0001' incorrectly includes leading zeros in the last group. These errors violate the IPV6 address truncation rules, making these options incorrect.
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