100-150 Question 82
Select 3You are troubleshooting a network that uses IPv6 addressing. You come across the following address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64. Which of the following statements about this address are correct?
- A
It is a global unicast address.
- B
The prefix length of the address is 128 bits.
- C
The network portion of the address is identified by the first 64 bits.
- D
This address is reserved for documentation and example purposes.
- E
The address includes an embedded IPv4 address.
Show answer and explanation
Correct answers: A, C, D
Explanation
The IPv6 address 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64 belongs to the 2001:0db8::/32 range, which is reserved for documentation and examples. It is also a global unicast address, as it falls within the 2000::/3 range. The /64 prefix length specifies that the first 64 bits represent the network portion. However, the address does not include an embedded IPv4 address.
- A. Correct.
This is correct. The address belongs to the global unicast address range, which starts with 2000::/3.
- B. Incorrect.
This is incorrect. The prefix length is specified as /64, meaning the first 64 bits represent the network portion, not 128 bits.
- C. Correct.
This is correct. In IPv6, a /64 prefix length indicates that the first 64 bits of the address represent the network portion.
- D. Correct.
This is correct. IPv6 addresses with the 2001:0db8::/32 prefix are reserved for documentation and example purposes.
- E. Incorrect.
This is incorrect. The address does not include an embedded IPv4 address, which would typically appear in IPv4-mapped or IPv4-compatible IPv6 addresses.