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Exam 300-420 topic 1 question 190 discussion

Actual exam question from Cisco's 300-420
Question #: 190
Topic #: 1
[All 300-420 Questions]

A company plans to transition to IPv6. They will link their IPv4 addresses to the lowest significant bits of the new Ipv6 addresses. A network administrator with an employee id: 4264:42:116 is preparing a mapping schema for the new IPv6 addresses. Which address does the 172.16.10.0/24 network translate to?

  • A. 2001:db8:abcd::ac10:a00/120
  • B. 2001:db8:abcd:172:16:10::/96
  • C. 2001:db8:abcd:11d8:a00/120
  • D. 2001:db8:ac10:0a00::/64
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Suggested Answer: A 🗳️
by leo_591 at Oct. 14, 2022, 2:33 p.m.

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Eards
Highly Voted 2 years ago
I think A: ac10:a00 = 172.16.10.0 and /120 = /24
upvoted 5 times
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leo_591
Highly Voted 2 years ago
A: IPv6 Address Allocation Completely Linked to IPv4
upvoted 5 times
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neiker45
Most Recent 10 months, 1 week ago
Ignore the employee ID on the questions. They're just used to add useless information and confuse you,
upvoted 1 times
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mgiuseppe86
1 year, 1 month ago
Selected Answer: A
172 = 1010|1100 = AC 016 = 0001|0000 = 10 010 = 0000|1010 = 0A 000 = 0000|0000 = 0 /120 = 256 IPs in IPv6 which is equal to a /24 in iIPv4
upvoted 3 times
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akbntc
1 year, 1 month ago
Selected Answer: A
".... IPv4 addresses to the lowest significant bits of the new Ipv6 addresses". Lowest significant bits is the keyword here. You will need to put the hex-converted IPV4 address to the end with 8 bits left for host addressing (equivalent of /24 IPV4).
upvoted 1 times
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beskar
1 year, 2 months ago
Selected Answer: D
Answer would need to be D according to the binary to hex conversion 10 = 0a in hex and the only option that mirrors this is D.
upvoted 2 times
beskar
1 year, 2 months ago
Nevermind. A seems right. Didn't notice the leading 0 is missing in A.
upvoted 1 times
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vangio
1 year, 3 months ago
Correct B
upvoted 1 times
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Reinier_veen
2 years ago
Selected Answer: A
" link their IPv4 addresses to the lowest significant bits " THis can never be a /64 network but must me a /120 network.
upvoted 4 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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