A company currently uses public IP addresses. However, recent acquisitions have caused the company to run out of IP address space. The company needs to migrate to a private IP address range but still allow all devices to communicate on the Internet. Which of the following is a private IP address that can be used by the company? (Select the best answer.)

Question

BlackTom AI · Accepted Answer

First, let's restate the problem in our own words and list the options so we can evaluate them carefully.
Question: A company needs to migrate from public IPs to private IP ranges but still have Internet connectivity for all devices. Which of the following is a private IP address that can be used?
Answer choices: A. 192.192.11.1  B. 172.31.3.16  C. 10.1.1.273  D. 11.12.13.14

Now, evaluate each option one by one:
Option A: 192.192.11.1
- Reasoning: Private IP ranges include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The address 192.192.11.1 does not fall into 192.168.0.0/16, so it is not a private address. Additionally, it falls outside the standard private blocks, so this is not suitable as a private range for internal use.

Option B: 172.31.3.16
- Reasoning: This address is in the 172.16.0.0/12 block (172.16.0.0 through 172.31.255.255), which is designated as private IPv4 space. Therefore, 172.31.3.16 is a valid private address that can be used internally while devices still access the Internet via a NAT gateway or similar mechanism.

Option C: 10.1.1.273
- Reasoning: The 10.0.0.0/8 block is private, but an IPv4 address must have each octet in the range 0–255. The last octet here is 273, which is invalid and cannot be used on a network. This is not a valid IP address at all, private or otherwise.

Option D: 11.12.13.14
- Reasoning: This address lies outside all private IPv4 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16). Consequently, it would be a public IP address, not suitable for a private address space.

Summary of reasoning for each option:
- A is invalid as private ranges do not include 192.192.x.x; it does not belong to 192.168.0.0/16 or any listed private block.
- B is valid because 172.31.3.16 resides in 172.16.0.0/12, a recognized private address space.
- C is invalid due to an out-of-range octet (273), making the address unusable regardless of private/public classification.
- D is invalid because 11.12.13.14 is not within any private range and would be a public IP.

Based on the above analysis, the best private IP address that can be used by the company is the one in the private 172.16.0.0/12 range: 172.31.3.16.

CS 410.01-Spring 2025 ST: Cyber Security Quiz 4

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