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Which IP address would most likely be assigned to a home router's public interface?

medium📝 Analysis Q5 of 15
Computer Networks - IP Addressing
Which IP address would most likely be assigned to a home router's public interface?
A203.45.67.89
B172.20.10.5
C192.168.0.1
D10.1.1.1
Step-by-Step Solution
Solution:

  1. Step 1: Identify private vs public IPs

    192.168.x.x, 172.16.x.x-172.31.x.x, and 10.x.x.x are private IP ranges.

  2. Step 2: Check which IP is public

    203.45.67.89 is outside private ranges, so it is a public IP suitable for router's internet interface.

  3. Final Answer:

    203.45.67.89 -> Option A

  4. Quick Check:

    Public IPs are outside private ranges [OK]
Quick Trick: Public IPs are outside private IP ranges [OK]
Common Mistakes:
MISTAKES
  • Choosing private IPs as public
  • Not knowing private IP ranges
  • Assuming all IPs starting with 1 or 2 are public

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