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An administrator accidentally sets two A records for the same subdomain pointing to different IPs. What is the likely effect?

medium📝 Debug Q7 of 15
AWS - Route 53
An administrator accidentally sets two A records for the same subdomain pointing to different IPs. What is the likely effect?
ADNS will randomly return one of the IPs
BDNS will return an error and block access
CDNS will merge the IPs into one
DDNS will ignore both records
Step-by-Step Solution
Solution:

  1. Step 1: Understand multiple A records

    Multiple A records for one name create a round-robin effect for load balancing.

  2. Step 2: Predict DNS behavior

    DNS randomly returns one IP from the list to distribute traffic.

  3. Final Answer:

    DNS will randomly return one of the IPs -> Option A

  4. Quick Check:

    Multiple A records = random IP return [OK]
Quick Trick: Multiple A records enable simple load balancing [OK]
Common Mistakes:
  • Expecting DNS error
  • Thinking IPs merge
  • Assuming DNS ignores duplicates

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