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A website uses HTTPS but the browser shows a warning. What is the most likely cause?

medium📝 Analysis Q6 of Q15
Intro to Computing - How the Internet Works
A website uses HTTPS but the browser shows a warning. What is the most likely cause?
AThe website's SSL certificate is expired or invalid
BThe website is loading too slowly
CThe website uses HTTP instead of HTTPS
DThe browser does not support images
Step-by-Step Solution
Solution:
  1. Step 1: Understand HTTPS warnings

    Browsers warn users if SSL certificates are expired, invalid, or untrusted.
  2. Step 2: Exclude other causes

    Slow loading, HTTP usage, or image support do not cause HTTPS warnings.
  3. Final Answer:

    The website's SSL certificate is expired or invalid -> Option A
  4. Quick Check:

    HTTPS warning = SSL certificate problem [OK]
Quick Trick: Expired SSL certificates cause browser warnings [OK]
Common Mistakes:
MISTAKES
  • Confusing slow loading with security warnings
  • Ignoring certificate validity
  • Blaming browser image support

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