Which of the following descriptions about URL black and white lists is incorrect?

Question

Options

• ABlack and white lists can be used in conjunction with URL classification
• BGenerally, large web pages will embed links to other web pages. If only the main web page is
• CThe black and white list has the highest matching priority, higher than custom URL categories and
• DThe priority of the blacklist is higher than that of the whitelist

• A
  4% (1)
• B
  14% (4)
• C
  7% (2)
• D
  75% (21)

Explanation

Option D is incorrect because in URL filtering systems, the whitelist actually holds higher priority than the blacklist - not the other way around. When a URL matches both lists, the whitelist wins, allowing the traffic. This design ensures that explicitly trusted URLs are never accidentally blocked by blacklist rules.

Why the distractors are correct (and therefore not the answer):

• A is true: Black/white lists integrate well with URL categorization, allowing a layered filtering approach where explicit rules and category-based rules work together.
• B is true (though truncated): Embedded links in web pages can bypass filtering if only the main page URL is checked, which is a known limitation of URL filtering that admins must account for.
• C is true: Explicit black/white list entries do carry the highest matching priority, overriding both custom URL categories and predefined categories - explicit always beats general.

Memory tip: Think "White beats Black at the door." The whitelist is the VIP pass that overrides everything - if you're on the whitelist, no blacklist can stop you. This mirrors real-world security logic: trust (whitelist) is harder to earn but grants more power than suspicion (blacklist).

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