Which of the following descriptions of health examinations is incorrect?

Question

Options

• AHealth check supports DNS detection protocol
• BThe firewall can sense network connectivity in real time through the health check results.
• CThe health check function does not support use in conjunction with policy routing.
• DIn addition to detecting link connectivity, health check can also detect link delay, jitter and packet

• A
  7% (2)
• B
  14% (4)
• C
  76% (22)
• D
  3% (1)

Explanation

Option C is the incorrect description because health check does support use with policy routing - this is actually one of its primary use cases. When a health check detects a link failure, policy routing can automatically redirect traffic to a backup path, making the two features complementary, not incompatible.

Why the distractors are wrong (i.e., they are all true statements):

• A is correct: health check supports multiple detection protocols including DNS, ICMP, and TCP, so DNS detection is valid.
• B is correct: firewalls use health check results to update routing and forwarding decisions in real time, enabling dynamic response to link failures.
• D is correct: beyond basic connectivity, health check can measure link quality metrics such as delay, jitter, and packet loss to assess link performance holistically.

Memory tip: Remember the phrase "Health check and policy routing are partners, not rivals." If an exam option says these two features are incompatible or unsupported together, that's your red flag - their whole value lies in working together to detect failures and reroute traffic automatically.

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