Which of the following is a probe protocol that health checks cannot support?

Question

Options

• ARADIUS
• BCHCMP
• CDNS
• DUDP

• A
  4% (1)
• B
  4% (1)
• C
  16% (4)
• D
  76% (19)

Explanation

UDP is connectionless - it fires packets without establishing a session or expecting an acknowledgment, so a health check system has no reliable mechanism to confirm a remote service actually received and responded to the probe. This fundamental statelessness makes pass/fail determination impossible at the transport layer.

Why the distractors are wrong:

• A (RADIUS): Health checks can probe RADIUS by sending an authentication request and verifying a valid Accept/Reject response, confirming the service is alive.
• B (CHCMP): This is a supported probe protocol in certain health-check implementations, so it can be monitored.
• C (DNS): Health checks can send a DNS query and validate a proper response, making DNS a supported probe type.

Memory tip: Think of UDP as "Unverifiable Delivery Protocol" - because there's no handshake or guaranteed response, a health checker is essentially shouting into the void with no way to know if anyone's home.

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