1Y0-A28 · Question #111
Scenario: A network engineer has created and bound an UDP-ECV monitor to identify the status of a UDP service. However, no matter what the response is, the service is always marked as UP. A possible…
The correct answer is A. forgot to add a receive string. Citrix 1Y0-A28 Exam
Question
Scenario: A network engineer has created and bound an UDP-ECV monitor to identify the status of a UDP service. However, no matter what the response is, the service is always marked as UP. A possible cause of this behavior is that the network engineer __________. (Choose the correct option to complete the sentence.)
Options
- Aforgot to add a receive string
- Badded the string ns_true as receive string
- Cadded a string that is invalid and thus skipped
- Dadded a string that is always part of the UDP handshake
How the community answered
(34 responses)- A76% (26)
- B6% (2)
- C3% (1)
- D15% (5)
Explanation
Citrix 1Y0-A28 Exam
Topics
Community Discussion
7
Ola B.May 4, 2026The UDP-ECV monitor works by sending a request string to the service and then checking the response against whatever receive string you configured. If you leave the receive string blank, the NetScaler has nothing to match against, so it treats any response as a valid "up" condition and marks the service UP every single time. That is exactly what option A describes, and it is the right answer here. The other options would either cause a false negative or simply are not how the monitor behaves, since ns_true is actually a valid string that forces the monitor to always consider the service UP, which is a different scenario from a missing receive string entirely. The best way to lock this in is to spin up a lab, bind a UDP-ECV monitor to a test service, and intentionally leave the receive string empty, then watch the service stay green no matter what you throw at it. Once you add a specific receive string that only matches a known good response, you will see the monitor actually discriminate between good and bad states. That hands-on comparison sticks with you far longer than just reading the answer.
Mei-Ling H.May 6, 2026Good breakdown, but worth flagging that ns_true is used as the send string value, not the receive string, so the exam is testing two completely different configuration fields and conflating them in your notes will cost you on a question that specifies which field is being set.
Kemal J.Apr 10, 2026Saw this one and almost picked B, but an empty receive string always passes. A.
Mei-Ling H.Apr 11, 2026Right, and notice they used "always" in the explanation, which normally flags a wrong answer, but here it is actually correct, so the trap is that your test-taking instinct to distrust absolutes works against you.
Carlos M.Apr 15, 2026A is right, but D is the sneaky one that trips people up if you're not careful because UDP has no handshake, so D is actually nonsense and should have been an easy eliminate. With ECV monitors, if you skip the receive string the monitor just checks that the send string goes out and defaults to UP regardless of what comes back, so yeah, forgetting to add a receive string is your culprit here.
Mei-Ling H.Apr 29, 2026Forgot this one on my exam, service stayed UP no matter what I sent. The receive string is what decides DOWN, blank means always UP, option A.
Ola B.May 2, 2026Blank receive string means the health check never matches a DOWN condition, so the service stays UP by default, but worth noting that if you leave both the send and receive strings blank the monitor is essentially just checking TCP connectivity and you might miss application-layer failures.