The correct answer is that the script will cause an infinite loop. This happens because calling gr.update() inside a while loop on the same GlideRecord query triggers any associated business rules or database triggers, which may re-query the same record set and cause the loop to iterate indefinitely—a classic anti-pattern in ServiceNow development. On the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding of GlideRecord lifecycle and the dangers of modifying records within their own iteration loop. A common trap is assuming that setValue syntax or next() logic is the problem, but the real issue is the recursive update cycle. Remember the memory tip: never update the same GlideRecord set inside its own loop—always use a separate GlideRecord instance or a glideAggregate to avoid the loop trap.
SNOW-CAD Practice Question: Application development using ServiceNow Studio
This SNOW-CAD practice question tests your understanding of application development using servicenow studio. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
var gr = new GlideRecord('incident');
gr.addQuery('state', 1);
gr.query();
while(gr.next()) {
gr.setValue('priority', 2);
gr.update();
}
Refer to the exhibit. What is the primary issue with this script if it is intended to update all incidents in state 'New' (state=1) to priority 2?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The script will cause an infinite loop.
Option A is correct. Using gr.update() inside the while loop on the same GlideRecord object can cause an infinite loop if any business rule or trigger re-queries the same record set. This is a known anti-pattern. Option B is incorrect because setValue syntax is fine. Option C is partially true but not the primary issue. Option D is incorrect because next() iterates correctly.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The script will not update any records because of a syntax error in setValue.
Why it's wrong here
setValue syntax is correct.
✗
The script will update only the first record because next() is used incorrectly.
Why it's wrong here
next() is used correctly in a while loop.
✓
The script will cause an infinite loop.
Why this is correct
Updating the same record while iterating over it can trigger conditions that requery the record, leading to an infinite loop.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The script will update records but may cause performance issues.
Why it's wrong here
Performance issues are secondary; the loop risk is more critical.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SNOW-CAD NAT questions on configuration and troubleshooting.
Application development using ServiceNow Studio — This question tests Application development using ServiceNow Studio — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The script will cause an infinite loop. — Option A is correct. Using gr.update() inside the while loop on the same GlideRecord object can cause an infinite loop if any business rule or trigger re-queries the same record set. This is a known anti-pattern. Option B is incorrect because setValue syntax is fine. Option C is partially true but not the primary issue. Option D is incorrect because next() iterates correctly.
What should I do if I get this SNOW-CAD question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SNOW-CAD NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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