The answer is that the router is experiencing a memory leak or exhaustion in the Processor pool, as indicated by the repeated %SYS-2-MALLOCFAIL messages. This error occurs when a process—here identified by PID 0x12345678—attempts to allocate memory from the Processor pool but fails, typically because the pool has been depleted due to a leak or fragmentation. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to differentiate between memory pool types: the Processor pool handles critical system and process memory, while the I/O pool handles packet buffers. A common trap is to assume the I/O pool is at fault, but the log explicitly names the Processor pool, pointing to a process-level memory issue rather than a buffer overflow. Remember the mnemonic “MALLOCFAIL means memory’s on trial”—if the Processor pool is failing, suspect a leaking process, not a packet flood.
300-410 Network Logging and Syslog Practice Question
This 300-410 practice question tests your understanding of network logging and syslog. 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.
A network engineer runs the following command on Router R7:
R7# show logging | include %SYS-2-MALLOCFAIL
*Mar 1 00:05:10.123: %SYS-2-MALLOCFAIL: Memory allocation failed for size 1024, from process 0x12345678, pool Processor
*Mar 1 00:06:20.456: %SYS-2-MALLOCFAIL: Memory allocation failed for size 2048, from process 0x12345678, pool Processor
*Mar 1 00:07:30.789: %SYS-2-MALLOCFAIL: Memory allocation failed for size 512, from process 0x12345678, pool Processor
Based on this output, what is the most likely problem?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router has a memory leak or is running out of memory in the Processor pool.
The output shows memory allocation failures in the Processor pool. This indicates that the router is running low on memory, which can cause various issues including process crashes, inability to allocate buffers, and overall instability. The process ID 0x12345678 is likely a specific process that is consuming memory or failing to allocate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 router has a memory leak or is running out of memory in the Processor pool.
Why this is correct
Multiple MALLOCFAIL messages indicate that the router cannot allocate memory, which is a sign of memory exhaustion or a leak.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The router is experiencing high CPU utilization due to routing protocol updates.
Why it's wrong here
CPU utilization is not directly indicated by memory allocation failures.
✗
The router's logging buffer is full and cannot store new messages.
Why it's wrong here
Logging buffer fullness does not cause memory allocation failures.
✗
The router has a hardware failure in the memory module.
Why it's wrong here
While possible, software memory exhaustion is more likely than hardware failure, and the message does not indicate hardware error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Logging and Syslog — This question tests Network Logging and Syslog — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router has a memory leak or is running out of memory in the Processor pool. — The output shows memory allocation failures in the Processor pool. This indicates that the router is running low on memory, which can cause various issues including process crashes, inability to allocate buffers, and overall instability. The process ID 0x12345678 is likely a specific process that is consuming memory or failing to allocate.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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