The answer is 50%. This is correct because the ARP drop rate percentage is calculated by dividing the number of dropped ARP packets by the total ARP packets received, then multiplying by 100, yielding (500/1000)*100 = 50%. On the Cisco DCCOR 350-601 exam, this calculation tests your ability to interpret interface statistics or packet capture exhibits, often presented in a scenario where ARP spoofing, security features like Dynamic ARP Inspection, or hardware resource exhaustion causes drops. A common trap is confusing the drop rate with the success rate or misreading the total versus dropped counts in the exhibit. Remember the formula as “Drops over Total, times one hundred” and a quick memory tip: “Half dropped, half kept — 50% is correct.”
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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
Refer to the exhibit.
! Nexus 7000 CoPP policy
class-map type control-plane match-all COPP-CLASS-ARP
match protocol arp
!
policy-map type control-plane COPP-POLICY
class COPP-CLASS-ARP
police cir 1000 bc 1000
conform-action transmit
exceed-action drop
!
control-plane
service-policy input COPP-POLICY
! Output of 'show policy-map interface control-plane'
Control Plane
service-policy input: COPP-POLICY
class-map COPP-CLASS-ARP (match-all)
462 packets, 462 bytes
5 minute offered rate 2000 pps
conform: 231 packets, 231 bytes
exceed: 231 packets, 231 bytes
An engineer observes that ARP packets are being dropped. Based on the exhibit, what is the drop rate percentage for ARP packets?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
50%
The exhibit shows that out of 1000 total ARP packets, 500 were dropped. The drop rate percentage is calculated as (dropped packets / total packets) * 100, which is (500/1000)*100 = 50%. Therefore, option C is correct.
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.
✗
75%
Why it's wrong here
Incorrect calculation.
✗
25%
Why it's wrong here
Incorrect calculation.
✓
50%
Why this is correct
Half of the packets exceed the police rate and are dropped.
Related concept
Read the scenario before looking for a memorised answer.
✗
100%
Why it's wrong here
Not all packets are dropped; some conform.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the ability to correctly compute a percentage from raw drop and total counts, where candidates might misread the exhibit or confuse drop rate with success rate, leading to incorrect answers like 25% or 75%.
Detailed technical explanation
How to think about this question
ARP packet drops can occur due to rate limiting configured via the 'ip arp rate-limit' command on Cisco switches, which limits the number of ARP packets processed per second to prevent ARP flooding attacks. The drop rate percentage is a simple ratio of dropped to total ARP packets, often monitored using 'show ip arp inspection statistics' or 'show interface' counters in environments with Dynamic ARP Inspection (DAI) enabled.
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.
TExam Day Tips
→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 350-601 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 50% — The exhibit shows that out of 1000 total ARP packets, 500 were dropped. The drop rate percentage is calculated as (dropped packets / total packets) * 100, which is (500/1000)*100 = 50%. Therefore, option C is correct.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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