The answer is iperf, which is the correct tool to measure network throughput and latency between EC2 instances in different Availability Zones. Unlike ping, which only measures round-trip time, or traceroute, which maps the path without quantifying performance, iperf actively generates TCP or UDP traffic to report precise throughput and jitter, making it essential for isolating high-latency issues caused by bandwidth constraints or bufferbloat. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your ability to distinguish between diagnostic tools for network performance versus connectivity or path discovery. A common trap is choosing ping because it’s familiar, but ping cannot measure throughput—a critical metric when troubleshooting inter-AZ latency. Remember the mnemonic: “Ping shows if you’re alive, iperf shows how you drive.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 needs to troubleshoot high latency between two EC2 instances in the same VPC but in different Availability Zones. Which tool should be used to measure network performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use iperf to measure throughput and latency
Option A is correct because iperf is a common tool for measuring network throughput and latency. Option B is wrong because traceroute shows the path but not detailed performance. Option C is wrong because netstat shows connections and statistics but not active measurements. Option D is wrong because ping measures round-trip time but not throughput.
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.
✗
Use traceroute to identify the path
Why it's wrong here
Traceroute shows the route but does not measure latency or throughput accurately.
✗
Use ping to test connectivity
Why it's wrong here
Ping tests connectivity and RTT but not throughput or detailed latency.
✓
Use iperf to measure throughput and latency
Why this is correct
iperf is designed for active network performance measurement.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use netstat to check network statistics
Why it's wrong here
Netstat shows current network connections and statistics, not active performance.
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.
Trap categories for this question
Command / output trap
Traceroute shows the route but does not measure latency or throughput accurately.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 ANS-C01 NAT questions on configuration and troubleshooting.
Network Management and Operations — This question tests Network Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use iperf to measure throughput and latency — Option A is correct because iperf is a common tool for measuring network throughput and latency. Option B is wrong because traceroute shows the path but not detailed performance. Option C is wrong because netstat shows connections and statistics but not active measurements. Option D is wrong because ping measures round-trip time but not throughput.
What should I do if I get this ANS-C01 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 ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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