What is the primary purpose of the Iperf tool?

To measure the maximum achievable throughput between two hosts on a network

To measure the latency of a single packet

To test internet download and upload speeds to a public server

To configure network interfaces on a router

An ISP advertises a plan with 1 Gbps download speed. A customer runs a speed test and gets 940 Mbps. The customer complains that they are not getting the advertised speed. Which response is most accurate?

The speed test measures throughput, which is typically lower than the advertised bandwidth due to protocol overhead and other factors.

The customer's router is limiting the speed, so they need to upgrade it.

The speed test is inaccurate because it measures upload speed instead of download speed.

The ISP is not delivering the contracted bandwidth, so the customer should file a complaint.

A network engineer is using Iperf to test throughput between two hosts across a WAN link with 100 Mbps bandwidth and 50 ms latency. The Iperf TCP test reports 40 Mbps. The engineer suspects the TCP window size is too small. What should the engineer do to confirm this?

Run Iperf with a larger TCP window size and see if throughput improves.

Increase the number of parallel Iperf streams to see if throughput improves.

Run Iperf with UDP traffic to measure the raw link throughput.

Check the link utilization on the routers to see if the link is congested.

An administrator uses Iperf to test throughput between two hosts on a 1 Gbps switch. The test shows 700 Mbps. The administrator suspects network congestion. What is the best next step to confirm congestion is the cause?

Check the switch's error counters for CRC errors.

Use a longer test duration to average out the results.

Increase the TCP window size on the Iperf test to see if throughput improves.

Run the Iperf test again during off-peak hours and compare the results.

A network administrator is investigating why a 1 Gbps link is only achieving 700 Mbps throughput. The administrator checks the link and finds no errors or congestion. What is the most likely remaining cause?

Protocol overhead from TCP/IP headers and framing is consuming part of the bandwidth.

Latency is high, which directly reduces throughput.

The hosts are using half-duplex mode, which halves the throughput.

The link's bandwidth is actually 700 Mbps, not 1 Gbps.

CiscoCertified Support Technician (CCST) Networking

Domain 1Objective 2

1.2. Differentiate Between Bandwidth and Throughput. 100-150 Practice Questions (Page 1)

Part of the Standards and Concepts domain, which makes up ~22% of our current practice bank. Cisco does not publish an official question count, but from its 50-minute exam (~20–35 total, ~4–8 in this domain), expect 1–2 from this objective — we provide 41 practice questions to prepare you well beyond it. (estimate)

41questions here

9free pages

5concepts

Questions 1–5

1foundation · easy
What is the primary purpose of the Iperf tool?
Select an answer first
2application · medium
An ISP advertises a plan with 1 Gbps download speed. A customer runs a speed test and gets 940 Mbps. The customer complains that they are not getting the advertised speed. Which response is most accurate?
Select an answer first
3expert · hard
A network engineer is using Iperf to test throughput between two hosts across a WAN link with 100 Mbps bandwidth and 50 ms latency. The Iperf TCP test reports 40 Mbps. The engineer suspects the TCP window size is too small. What should the engineer do to confirm this?
Select an answer first
4application · medium
An administrator uses Iperf to test throughput between two hosts on a 1 Gbps switch. The test shows 700 Mbps. The administrator suspects network congestion. What is the best next step to confirm congestion is the cause?
Select an answer first
5application · medium
A network administrator is investigating why a 1 Gbps link is only achieving 700 Mbps throughput. The administrator checks the link and finds no errors or congestion. What is the most likely remaining cause?
Select an answer first

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