100-890 practice question 13 of 15

Which command is less technical for "latency"?

Full set: 60 questions
Answer options
A: nslookup
B: ping Correct answer
C: netstat -a
D: traceroute
Correct Answer:
B. ping
Explanation

The ping command is a fundamental network utility used to test the reachability of a host on an IP network. It measures the round-trip time (RTT) for messages sent from the originating host to a destination computer, which is a direct and simple measurement of latency. Its output is straightforward, typically showing a single time value per packet, making it a common first-step diagnostic tool and conceptually less technical than utilities that provide more detailed path analysis.

Why Incorrect

A. nslookup is used for querying the Domain Name System (DNS) to obtain domain name or IP address mapping information, not for measuring network path latency.
C. netstat -a displays all active network connections, listening ports, and other statistics on a local machine; it does not measure latency to a remote host.
D. traceroute provides a detailed, hop-by-hop analysis of the path and latency to each router along the way, making it a more complex and technically detailed tool than ping.

References

1. Cisco Systems, Inc. (2017). IP SLAs Command Reference, Cisco IOS XE Gibraltar 16.7.x. "ICMP Echo Operation" section. This document describes the ICMP Echo operation, the mechanism underlying the ping command, as a method to "measure end-to-end response time" between devices, highlighting its function as a direct latency measurement tool.

2. Doyle, J., & Carroll, J. (2014). Troubleshooting and Maintaining Cisco IP Networks (TSHOOT) Foundation Learning Guide. Cisco Press. Chapter 2, "Network Maintenance and Troubleshooting Tools," pp. 35-38. The guide describes ping as the "most basic IP-level connectivity test" for verifying RTT, while traceroute is presented as a more advanced tool for identifying the specific path and points of delay.

3. Saltzer, J. H., & Kaashoek, M. F. (2009). Principles of Computer System Design: An Introduction. Morgan Kaufmann. Chapter 9, "Networking," Section 9.4.3, "Tools of the trade: ping and traceroute," p. 436. The text explains that ping sends a single packet to a destination to see if it is reachable and measure the round-trip time, while traceroute is used for the more complex task of discovering the network path.

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