Quick Answer
The correct answer is that the `-i 0.2` option sets the interval between ICMP Echo Request packets to 0.2 seconds. This is the primary purpose of the `-i` flag in the ping command: it controls the delay between successive pings, overriding the default interval of one second. By specifying a shorter interval, the administrator can send packets more rapidly, compressing a 100-packet test into roughly 20 seconds instead of over a minute and a half, which is essential for catching transient packet loss during a brief troubleshooting window. On the Linux Foundation Certified System Administrator LFCS exam, this question tests your understanding of network diagnostic tools and their practical tuning parameters; a common trap is confusing `-i` with the packet size option `-s` or the count option `-c`. Remember the memory tip: "i" stands for "interval" — think of it as the time between each ping's heartbeat.
This LFCS practice question tests your understanding of networking. 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.
An administrator is troubleshooting intermittent connectivity issues. Running 'ping -c 100 -i 0.2 10.0.0.1' shows about 5% packet loss. What is the primary purpose of the '-i 0.2' option?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
It sets the TTL to 0.2
Why wrong: TTL is an integer, not a fraction; set with -t.
It sets the timeout to 0.2 seconds
Why wrong: Timeout is set with -W.
It sets the packet size to 0.2 bytes
Why wrong: Packet size is set with -s.
It sets the interval between pings to 0.2 seconds
This speeds up the test to detect intermittent loss.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It sets the interval between pings to 0.2 seconds
The '-i 0.2' option in the ping command sets the interval between sending ICMP Echo Request packets to 0.2 seconds. This allows the administrator to send pings more frequently than the default (typically 1 second), which helps in detecting intermittent connectivity issues over a shorter test duration. By sending 100 packets at a 0.2-second interval, the test completes in about 20 seconds, making it practical for troubleshooting transient packet loss.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
It sets the TTL to 0.2
Why it's wrong here
TTL is an integer, not a fraction; set with -t.
It sets the timeout to 0.2 seconds
Why it's wrong here
Timeout is set with -W.
It sets the packet size to 0.2 bytes
Why it's wrong here
Packet size is set with -s.
It sets the interval between pings to 0.2 seconds
Why this is correct
This speeds up the test to detect intermittent loss.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse '-i' with timeout or TTL options, mistakenly thinking it controls how long to wait for a reply rather than the spacing between packet transmissions.
Detailed technical explanation
Under the hood, ping uses ICMP Echo Request/Reply (RFC 792) and the interval option (-i) controls the delay between successive transmissions using usleep() or nanosleep() system calls. On Linux, a non-root user cannot set an interval less than 0.2 seconds (200 ms) without superuser privileges, as this is a kernel-enforced restriction to prevent flooding. In real-world scenarios, a 0.2-second interval is useful for stress-testing a link's ability to handle rapid bursts of traffic, revealing bufferbloat or rate-limiting issues that a 1-second interval might miss.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS 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
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FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: It sets the interval between pings to 0.2 seconds — The '-i 0.2' option in the ping command sets the interval between sending ICMP Echo Request packets to 0.2 seconds. This allows the administrator to send pings more frequently than the default (typically 1 second), which helps in detecting intermittent connectivity issues over a shorter test duration. By sending 100 packets at a 0.2-second interval, the test completes in about 20 seconds, making it practical for troubleshooting transient packet loss.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
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