- A
Message (msg) option
Why wrong: The msg is an optional rule body option, not part of the header.
- B
Action (e.g., alert, drop)
The action is mandatory in the header to define what to do when a match occurs.
- C
Signature ID (sid) option
Why wrong: The sid is a required option in the rule body, but not part of the header.
- D
Direction operator (e.g., ->, <>)
The direction operator is mandatory in the header to indicate traffic flow.
- E
Protocol (e.g., tcp, udp, icmp)
The protocol is required in the header to specify which IP protocol to inspect.
Question 328 of 1,000
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. 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 security analyst is configuring Snort IDS rules. Which TWO components are mandatory in a Snort rule header?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Action (e.g., alert, drop)
In Snort, the rule header must include the action (e.g., alert, drop, reject), protocol (e.g., tcp, udp, icmp), source/destination IPs and ports, and the direction operator (-> or <>). The direction operator is mandatory because it defines the flow of traffic between source and destination, without which the rule cannot be parsed. Options like msg and sid are part of the rule body (options), not the header, and are optional.
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.
- ✗
Message (msg) option
Why it's wrong here
The msg is an optional rule body option, not part of the header.
- ✓
Action (e.g., alert, drop)
Why this is correct
The action is mandatory in the header to define what to do when a match occurs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Signature ID (sid) option
Why it's wrong here
The sid is a required option in the rule body, but not part of the header.
- ✓
Direction operator (e.g., ->, <>)
Why this is correct
The direction operator is mandatory in the header to indicate traffic flow.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Protocol (e.g., tcp, udp, icmp)
Why this is correct
The protocol is required in the header to specify which IP protocol to inspect.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between mandatory header components and optional rule body options, so candidates mistakenly select 'msg' or 'sid' as mandatory because they are commonly seen in every rule, but they are not part of the header.
Detailed technical explanation
How to think about this question
Snort rules are parsed in two distinct parts: the header and the options. The header format is strictly: [action] [protocol] [source IP] [source port] [direction] [destination IP] [destination port]; omitting any of these fields (except IP/port when using 'any') causes a parse error. The direction operator '->' is unidirectional, while '<>' is bidirectional; using '<>' is common for analyzing both directions of traffic (e.g., in a network tap). In real-world deployments, forgetting the direction operator is a frequent syntax error that prevents the rule from loading.
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 200-201 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.
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FAQ
Questions learners often ask
What does this 200-201 question test?
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Action (e.g., alert, drop) — In Snort, the rule header must include the action (e.g., alert, drop, reject), protocol (e.g., tcp, udp, icmp), source/destination IPs and ports, and the direction operator (-> or <>). The direction operator is mandatory because it defines the flow of traffic between source and destination, without which the rule cannot be parsed. Options like msg and sid are part of the rule body (options), not the header, and are optional.
What should I do if I get this 200-201 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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Last reviewed: Jul 4, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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