ISC2 CC Network Security Practice Question
A security analyst is deploying network security devices. Which TWO of the following are characteristics of an Intrusion Detection System (IDS)?
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
✓
Operates in passive mode by monitoring a copy of traffic
IDS is passive, monitors traffic, and generates alerts but does not block traffic. It can be network-based or host-based.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Can be placed inline to block malicious traffic
Why it's wrong here
Blocking is a function of IPS, not IDS.
- ✓
Operates in passive mode by monitoring a copy of traffic
Why this is correct
IDS typically uses a SPAN port or tap to monitor traffic passively.
- ✗
Can automatically reconfigure firewall rules
Why it's wrong here
That is a feature of some IPS or SOAR systems.
- ✗
Ensures zero false positives
Why it's wrong here
No detection system guarantees zero false positives.
- ✓
Generates alerts when suspicious activity is detected
Why this is correct
IDS alerts but does not take action.
Go deeper
Related to this question
Learn chapter
Introduction to Security Principles
Key term
IDS
An IDS is a security system that monitors network or system traffic for suspicious activity and alerts administrators to potential threats, but does not actively block them.
Key term
Denial-of-service
A Denial-of-service (DoS) attack is an attempt to make a computer, network, or online service unavailable to its intended users by overwhelming it with fake traffic or requests.
About these practice questions
This CC question is part of Courseiva's 976-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 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 CC exam.