The primary goal of a MAC flooding attack is to force the switch to act like a hub and allow packet sniffing. This works by overwhelming the switch’s Content Addressable Memory (CAM) table with thousands of fake source MAC addresses, causing it to fail open and flood all incoming frames out every port. Once the switch behaves like a hub, the attacker can capture traffic that would normally be isolated to specific ports, bypassing the switch’s segmentation. On the Systems Security Certified Practitioner (SSCP) exam, this question tests your understanding of Layer 2 attacks and the switch’s operational failure mode. A common trap is confusing MAC flooding with ARP spoofing—remember that flooding targets the CAM table size, not the ARP cache. For a quick memory tip: think “Flood the table, sniff the cable.”
SSCP Network and Communications Security Practice Question
This SSCP practice question tests your understanding of network and communications security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 organization detects that an attacker is performing a MAC flooding attack on a switch. What is the primary goal of this attack?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To force the switch to act like a hub and allow packet sniffing
MAC flooding attacks exploit the limited size of a switch's Content Addressable Memory (CAM) table. By sending thousands of fake source MAC addresses, the attacker fills the CAM table, causing the switch to fail open and flood all incoming frames out all ports, effectively behaving like a hub. This allows the attacker to sniff traffic that would normally be isolated to specific switch ports.
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.
✗
To change the MAC address of the switch
Why it's wrong here
The attack does not change switch MAC addresses.
✗
To cause a denial of service on the network
Why it's wrong here
While flooding may cause performance issues, the primary goal is traffic interception.
✓
To force the switch to act like a hub and allow packet sniffing
Why this is correct
Filling the CAM table causes the switch to flood frames out all ports.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
To bypass 802.1X authentication
Why it's wrong here
MAC flooding does not bypass authentication mechanisms.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the primary goal of MAC flooding (sniffing traffic) with a denial of service, but Cisco tests that the attacker's intent is to bypass port-level isolation to eavesdrop, not simply to crash the switch.
Detailed technical explanation
How to think about this question
Under the hood, a switch's CAM table typically holds tens of thousands of entries (e.g., 8,000 to 32,000). Once flooded, the switch enters a 'fail-open' state where it broadcasts all unknown unicast frames, enabling an attacker connected to any port to capture traffic using a packet sniffer like Wireshark. In real-world scenarios, this attack is often mitigated by port security features that limit the number of MAC addresses per port (e.g., 'switchport port-security maximum 1') or by using dynamic ARP inspection (DAI) to validate MAC-to-IP bindings.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: To force the switch to act like a hub and allow packet sniffing — MAC flooding attacks exploit the limited size of a switch's Content Addressable Memory (CAM) table. By sending thousands of fake source MAC addresses, the attacker fills the CAM table, causing the switch to fail open and flood all incoming frames out all ports, effectively behaving like a hub. This allows the attacker to sniff traffic that would normally be isolated to specific switch ports.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SSCP 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 SSCP exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.