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200-201 Practice Question: Which TWO network behaviors suggest an ARP…
Which TWO network behaviors suggest an ARP spoofing attack is occurring? (Choose two.)
⚠ Common exam trap
Cisco often tests the distinction between normal ARP traffic (e.g., broadcasts for resolution) and malicious ARP behavior (e.g., multiple IPs on one MAC or MAC-IP mismatches), so candidates mistakenly choose high ARP volume or TCP RSTs as spoofing indicators.
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
✓
Packets originating from a MAC address that does not match the IP's legitimate MAC
In an ARP spoofing attack, the attacker sends forged ARP replies that associate their own MAC address with the IP address of a legitimate host (e.g., the default gateway). This causes packets destined for that IP to be sent to the attacker's MAC, creating a mismatch between the source MAC in the packet and the legitimate MAC address for that IP. Detecting such mismatches is a key indicator of ARP cache poisoning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A high number of TCP RST packets
Why it's wrong here
Not directly related to ARP spoofing.
- ✗
A single host sending numerous ARP requests
Why it's wrong here
Could be scanning, not necessarily spoofing.
- ✓
Packets originating from a MAC address that does not match the IP's legitimate MAC
Why this is correct
Indicates the attacker is sending packets with a spoofed MAC.
- ✗
An increase in broadcast ARP traffic
Why it's wrong here
Can be normal or scanning.
- ✓
Multiple IP addresses mapping to the same MAC address
Why this is correct
The attacker uses one MAC to impersonate multiple IPs.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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