How does active sniffing work in a switched network environment?

How does active sniffing work in a switched network environment?

• A. By capturing traffic through passive monitoring
• B. By flooding the Content Addressable Memory (CAM) table
• C. By employing encryption on all traffic
• D. By utilizing firewalls to block access

Answer: (B)

Active sniffing in a switched network environment primarily involves flooding the Content Addressable Memory (CAM) table of a switch. When this technique is employed, the attacker sends a large number of frames with different MAC addresses to the switch. This causes the CAM table to fill up quickly. Once the table is full, the switch can no longer efficiently determine where to send packets based on MAC addresses. Consequently, it begins to operate in a fail-open mode, broadcasting packets to all ports instead of just the intended destination. By doing so, the attacker can intercept and inspect the traffic intended for other devices on the network, allowing access to sensitive information that would otherwise be protected by the switch's ability to isolate traffic. This method differs from passive monitoring, which typically relies on observing network traffic without actively participating in the traffic flow. Encryption and firewall measures are preventive strategies that would mitigate such attacks, but they do not facilitate the active sniffing process itself.

Active sniffing in a switched network environment primarily involves flooding the Content Addressable Memory (CAM) table of a switch. When this technique is employed, the attacker sends a large number of frames with different MAC addresses to the switch. This causes the CAM table to fill up quickly. Once the table is full, the switch can no longer efficiently determine where to send packets based on MAC addresses. Consequently, it begins to operate in a fail-open mode, broadcasting packets to all ports instead of just the intended destination.

By doing so, the attacker can intercept and inspect the traffic intended for other devices on the network, allowing access to sensitive information that would otherwise be protected by the switch's ability to isolate traffic. This method differs from passive monitoring, which typically relies on observing network traffic without actively participating in the traffic flow. Encryption and firewall measures are preventive strategies that would mitigate such attacks, but they do not facilitate the active sniffing process itself.