What is likely occurring if you observe hundreds of half-open TCP connections on a router's external interface?

What is likely occurring if you observe hundreds of half-open TCP connections on a router's external interface?

• A. Network Congestion
• B. TCP SYN Flood Attack
• C. Denial of Service Attack
• D. Malware Infection

Answer: (B)

Observing hundreds of half-open TCP connections on a router's external interface is typically indicative of a TCP SYN Flood Attack. In this type of attack, an attacker sends a large number of connection requests (SYN packets) to overwhelm a target device or network with a flood of half-open connections. When a TCP connection is initiated, the server acknowledges the receipt of the SYN packet by sending back a SYN-ACK packet. However, if the attacker does not complete the connection (by sending the final ACK), the server holds resources for each incoming request, resulting in many half-open connections. This condition leads to a depletion of available connection slots on the target, effectively slowing down or halting legitimate traffic, as the server may become unable to process new connection requests. While network congestion and denial of service attacks can result in similar observations, the prevalence of half-open connections directly aligns with the behavior exhibited in a TCP SYN Flood scenario. This makes it a definitive indication of an attack specifically designed to exploit the TCP handshake process.

Observing hundreds of half-open TCP connections on a router's external interface is typically indicative of a TCP SYN Flood Attack. In this type of attack, an attacker sends a large number of connection requests (SYN packets) to overwhelm a target device or network with a flood of half-open connections. When a TCP connection is initiated, the server acknowledges the receipt of the SYN packet by sending back a SYN-ACK packet. However, if the attacker does not complete the connection (by sending the final ACK), the server holds resources for each incoming request, resulting in many half-open connections.

This condition leads to a depletion of available connection slots on the target, effectively slowing down or halting legitimate traffic, as the server may become unable to process new connection requests. While network congestion and denial of service attacks can result in similar observations, the prevalence of half-open connections directly aligns with the behavior exhibited in a TCP SYN Flood scenario. This makes it a definitive indication of an attack specifically designed to exploit the TCP handshake process.