CCNA Security - IP Spoofing (no blind)

When we are talking about communication between two devices we refer to a sender and a receiver. In TCP communication we have the three-way handshake between these two devices before we establish a communication. The sender sends the SYN package to the receiver, then the receiver sends back the SYN/ACK package and then the sender sends the ACK package back to the receiver. This is called the three-way handshake communication. In the IP Spoofing attack we have the three-way handshake communication between two devices but on the last step the attacker who is on the same network with the sender and receiver, predicts the TCP sequence number and responses as if he was the sender. After that the receiver trust the attacker who has the same Layer 3 address but different Layer 2 address from the real sender.