please explain with illustration

The network performance of a multimedia network is heavily influenced by several key factors such as bandwidth, channel condition and quality demand and hence affects its Quality of Services (QoS). For example, Apple's FaceTime communications demands real time video delivery while Apple's mail application requires reliable delivery. (a) Explain with illustration, what is the TCP network principle behind the handshaking between any internet web browser and bank server. Hence, appraise the importance and the need for this TCP handshake. (8 marks)