First question it really say without time and an example

1. (2) Imagine that a two-way handshake rather than a three-way handshake were used to set up TCP connections. In other words, the third message was not required. Without timers, deadlocks are now possible. Give an example. 2. (1) Where is datagram fragmentation and reassembly handled? By IP or TCP? Why does this make sense? 3. (1) Why is the maximum TCP segment 65515 bytes? 4. (2) Examine IP format and UDP format. Why is UDP needed if a user is only intcrested in sending datagrams