Can anyone explain this line to me?

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C++

TCP/IP

In this task, I sent a large file (2 MB) from the source node to the destination node through an intermediate node. n0 > n1 > n2; the data rate
in each communication channel is set to 10 Mb/s with a delay of 10 ms on each packet. and after I set the data buffer to 256B, the results is like lines below. could anyone explain what happens exactly?
Also If you explain what these terms are, I would appreciate. (SYN, ACK, FIN, Seq, Win, Len) :

1 0.000000 10.1.3.1 -> 10.1.2.2 TCP 42 49153 > 50000 [SYN] Seq=0 Win=65535 Len=0
2 0.040134 10.1.2.2 -> 10.1.3.1 TCP 42 50000 > 49153 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0
3 0.040134 10.1.3.1 -> 10.1.2.2 TCP 42 49153 > 50000 [ACK] Seq=1 Ack=1 Win=65535 Len=0
4 0.040167 10.1.3.1 -> 10.1.2.2 TCP 298 49153 > 50000 [FIN, ACK] Seq=1 Ack=1 Win=65535 Len=256
5 0.080711 10.1.2.2 -> 10.1.3.1 TCP 42 50000 > 49153 [ACK] Seq=1 Ack=1 Win=65535 Len=0
6 0.080745 10.1.2.2 -> 10.1.3.1 TCP 42 50000 > 49153 [FIN, ACK] Seq=1 Ack=1 Win=65535 Len=0
7 0.080745 10.1.3.1 -> 10.1.2.2 TCP 42 49153 > 50000 [ACK] Seq=1 Ack=1 Win=65535 Len=0