6. (10 points) A 3200 bit long TCP message is transmitted to the IP layer and becomes a datagram after adding a 160 bit header. The following Internet is connected by two LANs through routers. But the data part of the longest data frame that the second LAN can transmit is only 1200 bits. Therefore, datagrams must be segmented in the router. How many bits of data does the second LAN transmit to its upper layer? Your solution