Connectionless demux: example DatagramSocket mySocket$2$

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new DatagramSocket $(9157)$ ; DatagramSocket serverSocket

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new DatagramSocket $(6428)$; DatagramSocket mySocket $1=$ new DatagramSocket Transport Layer $3-11$ In the diagram above, What is the source port in the segment going from P$1$ to P$4?$ What is the source port in the segment going from P$4$ to P$1?$ What is the destination port in the segment going from P$1$ to P$4?$ What is the destination port in the segment going from P$4$ to P$1?$