Note: This is certainly not the answer, I just spent too long thinking about it so I felt like posting it
It bothered me that the hint was nested in a code block as well as a quote block but it was irrelevant to the answer, so I integrated it into mine.
Client Side TCP Three-Way Handshake Initiation
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The TCP Three-Way handshake is the way a client opens a connection with a server in the internet world. The client sends a SYN packet, the server acknowledges with an ACK, then the client sends a SYN-ACK, at which point the connection is complete.
P&P - The two packets the client will send out during this handshake, SYN and SYN-ACK
capP&Psule - The packets are in the word capsule - in order to send packets they must be encapsulted (in=en/capsule=capsulated)
Quote Block - This process is sometimes called a conversation between the client and the server, the quote block denotes that this is what the client is saying in the conversation.
Code block - The encapsulated packets are what the client is saying, the client is a computer, computers communicate in code. Hence, what is in the quote block must be put in a code block.