Interview Q&A / Computer Networks
Computer Networks interview questions
What happens when you open a website, TCP vs UDP, DNS and HTTP.
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- Why does TCP use a three-way handshake, and why not two?
The handshake lets both sides agree on starting sequence numbers and confirm that each can send and receive. Two steps would prove only that the server can hear the client, so a delayed old SYN could make the server open a connection nobody wants.
BeginnerQuick answer1 min read