Guaranteed communication over TCP port 53 is the main difference between TCP and UDP. Only when a connection is set up user's data can be sent bi-directionally over the connection.Īttention! TCP guarantees delivery of data packets on port 53 in the same order in which they were sent. TCP is a connection-oriented protocol, it requires handshaking to set up end-to-end communications. TCP is one of the main protocols in TCP/IP networks. TCP port 53 uses the Transmission Control Protocol.
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