题目内容

DNS uses TCP as tranport layer protocol

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All TCP connections are full-duplex and point-to-point

Port numbers below 2048 are called well-known ports and are reserved for standard services.

Each socket has a number (address) consisting of the IP address of the host and a 32-bit number local to that host, called port.

TCP service is obtained by having both the sender and receiver create end points, called sockets.