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with TCP port 53 and UDP port 53 are distinct sockets, while IP does not have ports.
* A socket that has been connected to another socket, e.g., during the establishment of a TCP connection, also has a remote socket address.

Definition

The distinctions between a socket (internal representation), socket descriptor (abstract identifier), and socket address (public address) are subtle, and these are not always distinguished in everyday usage. Further, specific definitions of a socket differ between authors. In IETF

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